P0602

CIRCUIT DESCRIPTION

This DTC is designed to prevent a service PCM installed in a vehicle from operating without first flashing software into it.

CONDITIONS FOR SETTING THE DTC

Test Condition

Test continuously.

Failure Condition

No software data is present in PCM.

ACTION TAKEN WHEN THE DTC SETS

^ Fuel pump is disabled.
^ Injector pulse width is set to 0.
^ Back-up fuel is disabled.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The PCM will command a message to be displayed.
^ The PCM may record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records.

CONDITIONS FOR CLEARING THE MESSAGE/DTC

^ The PCM will turn the message OFF after one run and pass of the diagnostic test.
^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
^ PCM battery voltage is interrupted.
^ Using a Scan tool.

TEST DESCRIPTION

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

2. Flashing the PCM with the correct software for the vehicle.
3. If flashing attempt fails the PCM is faulty.