P0602

Circuit Description
If a Control Module (PCM/VCM) is installed without being programmed, a DTC P0602 will be set. During Reprogramming and immediately after completion, P0602 will also be set. This DTC should be successfully cleared after following the Reprogramming procedures.

Since this diagnostic pertains to an internal VCM diagnostic check, no wiring schematic is required.

Conditions for Running the DTC
The ignition switch is in the run position

Conditions for Setting the DTC
No software data is present in the VCM

Action Taken When the DTC Sets
^ The Control Module illuminates the Malfunction Indicator Lamp (MIL) the first time the diagnostic runs and fails.
^ The Control Module will set the DTC and records the operating conditions at the time the diagnostic fails. The Control Module stores the failure information in the scan tools Freeze Frame and/or the Failure Records.

Conditions for Clearing the MIL/DTC
^ The Control Module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
^ 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 start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
^ Use the scan tool Clear Information function.

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

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis. Symptom Related Diagnostic Procedures

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, replace the VCM.