Spark

DTC P0351-P0354 - FX3

Ignition 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 coil consist of the following circuits:

The ECM detects a short circuit to voltage, a short circuit to ground, or an open circuit on the ignition coil control circuit.

DTC P0351, P0352, P0353, and P0354 are Type E DTCs.

DTC P0351, P0352, P0353, and P0354 are Type E DTCs.

The mounting bracket for the coil assembly provides the ground for the ignition coils. Ensure the mounting bolts are torqued to the correct specification. Refer to Fastener Tightening Specifications .

Schematic Reference

Engine Controls Schematics : Siemens ECM - LPG with LCP → Siemens ECM - Gas without FX3 or LCP → Delphi ECM - FX3

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Engine running, observe the DTC information with a scan tool. DTC P0351, P0352, P0353, and P0354 should not set.
2. Observe the ignition coil control circuit test status parameters. Each of the ignition coil control circuit test status parameters should display OK or Not Run.
3. 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.

1. Ignition OFF, disconnect the harness connectors at the appropriate ignition coil.

•	T8A Ignition Coil 1 and T8C Ignition Coil 3

•	T8B Ignition Coil 2 and T8D Ignition Coil 4

2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.

3. Connect a DMM between the appropriate ignition coil control circuit and the ignition circuit terminal 1.

•	Ignition coil 1 control circuit terminal 3

•	Ignition coil 2 control circuit terminal 3

•	Ignition coil 3 control circuit terminal 3

•	Ignition coil 4 control circuit terminal 3

4. Engine cranking, test for more than 2 Hz between the appropriate ignition coil control circuit and the ignition circuit.

⇒	If less than the specified range, test the ignition coil control circuit for a short circuit to voltage, short circuit to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.

5. If all circuits test normal, test or replace the appropriate ignition coil.

•	T8A Ignition Coil 1

•	T8B Ignition Coil 2

•	T8C Ignition Coil 3

•	T8D Ignition Coil 4

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.