DTC P0354


DTC P0354	Ignition coil No.4 control circuit malfunction
DETECTION CONDITION	• If the PCM detects abnormal voltage value when ignition coil No.4 is energized under the following monitoring conditions, the PCM determines that the ignition coil No.4 control circuit has a malfunction. MONITORING CONDITIONS - Engine speed is less than 3,000 rpm. - Battery voltage 9-16.5 V 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 or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • The PENDING CODE is available if PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Ignition coil malfunction • Connector or terminal malfunction • Open circuit between ignition coil No.4 terminal A and PCM terminal 2A • Open circuit between ignition coil No.4 terminal C and PCM terminal 2M • Short to power or ground between ignition coil No.4 terminal C and PCM terminal 2M • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2	INSPECT IGNITION COIL NO.4 FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the ignition coil connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
2		No	Go to the next step.
3	INSPECT IGNITION COIL FOR ELECTRICAL MALFUNCTION • Inspect the ignition coil No.4. (See IGNITION COIL INSPECTION [ZJ, ZY].) • Is ignition coil No.4 normal?	Yes	Go to the next step.
3		No	Replace ignition coil No.4, then go to Step 10.
4	INSPECT CONTROL CIRCUIT FOR SHORT TO POWER • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between following terminal and body ground: - Ignition coil No.4 terminal C (wiring harness-side) • Is the voltage B+?	Yes	Repair or replace the wiring harness, then go to Step 10.
4		No	Go to the next step.
5	INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between the following terminal and body ground: - Ignition coil No.4 terminal C (wiring harness-side) • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 10.
5		No	Go to the next step.
6	INSPECT PCM FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair the terminal, then go to Step 10.
6		No	Go to the next step.
7	INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: - Between ignition coil No.4 terminal C (wiring harness-side) and PCM terminal 2M (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness, then go to Step 10.
8	INSPECT POWER CIRCUIT MALFUNCTION FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: - Between ignition coil No.4 terminal A (wiring harness-side) and PCM terminal 2A (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness, then go to Step 10.
9	INSPECT GROUND CIRCUIT MALFUNCTION FOR OPEN CIRCUIT • Inspect for continuity between the following terminal: - Ignition coil No.4 terminal B (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0354 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the WDS or equivalent. • Perform KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE.)
11		No	Troubleshooting completed.