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

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Ignition Coil 1 Control Circuit	P0351	P0351	P0351	P0351	P0351
Ignition Coil 2 Control Circuit	P0352	P0352	P0352	P0352	P0352
Ignition Coil 3 Control Circuit	P0353	P0353	P0353	P0353	P0353
Ignition Coil 4 Control Circuit	P0354	P0354	P0354	P0354	P0354

Circuit/System Description

The ignition system uses individual ignition coil/module assemblies for each cylinder. The engine control module (ECM) controls the individual coils by transmitting timing pulses on the ignition control (IC) circuit of each ignition coil/module to enable a spark event. The ECM monitors each IC circuit for improper voltage levels. Each ignition coil/module has the following circuits:

Conditions for Running the DTC

Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the IC circuit or the ignition coil/module for less than 1 second.

Action Taken When the DTC Sets

DTCs P0351-P0354 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0351-P0354 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 idle the engine.
2. Observe the scan tool Misfire Current Cyl. parameters. This will indicate the affected ignition coil/modules, and if the condition is current.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF for 90 seconds.
2. Disconnect the X2 harness connector at the K20 ECM.
3. Test the affected IC circuit terminal 3 or C for an open, a high resistance, a short to ground and for a short to voltage.

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

4. Connect the X2 harness connector at the K20 ECM.
5. Exchange the affected T8 ignition coil/module with the T8 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 T8 ignition/coil module, replace as needed.

⇒	If the DTC or the misfire does not transfer with the suspect T8 ignition/coil module, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.