P0355

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

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 that the ignition control circuit is grounded, open, or shorted to voltage.
^ The above conditions are met 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.
^ Use a scan tool in order to clear the MIL and the DTC.

TEST DESCRIPTION

Steps 1-8:

Steps 9-19:

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