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 provide an overview of each diagnostic category. |
DTC Descriptors
DTC P0351: Ignition Coil 1 and 4 Control CircuitDTC P0352: Ignition Coil 2 and 3 Control Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | * | ** | -- | -- |
Ignition Coil 1 and 4 Control Circuit | P0300, P0351 | P0300, P0351 | P0300, P0351 | -- |
Ignition Coil 2 and 3 Control Circuit | P0300, P0352 | P0300, P0352 | P0300, P0352 | -- |
*The Engine Cranks but Does Not Run and opens the fuse that supplies voltage to the ignition coils. **The Engine Cranks but Does Not Run. | ||||
Circuit/System Description
Ignition 1 voltage is supplied to the ignition coil. The engine control module (ECM) provides a ground for the ignition coil (IC) control circuits. When the ECM removes the ground path of the ignition primary coil, the magnetic field produced by the coil collapses. The collapsing magnetic field produces a voltage in the secondary coil which ignites the spark plugs. The sequencing and timing are controlled by the ECM. The ignition coils consist of the following circuits:
| • | The ignition 1 voltage |
| • | The IC 1 and 4 control |
| • | The IC 2 and 3 control |
Conditions for Running the DTC
| • | The ignition is ON or the engine is operating. |
| • | The DTCs run continuously once the above condition is met. |
Conditions for Setting the DTC
The ECM detects an open, short to ground or voltage on the IC circuit.
Action Taken When the DTC Sets
DTC P0351 and P0352 are Type A DTCs.
Conditions for Clearing the DTC
DTC P0351 and P0352 are Type A DTCs.
Reference Information
Schematic Reference
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
- Engine idling, observe the DTC information with a scan tool. DTC P0351 and P0352 should not set.
- 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
- Ignition OFF, disconnect the harness connector of the ignition coil.
- Connect a test lamp between the ignition 1 voltage circuit of the ignition coil and the negative terminal of the battery.
- Command the fuel pump relay ON with a scan tool and load test for battery voltage between the ignition 1 voltage circuit of the ignition coil and ground.
- Connect a DMM between the appropriate ignition control circuit and the negative terminal of the battery.
- While cranking the engine, test for more than 3 Hz between the appropriate ignition control circuit and the negative terminal of the battery.
- If all circuits/connections test normal, replace the ignition coil.
Important: The test lamp is used to load the circuit and may not illuminate.
| ⇒ | If less than B+, repair the ignition 1 voltage circuit of the ignition coil for a short to ground or an open/high resistance. |
Important: Set the DMM to the AC Hertz scale for this test.
| ⇒ | If less than 3 Hz, test the ignition control circuit for a short to voltage, short to ground or an open/high resistance. If the circuit/connection test normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for engine control module replacement, setup, and programming
