Code
P1315
BUICK
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 18
EN: 40
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
CADILLAC
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 22
EN: 58
RU: 26
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
CHEVROLET
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 19
EN: 45
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
CHRYSLER
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 25
EN: 52
RU: 34
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
DAEWOO
P — Powertrain
IG. COIL 2 - OVER OUTPUT
Views:
UK: 5
EN: 10
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
GEO
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 20
EN: 43
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P1315
GM
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 20
EN: 44
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P1315
GMC
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 20
EN: 49
RU: 29
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
HUMMER
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 9
EN: 19
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
JAGUAR
P — Powertrain
Persistent Misfire
Views:
UK: 19
EN: 42
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
LEXUS
P — Powertrain
Igniter Circuit Malfunction No 4
Views:
UK: 22
EN: 40
RU: 24
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
OLDSMOBILE
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 23
EN: 44
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
Other
P — Powertrain
Persistent Misfire
Views:
UK: 22
EN: 39
RU: 21
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1315
SATURN
P — Powertrain
Ignition Coil 4 Primary Feedback Circuit
Views:
UK: 19
EN: 42
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P1315
SCION
P — Powertrain
Igniter circuit malfunction cylinder 4
Views:
UK: 1
EN: 8
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (coil pack/module) for cylinder 4
- Open, short, or high-resistance wiring/connectors in coil 4 primary/ground/power circuit
- Poor or intermittent battery/ignition power to the coil
- Corroded or loose connector pins or terminals
- PCM/ECM fault or damaged driver transistor
- Aftermarket ignition parts or improper coil replacement
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent rough running
- Single-cylinder misfire (cylinder 4) or multiple misfires
- Reduced power, hesitation or surging under load
- Increased fuel consumption and failed emissions test
- Possible starting difficulty if fault is persistent
What to check
- Read freeze frame and temporary/in-use data with a capable scan tool; note battery voltage and engine RPM when DTC set
- Check for related codes (misfire codes P0304, P0300, and other coil circuit codes P035x)
- Visual inspection of coil 4, connector, wiring harness, and nearby components for damage, corrosion, oil, or coolant contamination
- Verify battery voltage at ignition on and during cranking (should be close to battery voltage)
- Inspect and gently wiggle wiring and connectors while monitoring live data for intermittent changes
- Measure coil primary resistance and compare to manufacturer specification
Signal parameters
- Coil primary resistance (typical range): ~0.3–2.0 ohms (varies by coil design) — consult specific service data
- Coil secondary resistance (typical range): ~6k–20k ohms (varies) — consult service data
- Power feed: battery voltage (~11.5–14.5 V) present at coil power terminal with ignition on/cranking
- Control/switch signal: PCM switches ground or +12 V (depending on design) — expected pulsed switching waveform (0 V to battery voltage) during operation
- Dwell time: typically a few milliseconds (varies with RPM/load) — abnormal or absent pulses indicate fault
- No open-circuit (infinite ohms) or hard short to battery/ground on signal or primary feed
Diagnostic algorithm
- Connect a scan tool, confirm P1315 and any related codes. Note freeze frame and live data (RPM, voltage, misfire counts).
- Perform a careful visual inspection of coil 4, connector, and harness for damage, oil or moisture contamination, bent pins, or corrosion.
- Verify battery voltage at the coil power terminal with ignition ON and while cranking. Low battery or poor power feed can set the code.
- With ignition OFF, disconnect coil 4 and check primary winding resistance between the coil’s primary terminals and secondary resistance per service spec. Replace coil if out of range.
- Backprobe coil connector while cranking (or use oscilloscope) to observe the primary switching waveform: verify proper pulses, amplitude and dwell. No pulses or abnormal waveform indicates wiring or PCM driver issue.
- Check continuity between the coil signal terminal and the PCM pin. Look for opens, shorts to voltage/ground, or high resistance. Repair damaged wires/connectors.
- Perform a wiggle test on wiring/connector while monitoring live data for intermittent faults.
- Swap coil 4 with another known-good coil (same type) and clear codes. If code follows the coil, replace the coil. If code stays on cylinder 4, suspect wiring or PCM.
- If wiring and coil test good but fault persists, inspect PCM connector and grounds. As a last step, consider PCM testing/replacement following manufacturer procedure.
- After repairs, clear codes and perform a full drive cycle to confirm the fault does not return.
Likely causes
- Failed ignition coil on cylinder 4
- Damaged or disconnected harness at coil connector
- High resistance in power feed or ground to the coil
- Shorted signal wire to battery or ground
- Corroded terminal or poor contact at coil connector
Fault status
Status
Ignition Coil 4 Primary Feedback Circuit — PCM detected abnormal or missing primary coil signal for cylinder 4. Inspect coil 4, its power/ground/signal wiring and connectors; verify coil and PCM operation.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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