Code
P0204
Generic
P — Powertrain
Cylinder 4 Injector A Circuit
Views:
UK: 17
EN: 43
RU: 58
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Workshop ManualYour experience will help others
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Code
P0204
GWM
P — Powertrain
- Injector malfunction - cylinder 4
Views:
UK: 1
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P0204
HUMMER
P — Powertrain
Injector 4 Control Circuit
Views:
UK: 6
EN: 16
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P0204
ISUZU
P — Powertrain
Injector Circuit - Cylinder 4
Views:
UK: 11
EN: 33
RU: 27
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
P0204
LAND ROVER
P — Powertrain
Cylinder with defect in injector circuit 4
Views:
UK: 3
EN: 12
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
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Code
P0204
MITSUBISHI
P — Powertrain
No.4 injector system
Views:
UK: 6
EN: 20
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between injector and PCM (power or ground)
- Corroded, loose or damaged injector connector or pins
- Failed fuel injector (coil open or shorted)
- Blown fuse or faulty fuel injector relay (power feed type)
- Poor or missing ground at engine wiring harness
- PCM/ECM driver circuit fault
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration, especially at low RPM
- Single-cylinder misfire (may show P0304)
- Hard starting or extended cranking
- Reduced power, poor acceleration
- Increased fuel consumption or black smoke from exhaust
What to check
- Read freeze-frame and pending codes; record live data/PIDs for injector status and misfires.
- Visual inspection of injector connector, pins and harness for corrosion, bent pins, heat damage or water intrusion.
- Check relevant fuses and fuel/injector power relay (if injectors use an ignition-switched or fused feed).
- With connector disconnected, measure injector coil resistance at the injector pins (compare to manufacturer spec).
- With key ON (engine OFF) measure supply voltage to the injector power pin (should be near battery voltage if powered).
- Backprobe injector signal while cranking/starting to confirm driver pulses or use an oscilloscope to view waveform.
Signal parameters
- Injector coil resistance: typical range depends on design—low-impedance types ~1-3 Ω, high-impedance types ~12-16 Ω. Consult OEM spec.
- Standby supply voltage (injector + battery feed) with key ON: ~12–14.5 V.
- Driver output (low-side drivers): pulse switching between ~0 V and near battery voltage; energized state typically near 0 V for low-side drivers.
- Injector pulse width: typically 1–10 ms depending on load/RPM (varies by engine load).
- Pulse frequency increases with engine RPM; waveform should be repeatable and square-like on a lab scope.
Diagnostic algorithm
- Confirm the code with a scan tool and note freeze-frame and any related codes (misfires, low battery, CAN errors).
- Visually inspect the cylinder 4 injector connector, wiring, and nearby harness for damage, corrosion, or pin backout.
- Check fuses/relay for the injector feed circuit and verify injector power feed at the connector with key ON.
- Measure injector coil resistance at the connector (engine OFF); compare to spec. Replace injector if out of range or open.
- Backprobe the injector while cranking or running and use a DVOM or preferably an oscilloscope to confirm injector pulses and waveform shape.
- Check for short to power/ground: with connector disconnected measure resistance from the injector signal pin to chassis ground and to battery + with ignition OFF.
- Perform continuity check from injector harness pin to PCM pin. Repair broken wires, damaged pins, or poor grounds as needed.
- Swap injector with a known-good cylinder injector (if identical) to determine if code follows the injector or stays on cylinder 4.
- If wiring and injectors test good and code persists on cylinder 4 only, suspect PCM driver fault and verify with manufacturer diagnostics before replacing PCM.
- After repair, clear codes and perform functional test/road test to confirm the fault is resolved. Re-scan to ensure no new related codes.
Likely causes
- Corroded or loose injector connector at cylinder 4
- Broken or shorted wire in the harness (pinched/chafed near the cylinder or firewall)
- Failed injector coil on cylinder 4
- Bad ground or power feed to the injector circuit
- PCM/ECM driver failure (less common)
Fault status
Status
Cylinder 4 Injector A Circuit — electrical fault detected (open, short, high resistance or intermittent) in the injector circuit for cylinder 4. Check injector, connector, wiring and PCM driver.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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👎 Dislike
0
Send to email