ROM Checksum Failure

Possible Cause:

Read Only Memory (ROM) check sum failure.

CAUTION: Always turn ignition off before disconnecting or connecting any control module connector. Failure to do so could result in damage to control module.

NOTE: Ensure vehicle being tested has a fully charged battery. If it does not, false DTCs or error messages may occur.

NOTE: For component location, see appropriate illustration under COMPONENT LOCATIONS . For terminal identification, see appropriate illustration under CONNECTOR IDENTIFICATION . For circuit and wire color identification, see WIRING DIAGRAMS . For component removal and installation procedures, see appropriate component under REMOVAL & INSTALLATION .

Testing:

Turn ignition off. Connect DRBIII(R) to DLC. Turn ignition on. Using the DRBIII(R), erase CTM DTCs. Cycle ignition off, then on and wait approximately one minute. Using the DRBIII(R), read CTM DTCs. Does this DTC reset. If yes, replace CTM. Perform BODY VERIFICATION TEST under VERIFICATION TESTS. If no, test is complete.