P0351

DTC P0351 Ignition 1 Control Circuit

Wiring Diagram:

Circuit Description
ION Sensing Module has the function to energize and de-energize the primary ignition coil in response to signals from the PCM. The PCM controls ignition timing and dwell time.

This diagnosis detects open circuit or short-circuiting in the Ignition Electronic Spark Timing (EST) line by monitoring EST signals. A failure determination is made when the signal voltage remains higher or lower than the threshold for corresponding fault code beyond a predetermined time period.
When the PCM detects a problem on EST control circuit 1, it will set a DTC P0351.

Conditions for Setting the DTC
- The ignition is "ON."
- The engine is running, determined by the 58X crankshaft position input signal.
- The output voltage is not equal to 5 volts when output is "ON."
- The output voltage is not equal to 0 volts when output is "OFF."
- Ten test failures occur within 10 samples of continuous spark events.

Action Taken When the DTC Sets
- The PCM will illuminate the malfunction indicator lamp (MIL) the first time the fault is detected.
- The PCM will store conditions which were present when the DTC was set as Freeze Frame and in the Failure Records data.

Conditions for Clearing the MIL/DTC
- The PCM will turn the MIL "OFF" on the third consecutive trip cycle in which the diagnostic has been run and the fault condition is no longer present.
- A history DTC P0351 will clear after 40 consecutive warm-up cycles occur without a fault.
- DTC P0351 can be cleared by using the Tech 2 "Clear Info" function or by disconnecting the PCM battery feed.

Diagnostic Aids
Check for the following conditions:
- Poor connection at PCM - Inspect the harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections.
- Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the Tech 2 display related to DTC P0351 while moving the connector and wiring related to the ignition system. A change in the display will indicate the location of the fault.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

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DTC P0351 - Ignition 1 Control Circuit