P0602

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) uses an electrically erasable programmable read-only memory (EEPROM). Unlike the programmable read-only memory PROM used in earlier applications, the EEPROM is not replaceable. The only option is to replace the PCM. The replacement PCM does not contain the final program information. The PCM requires programming using the approved Techline equipment. If the replacement PCM is not programmed, this Diagnostic Trouble Code (DTC) will set. When the DTC sets, the PCM disables the fuel pump relay and the fuel injectors.

CONDITIONS FOR RUNNING THE DTC
^ DTC P0601 is not set.
^ The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The PCM does not contain the final software and calibration information that is required in order to operate the vehicle.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC "Last Test Failed" clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Use a scan tool in order to clear the MIL and the DTC.

TEST DESCRIPTION

Steps 1-3:

The numbers below refer to the step numbers on the diagnostic table.
2. Program the PCM with the correct software for the vehicle.
3. If the programming attempt fails, the PCM is faulty.