P0354

DTC P0354

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

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






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:
- An ignition voltage circuit
- A ground
- An IC control circuit
- A low reference circuit

CONDITIONS FOR RUNNING THE DTC
- The engine is running.
- DTCs P0351-P0354 runs continuously when the above condition is met.

CONDITIONS FOR SETTING THE DTC
- The ECM detects an open on the circuit or the ignition coil/module for less than 1 second.OR
- The ECM detects a short to ground on the circuit or the ignition coil/module for less than 1 second.OR
- The ECM detects a short to voltage on the circuit or the ignition coil/module for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM TESTING
1. Turn OFF the ignition.
2. Disconnect the ECM.
3. Test the affected IC circuit 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.

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

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

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Ignition Coil(s) Replacement
- Control Module References for ECM replacement, setup, and programming