Diagnostic Instructions

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

DTC P0355: Ignition Coil 5 Control Circuit

DTC P0356: Ignition Coil 6 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	P0300, P0351
Ignition Coil 2 Control Circuit	P0300, P0352	P0300, P0352	P0300, P0352	P0300, P0352
Ignition Coil 3 Control Circuit	P0300, P0353	P0300, P0353	P0300, P0353	P0300, P0353

Circuit/System Description

The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the 6 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. The ECM monitors each IC circuit for improper voltage levels. Each ignition module/coil assembly has the following electrical circuits:

Conditions for Running the DTC

Conditions for Setting the DTC

The PCM detects a fault in an ignition coil control circuit for 90 out of 100 engine cycles.

Action Taken When the DTC Sets

DTCs P0351, P0352, P0353, P0354, P0355, and P0356 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0351, P0352, P0353, P0354, P0355, and P0356 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Description and Operation

Electronic Ignition (EI) System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

1. With the engine running, observe the Cylinder 1 through 6 IC circuit status parameters with the scan tool. All of the parameters should display OK.
2. With the engine running, observe the Misfire Current counters using the scan tool. The counters should not be incrementing.

Circuit/System Testing

1. With the engine running, observe the applicable Cylinder IC Circuit Status parameters with the scan tool.

⇒	If a parameter displays short Gnd/Open, test for an open/high resistance or a short to ground in the affected IC circuit. All wire circuit resistance should measure less than 2 ohms.

⇒	If a parameter displays short to B+, test for a short to voltage in the affected IC circuit.

2. Connect jumper wires from the harness connector of the ICM to the corresponding terminals of the ICM.
3. Using the jumper wires, exchange the affected IC control circuit with a known good IC control circuit. Also exchange the spark plug wires of the corresponding coils.
4. Start the engine.

Important: An open/high resistance on the low reference circuit to the ICM may cause a misfire.

5. Observe the Misfire Current counters with the scan tool.

⇒	If the misfire transfers with the suspect IC control circuit, replace the ECM.

⇒	If the misfire remains with the coil, replace the ICM.

Component Testing

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.