P0354

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Steps 6 - 13:

DTC P0354 Ignition 4 Control Circuit




Circuit Description
The powertrain control module's (PCM) control circuit 4 provides a zero-volt or a 5-volt output signal to the ignition coil. The normal voltage on the circuit is zero volts. When the ignition coil receives the 5-volt signal from the PCM, it provides a ground path for the B+ supply to the primary side of the number 4 ignition coil. When the PCM shuts oft the 5 volts to the ignition coil, the ignition coil turns OFF. This causes the ignition coil primary magnetic field to collapse, producing a voltage in the secondary coil which fires the spark plug.

The circuit between the PCM and ignition coil is monitored for an open circuit, short to voltage, and short to ground. When the PCM detects a problem on ignition control circuit 4, it will set a DTC P0354.

Conditions for Setting the DTC
- The ignition is ON.
- The engine is turning, 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.
- Twenty test failures occur within 40 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 P0354 will clear after 40 consecutive warm-up cycles occur without a fault.
- DTC P0354 can be cleared by using the scan tool Clear Into 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 scan tool display related to DTC P0354 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.