DTC P0351 [LF, L3]

id0102008430a3

DTC P0351

Ignition coil No.1 circuit malfunction

DETECTION CONDITION

• The PCM monitors the output voltage to ignition coil No.1 when the engine is running. If the voltage is incorrect, the PCM determines that ignition coil circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles.
• The PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Connector or terminal malfunction
• Open circuit between PCM terminal 1A and ignition coil terminal C
• Short to power circuit between PCM terminal 1A and ignition coil terminal C
• Short to ground circuit between PCM terminal 1A and ignition coil terminal C
• Open circuit between ignition switch and ignition coil terminal B
• Ignition coil malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT IGNITION COIL CONNECTOR
• Turn the ignition switch to the OFF position.
• Disconnect the ignition coil connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminals, then go to Step 9.
No
Go to the next step.
3
INSPECT IGNITION COIL POWER SUPPLY CIRCUIT for an open circuit CIRCUIT
• Disconnect ignition coil connector.
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between ignition coil terminal B (harness-side) and body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 9.
4
INSPECT IGNITION COIL SIGNAL CIRCUIT FOR SHORT TO POWER
• Measure the voltage between ignition coil terminal C (harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a short to power, then go to Step 9.
No
Go to the next step.
5
INSPECT IGNITION COIL SIGNAL CIRCUIT FOR SHORT TO GROUND
• Check continuity between ignition coil terminal C (harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a short to ground, then go to Step 9.
No
Go to the next step.
6
INSPECT PCM CONNECTOR
• Turn the ignition switch to the OFF position.
• Disconnect the PCM connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminals, then go to Step 9.
No
Go to the next step.
7
INSPECT IGNITION COIL SIGNAL CIRCUIT for an open circuit CIRCUIT
• Check continuity between PCM terminal 1A (harness-side) and ignition coil terminal C (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 9.
8
INSPECT IGNITION COIL
• Inspect the ignition coil.
• Is the ignition coil normal?
Yes
Go to the next step.
No
Replace ignition coil, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0351 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch to the ON position (Engine off).
• Clear the DTC from memory using the WDS or equivalent.
• Perform the KOEO/KOER self-test.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.