P0351

Diagnostic Chart:

Wiring Diagram:

The PCM controls dwell and spark timing during all engine running conditions. The electronic ignition module (EI) charges the coil pack when the PCM supplies 5 volts to the 1/4 coil. The coil will then discharge or fire through its secondary coil towers whenever the voltage supply has been turned Off by the PCM.

DTC PARAMETERS

During cranking the PCM pulses the ignition control (IC) circuit high and low. The PCM monitors the diagnostic feedback circuit to diagnose circuit faults.

DTC P0351 will set if there is an open, short to voltage or short to ground in IC 1 and 4 (circuit 423).

OR

DTC P0351 and P1351 will set if there is a short to voltage in IC 1 and 4 (circuit 423) when:

^ The engine is in cranking mode.

NOTE: IC circuit 1 and 4 is checked continuously whenever crankshaft position sensor pulses are received by the PCM during cranking mode only.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool to review malfunction history diagnostic information. The supplemental data can be used to duplicate a problem.

Intermittents or opens suspected to be at the connector can be detected by using diagnostic service probe Voltage can be read on wire without disconnecting any connectors.

Check the tightness of the female terminal grip with a spare male terminal.

The IC circuit 1 and 4 consists of an ignition module, circuit 423 and the PCM.

^ A malfunctioning 1 and 4 coil, 1 and 4 secondary wire or 1 or 4 spark plug will not cause a P0351 and/or P1351 to set.

^ A blown EIS fuse will cause a no start condition but a IC 1 and 4 DTC may not set.

^ An IC 1 and 4 circuit fault may set a cam missing code DTC P0340.

^ If engine starts with a fault on the IC circuit a misfire (DTC P0300) may also be set.

NOTE: If there is an open in the IC 1 and 4 circuit a misfire on those cylinders will occur.