P0355

CIRCUIT DESCRIPTION
The ignition system on this engine uses an individual ignition control module (ICM) for each cylinder. The powertrain control module (PCM) controls the ignition system operation. The PCM controls each coil using one of 8 ignition control (IC) circuits. The PCM commands the IC circuit low when a spark event is requested. This causes the ICM to energize the ignition coil to create a spark at the spark plug. Each ICM has the following circuits:
^ The ignition control circuit
^ The ignition 1 voltage circuit
^ A ground circuit
^ A reference low circuit

The sequencing and timing are PCM controlled. This DTC sets when the IC circuit is out of range.

CONDITIONS FOR RUNNING THE DTC
The engine is operating.

CONDITIONS FOR SETTING THE DTC
The PCM detects the ignition control circuit is grounded, open, or shorted to voltage for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Steps 1-10:

Steps 11-18:

The numbers below refer to the step numbers on the diagnostic table.
3. This step verifies the integrity of the IC circuit and the PCM output.
4. This step tests for a short to ground on the IC circuit.