P1213
Start Injector Circuit Malfunction
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Fuel Injector 1 Circuit High Voltage
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Start Injector Circuit Malfunction
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Start Injector Circuit
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Start Injector Circuit Malfunction
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Start Injector Circuit Malfunction
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Fuel injector, cylinder 1
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Injector Cyl. 1, Control Module Output, Short To B+
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
Fault status
Similar codes
P1213
Cylinder 1 Fuel Injector Circuit Short To B+
Causes
- Open or shorted wiring in the start injector circuit
- Corroded, loose or damaged injector connector or terminals
- Failed start (auxiliary) injector
- Faulty injector driver in PCM/ECM
- Blown fuse, faulty relay, or loss of power to injector supply
- Poor or missing ground at injector or module
Symptoms
- Engine cranks but does not start or has extended cranking
- No injector activation during start sequence
- Reduced or inconsistent starting performance
- Possible stored DTC P1213 and related injector circuit codes
- Intermittent starting or one-time no-start condition
What to check
- Read freeze frame and related codes with a scan tool; note conditions when fault set
- Inspect wiring harness and connector for the start injector for corrosion, damage, pins pushed out or water intrusion
- Check fuses and relays that supply the injector circuit
- Backprobe injector connector and measure supply voltage (Key On, Engine Off and during cranking)
- Measure injector coil DC resistance and compare to vehicle service spec
- Check ground integrity for the injector and PCM grounds
Signal parameters
- Injector supply voltage: battery voltage (approx. 11–14.5 V) with key ON and during cranking; should be near battery voltage
- Injector coil DC resistance: consult service manual for exact spec; typical start/aux injectors are low-impedance (approx. 0.5–3 ohms) — verify against vehicle spec
- Control signal: PCM should provide a pulsed ground or switched voltage during cranking; pulse width and frequency vary by engine and condition — confirm with oscilloscope or scan tool
- No-voltage condition, short-to-ground or short-to-VB will be abnormal and indicate wiring or driver fault
Diagnostic algorithm
- Retrieve DTCs and freeze frame; record conditions (battery voltage, engine temp, crank time). Check for related codes (injector circuits, power/ground faults).
- Visually inspect the start injector connector and harness for damage, corrosion, or contaminated terminals. Repair or clean as needed.
- Verify power to the injector: with key ON, check for battery voltage at the injector supply terminal. Check related fuse(s) and relay(s).
- Verify ground: check continuity from injector ground terminal to chassis/PCM ground points. Repair poor grounds.
- Measure injector coil resistance (engine off, connector disconnected) and compare to spec. Replace injector if out of spec.
- Backprobe the control pin at the injector while cranking and monitor with a DVOM or oscilloscope to confirm PCM is commanding the injector (look for pulses).
- If no command from PCM but wiring and power/ground are good, check continuity between injector connector and PCM driver pin. If open or shorted, repair wiring.
- If wiring and connectors are good and PCM does not command the injector when it should, suspect PCM injector driver fault. Confirm by substituting a known-good injector driver (if serviceable) or consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform multiple crank/start cycles to verify fault does not return; road or start-test as required by procedure.
Likely causes
- Damaged/loose connector at the start injector
- Open or shorted wiring between injector and PCM
- Blown fuse or faulty relay supplying the injector
- Failed start injector
- PCM driver fault (less common)
