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
DTC P0355: Ignition Coil 5 Control Circuit
DTC P0356: Ignition Coil 6 Control Circuit
DTC P0357: Ignition Coil 7 Control Circuit
DTC P0358: Ignition Coil 8 Control Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition Coil 1 Control Circuit | P0300, P0351 | P0300, P0351 | P0300, P0351 | -- |
Ignition Coil 2 Control Circuit | P0300, P0352 | P0300, P0352 | P0300, P0352 | -- |
Ignition Coil 3 Control Circuit | P0300, P0353 | P0300, P0353 | P0300, P0353 | -- |
Ignition Coil 4 Control Circuit | P0300, P0354 | P0300, P0354 | P0300, P0354 | -- |
Ignition Coil 5 Control Circuit | P0300, P0355 | P0300, P0355 | P0300, P0355 | -- |
Ignition Coil 6 Control Circuit | P0300, P0356 | P0300, P0356 | P0300, P0356 | -- |
Ignition Coil 7 Control Circuit | P0300, P0357 | P0300, P0357 | P0300, P0357 | -- |
Ignition Coil 8 Control Circuit | P0300, P0358 | P0300, P0358 | P0300, P0358 | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: OK or Incomplete | |||
Ignition Control (IC) Circuit Status for Cylinders 1-8 | Short to Ground/Open | Short to Ground/Open | Short to B+ |
Circuit/System Description
The ignition system on this engine uses an individual coil/module for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the eight individual ignition control (IC) circuits. When the ECM commands the IC circuit ON, electrical current will flow through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM will command the IC circuit OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary coil windings, producing a high voltage across the spark plug electrodes. The ECM uses information from the crankshaft position (CKP) sensor, and the camshaft position (CMP) sensor for sequencing and timing of the spark events. Each ignition module/coil assembly has the following electrical circuits attached.
| • | An ignition 1 voltage circuit |
| • | A ground circuit |
| • | An IC circuit |
| • | A low reference circuit |
If the ECM detects that the IC circuit has an incorrect voltage level, DTC P0351-P0358 will set.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTC P0351-P0358 runs continuously when the above condition is met. |
Conditions for Setting the DTC
The ECM detects one of the following failures on the IC circuit:
| • | An open |
| • | A short to ground |
| • | A short to voltage |
Action Taken When the DTC Sets
DTCs P0351-P0358 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0351-P0358 are Type B DTCs.
Diagnostic Aids
| • | This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test . |
| • | A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electronic Ignition (EI) System Description
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Start and run the engine.
- Observe the Misfire Current counters using the scan tool. The counters should not be incrementing.
| ⇒ | If the counters are incrementing for any of the cylinders, continue with Circuit/System Testing. |
| ⇒ | If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List. |
Circuit/System Testing
- Turn OFF the ignition.
- Disconnect the ECM C2 harness connector.
- Test the affected IC circuit for the following:
- Connect the ECM C2 harness connector.
- Exchange the affected ignition coil/module, with the ignition coil/module of a cylinder that is not affected.
- Start the engine and observe the scan tool.
Important: A high resistance on any IC circuit can cause a misfire before the DTC sets.
| • | Short to voltage |
| • | Short to ground |
| • | Open/high resistance |
| ⇒ | If a fault is found, repair the circuit as needed. |
| ⇒ | If the DTC or the misfire transfers with the suspect ignition coil/module, replace that ignition coil/module assembly. |
| ⇒ | If the DTC or the misfire does not transfer with the suspect ignition coil/module, replace the ECM. |
Repair Instructions
| • | Engine Control Module Replacement and Control Module References for ECM replacement, setup, and programming |
Repair Verification
- Operate the vehicle at 2,500 RPM, for 5 minutes.
- Operate the vehicle within the Conditions for Running DTC P0420. Refer to DTC P0420 . If DTC P0420 runs and fails, then diagnosis those DTCs.
- Clear the DTCs with a scan tool.
- Turn OFF the ignition for one minute.
