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 ECM detects an open, short to ground, or a short to voltage on the IC circuit.

DTCs P0351 and P0352 are Type A DTCs.

DTCs P0351 and P0352 are Type A DTCs.

Schematic Reference

Engine Controls Schematics

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Engine idling, observe the DTC information with a scan tool. DTCs P0351 and P0352 should not set.

1. Ignition OFF, disconnect the harness connector at the ignition coil.
2. Ignition ON, test for battery voltage between the ignition 1 voltage circuit terminal B and ground.

⇒	If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.

Important: Set the DMM to the AC Hertz scale for this test.

3. Connect a DMM between the appropriate ignition control circuit and ground.

•	Ignition Coil 1 and 4 control terminal C

•	Ignition Coil 2 and 3 control terminal A

4. Engine cranking, test for greater than 3 Hz between the appropriate ignition control circuit and ground.

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

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.