P0602

Diagnostic Chart:

CIRCUIT DESCRIPTION

This DTC indicates that the VCMs internal Program Memory is not flashed with any vehicle software. If you install a service VCM and do not flash the Program Memory, the engine will not run. This DTC indicates that an un-flashed VCM will cause an engine cranks but will not run situation.

CONDITIONS FOR SETTING THE DTC

There is no software data is present in the VCM.

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.

3. If the flashing procedure fails, verify that the equipment being used is functioning properly and that all cable connections are clean and tight. Also, make sure that the software you download is correct for the VCM being flashed. If everything checks out OK, and a second attempt fails, the VCM is faulty.