Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 CircuitDTC 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:
| • | Ignition voltage |
| • | Ground |
| • | IC |
| • | Low reference |
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 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
DTCs P0351-P0354 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0351-P0354 are Type B DTCs.
Reference Information
Schematic Reference
Connector End View Reference
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
| • | Start and idle the engine. |
| • | 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. |
| • | 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
- Ignition OFF for 90 seconds, disconnect the ECM.
- Test the affected IC circuit terminal 3 for an open, a high resistance, a short to ground and for a short to voltage.
- Connect the ECM.
- Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
- Start the engine and observe the scan tool.
| ⇒ | If a fault is found, repair the circuit as needed. |
| ⇒ | 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.
| • | Control Module References for ECM replacement, setup, and programming |
