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
Ignition Coil 1 Control Circuit	P0351	P0351	P0351
Ignition Coil 2 Control Circuit	P0352	P0352	P0352
Ignition Coil 3 Control Circuit	P0357	P0357	P0357
Ignition Coil 4 Control Circuit	P0353	P0353	P0353
Ignition Coil 5 Control Circuit	P0354	P0354	P0354
Ignition Coil 6 Control Circuit	P0355	P0355	P0355
Ignition Coil 7 Control Circuit	P0356	P0356	P0356
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:

Conditions for Running the DTC

Conditions for Setting the DTC

The ECM detects one of the following failures on the IC circuit for up to 6 seconds:

Action Taken When the DTC Sets

DTCs P0351-P0358 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0351-P0358 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

Important: Random misfires that are not steadily incrementing may be normal.

3. With a scan tool, observe the Misfire Current Cyl. parameters for cylinders 1-8. The parameters normally display 0 and should not be incrementing. Record any cylinder that has an incrementing parameter.
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

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

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

3. Test the IC circuit of any cylinder that was recorded with an incrementing Misfire Current Cyl. parameter for an open/high resistance, a short to ground, or a short to voltage.

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

4. Connect the ECM.
5. Exchange the suspect 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 the misfire transfers with the suspect ignition/coil module, replace as needed.

⇒	If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.

Repair Instructions

Repair Verification

Important: An ignition system misfire condition can 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 any components or connectors that have been 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 DTCs.
4. Turn OFF the ignition 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, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
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. Refer to DTC P0420.