P0605

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The VCM memory contains data which is essential to running the engine and transmission. The VCM checks the integrity of this data. If the checksum of the Boot Flash section of memory does not match a predetermined value, DTC P0605 sets.


CONDITIONS FOR SETTING THE DTC

The data checksum does not match the expected value.


ACTION TAKEN WHEN THE DTC SETS

^ The VCM illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.

^ The VCM records the operating conditions at the time the diagnostic fails. The VCM stores this information in the scan tools Freeze Frame and/or the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The VCM turns the MIL OFF after 3 consecutive drive trips when the test has Run and Passed and not Failed.

^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle).

^ Use the scan tool Clear Information function.

^ Disconnect the VCM battery feed for 30 seconds.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. Replace the VCM even if this DTC exists only in history.