P0351
CIRCUIT DESCRIPTIONIgnition Coil 1, 3, 5 And 7 Control Circuit Schematic:
The electronic ignition system uses an individual ignition coil for each cylinder. There are 2 separate ignition module assemblies located in the camshaft cover of each cylinder bank. Each ignition module assembly contains an ignition control module and 4 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 4 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 #1, DTC P0351 will set.
CONDITIONS FOR RUNNING THE DTC
Engine speed is more than 400 RPM.
CONDITIONS FOR SETTING THE DTC
^ The PCM detects a short to ground on the IC circuit for cylinder #1.
^ 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 tunction.
DIAGNOSTIC AIDS
NOTE: Refer to Connector Test Adapter Kit J 35616-A Notice in Service Precautions.
If the condition is intermittent refer to Intermittent Conditions in Symptoms.
TEST DESCRIPTION
