P0351

DTC P0351-P0354

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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/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:

* Ignition voltage circuit
* Ground
* IC circuit
* Low reference circuit

Conditions for Running the DTC

* The engine is running.
* DTCs P0351-P0354 run continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage in the 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.

Circuit/System Verification

1. Start and idle the engine.
2. Observe the scan tool DTC Information and the 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, disconnect the harness connector at the affected ignition coil/module.
2. Ignition OFF for 90 seconds, disconnect the ECM connector X2.
3. Test for an open, a high resistance, a short to ground and for a short to voltage between the ignition coil/module IC circuit terminal C and the appropriate ECM terminal listed below:

* IC 1 circuit: terminal 1
* IC 2 circuit: terminal 53
* IC 3 circuit: terminal 17
* IC 4 circuit: terminal 33

^ If a fault 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 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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Ignition Coil Replacement