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

DTC P2300: Ignition Coil 1 Control Circuit Low Voltage

DTC P2301: Ignition Coil 1 Control Circuit High Voltage

DTC P2303: Ignition Coil 2 Control Circuit Low Voltage

DTC P2304: Ignition Coil 2 Control Circuit High Voltage

DTC P2306: Ignition Coil 3 Control Circuit Low Voltage

DTC P2307: Ignition Coil 3 Control Circuit High Voltage

DTC P2309: Ignition Coil 4 Control Circuit Low Voltage

DTC P2310: Ignition Coil 4 Control Circuit High Voltage

DTC P2312: Ignition Coil 5 Control Circuit Low Voltage

DTC P2313: Ignition Coil 5 Control Circuit High Voltage

DTC P2315: Ignition Coil 6 Control Circuit Low Voltage

DTC P2316: Ignition Coil 6 Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition Voltage - Bank 1	P0300-P0306, P2300, P2306, P2312	P0300-P0306, P0351, P0353, P0355	--	P0300, P0301, P0303, P0305
Ignition Voltage - Bank 2	P0300-P0306, P2303, P2309, P2315	P0300-P0306, P0352, P0354, P0356	--	P0300, P0302, P0304, P0306
Ignition Coil 1 Control Circuit	P2300	P0301, P0351	P2301	P0300, P0301
Ignition Coil 2 Control Circuit	P2303	P0302, P0352	P2304	P0300, P0302
Ignition Coil 3 Control Circuit	P2306	P0303, P0353	P2307	P0300, P0303
Ignition Coil 4 Control Circuit	P2309	P0304, P0354	P2310	P0300, P0304
Ignition Coil 5 Control Circuit	P2312	P0305, P0355	P2313	P0300, P0305
Ignition Coil 6 Control Circuit	P2315	P0306, P0356	P2316	P0300, P0306

Circuit/System Description

The ignition system on this engine uses individual ignition coils and ignition control (IC) circuits for each cylinder. Ignition voltage is supplied to each bank of ignition coils. The engine control module (ECM) controls the ignition system operation. The ECM controls each coil using the IC circuits. The ECM commands the IC circuit low when a spark event is requested.

The sequencing and timing are ECM controlled.

Conditions for Running the DTC

Conditions for Setting the DTC

P0351-P0356

The ECM detects the ignition control circuit is open for greater than 4 seconds or a cumulative of 30 seconds.

P2300, P2303, P2306, P2309, P2312, or P2315

The ECM detects the ignition control circuit is shorted to ground for greater than 4 seconds or a cumulative of 30 seconds.

P2301, P2304, P2307, P2310, P2313, or P2316

The ECM detects the ignition control circuit is shorted to voltage for greater than 4 seconds or a cumulative of 30 seconds.

Action Taken When the DTC Sets

DTCs P0351, P0352, P0353, P0354, P0355, P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, and P2316 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0351, P0352, P0353, P0354, P0355, P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, and P2316 are Type B DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Ignition (EI) System Description

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

1. Operate the engine for 30 seconds. Observe the DTC information with a scan tool. DTC P0351, P0352, P0353, P0354, P0355, P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, or P2316 should not set.
2. 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 appropriate ignition coil.
2. Ignition ON, verify that a test lamp illuminates between ignition voltage circuit terminal listed below and ground.

•	Terminal D for LY7

•	Terminal 2 for LLT

⇒	If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.

3. Crank or start the engine. Test for 200-400 mV between the IC circuit terminal listed below and ground.

•	Terminal C for LY7

•	Terminal 1 for LLT

⇒	If less than the specified range, test the IC circuit for a short to ground or an open/high resistance. If the circuit/connection tests normal, replace the ECM.

⇒	If greater than the specified range, test the IC circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.

4. Connect a test lamp between the each of the ground circuits terminal listed below, and B+. The test lamp should illuminate on each circuit.

•	Terminal A for LY7

•	Terminal 3 for LLT

•	Terminal 4 for LLT

⇒	If the test lamp does not illuminate, test the circuit for an open/high resistance.

Note: This step only applies to the LY7 engine.

5. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal B and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits/connections test normal, replace the ignition coil.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.