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:

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.

DTCs P0351-P0354 are Type B DTCs.

DTCs P0351-P0354 are Type B DTCs.

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

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.

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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.