Diagnostic Instructions

DTC Descriptors

DTC P0351: Ignition Coil 1 Control Circuit

DTC P0352: Ignition Coil 2 Control Circuit

DTC P0353: Ignition Coil 3 Control Circuit

DTC P0354: Ignition Coil 4 Control Circuit

DTC P0355: Ignition Coil 5 Control Circuit

DTC P0356: Ignition Coil 6 Control Circuit

DTC P0357: Ignition Coil 7 Control Circuit

DTC P0358: Ignition Coil 8 Control Circuit

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition Coil 1 Control Circuit	P0351	P0351	P0351	--
Ignition Coil 2 Control Circuit	P0352	P0352	P0352	--
Ignition Coil 3 Control Circuit	P0353	P0353	P0353	--
Ignition Coil 4 Control Circuit	P0354	P0354	P0354	--
Ignition Coil 5 Control Circuit	P0355	P0355	P0355	--
Ignition Coil 6 Control Circuit	P0356	P0356	P0356	--
Ignition Coil 7 Control Circuit	P0357	P0357	P0357	--
Ignition Coil 8 Control Circuit	P0358	P0358	P0358	--

Circuit/System Description

The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the 8 individual ignition control (IC) circuits. When the ECM commands the IC circuit ON, electrical current will flow through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM will command the IC circuit OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary coil windings, producing a high voltage across the spark plug electrodes. The ECM uses information from the crankshaft position (CKP) sensor, and the camshaft position (CMP) sensor for sequencing and timing of the spark events. The ECM monitors each IC circuit for improper voltage levels. Each ignition module/coil assembly has the following electrical circuits attached:

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

DTC P0351-P0358 are type B DTCs.

Conditions for Clearing the DTC

DTC P0351-P0358 are type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

1. Start and run the engine.
2. With a scan tool, monitor for all eight ignition control (IC) ignition status parameters display OK.

⇒	If the IC circuit status parameter displays Short to Ground/Open, or Short to B+, continue with the Circuit/System Testing.

3. Observe the Misfire Current counters using the scan tool. The counters should not increase.

⇒	If the counters increase for any of the cylinders, continue with Circuit/System Testing.

4. If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle under the conditions observed from the Freeze Frame/Failure Records.

Circuit/System Testing

1. Turn the ignition OFF.
2. Disconnect the ECM.

Important: A high resistance on any IC circuit can cause a misfire before the DTC sets.

3. Test the affected IC circuit for the following.

•	Short to voltage

•	Short to ground

•	Open/High Resistance

⇒	If a condition is found, repair the circuit as needed.

4. Connect the ECM.
5. Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
6. Start the engine, and observe the scan tool.

⇒	If the DTC or misfire on the suspected ignition/coil module occurs, replace the ignition coil.

⇒	If the DTC occurs or misfire on the suspected ignition/coil module does not occur, replace the ECM.

Repair Instructions

Repair Verification

Important: An ignition system misfire condition may cause the 3-way catalytic converter to overheat under certain driving conditions.

If the customer concern was a flashing MIL, perform the following procedure:

1. Install components that were removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTC.
4. Turn the ignition OFF for 60 seconds.
5. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, to verify that the DTC does not reset. If the DTC resets or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedures.
6. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair Verification for DTC P0420 or P0430. Refer to DTC P0420 or P0430.