P1350

Circuit Description

Under normal system operation when the key is turned ON and until engine rpm is high enough for the PCM to control spark, the PCM will open the bypass circuit (CKT 424) to the Ignition Control (IC) Module, the IC module will then ground the Ignition Control circuit (CKT 423). This is called module mode because the IC module is controlling spark. Once the engine speed is high enough, about 65 rpm, 4X reference pulses are received and no PCM faults are detected the PCM will close the bypass line and in response the IC module will unground the IC circuit, this allows PCM control of spark. This is called the ignition control mode. This diagnostic test is used to check for faults in both the bypass circuit and the IC circuit. To check both circuits this diagnostic runs two tests, one during crank and one while running. If Ignition Control pulses are detected by the PCM on the IC line while in module mode, cranking, or if no Ignition Control pulses are detected by the PCM while in ignition control mode, running, DTC P1350 will set.


Conditions for Setting the DTC

Test Conditions

^ Cranking test.

- DTC P1376 not set.

- At least 1 4X reference pulse has been received by the PCM.

^ Running test.

- DTC P0322 and P1376 not set.

- At least 14X reference pulse has been received by the PCM.

Failure Conditions

^ Cranking test.

Ignition Control pulses are received by the PCM when cranking or running test has failed THIS ignition cycle. Bypass line shorted to voltage or IC line open.

^ Running test.

No Ignition Control pulses are received by the PCM while engine is running. Bypass line open or IC line shorted to ground.


Action Taken When the DTC Sets

^ PCM ignition control is disabled for ignition cycle.

^ PCM disables EGR.

^ Transaxle shift adapts are maintained at current levels.

^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.

^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.

Conditions for Clearing the MIL/DTC

^ The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.

^ PCM battery voltage is interrupted.

^ Using a Scan tool.


Diagnostic Aids

If fault is not present check terminal contact at the IC module and PCM connectors.


Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. Checking if other DTC(s) are set that may have set this DTC.

3. The Engine Speed display that was taken when the DTC was set is used to determine which circuits to check and for what fault (open, short, etc.) to look for.