Circuit Description
The powertrain control module (PCM) used in this vehicle utilizes an electrically erasable programmable read only memory (EEPROM). The EEPROM contains program information and the calibrations required for engine, transaxle, and Powertrain diagnostics operation.
The EEPROM is not replaceable. When the PCM is replaced or a calibration update is required, the PCM must be programmed using scan tool or approved Techline equipment. Refer to Powertrain Control Module Programming .
Conditions for Setting the DTC
The PCM does not contain the correct program required 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. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
DTC P0602 indicates that the PCM was not programmed. If the PCM can not be programmed the only possible repair is PCM replacement. Remember to program the replacement PCM with the correct software and calibration for the vehicle. Refer to Powertrain Control Module Programming .
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |
2 |
Did DTC P0602 set? | Go to Step 3 | System OK |
3 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- |
