P0353

CIRCUIT DESCRIPTION

Schematic:

The electronic ignition system uses an individual ignition coil for each cylinder. There are two separate ignition module assemblies located in the camshaft cover of each cylinder bank. Each ignition module assembly contains an ignition control module and four ignition coils. Each ignition coil connects directly to a spark plug using a boot. This arrangement eliminates the need for secondary ignition wires. The ignition module assemblies receive power from a fused ignition feed. Both ignition module assemblies connect to chassis ground. A Reference Low and four Ignition Control (IC) circuits connect each ignition module assembly to the PCM. The PCM uses the individual IC circuits to control coil sequencing and spark timing for each ignition coil. The IC circuits transmit timing pulses from the PCM to the ignition control module to trigger the ignition coil, and fire the spark plug. The PCM monitors each IC circuit for improper voltage levels. If the PCM detects an improper voltage level on the IC circuit for cylinder #3, DTC P0353 will set.

CONDITIONS FOR RUNNING THE DTC
The engine is running.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects a short to ground on the IC circuit for cylinder #3.
^ The condition exists for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS

NOTE: Refer to Connector Test Adapter kit J 35616-A Notice in Service Precautions.

An intermittent may be caused by any of the following conditions:
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Also inspect the wiring harness and the connectors for any of the following conditions:
^ Faulty connections at the PCM or the Ignition Control Module (ICM)
^ A damaged harness

If a condition is found, repair as necessary. Refer to Wiring Repairs in Diagrams.

If the wiring harness appears to be OK, disconnect the ICM, turn the ignition ON, and connect a Digital Multimeter (DMM) between the IC circuit and battery positive voltage. Observe the DMM while moving the connectors and harnesses related to the ICM. A change in voltage will indicate the location of the malfunction.

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

TEST DESCRIPTION

Steps 1 - 8: