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ROM Checksum Failure

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Connect scan tool to Data Link Connector (DLC), under lower left side of instrument panel. Turn ignition on. Using scan tool, erase Central Timer Module (CTM) DTCs. Cycle ignition off, then on. Wait approximately one minute. Using scan tool, read CTM DTCs. If ROM CHECKSUM FAILURE DTC resets, go to next step. If ROM CHECKSUM FAILURE DTC does not reset, problem is intermittent. Visually inspect and wiggle test related wiring.
  2. Replace CTM. CTM is located behind left side kick panel. See CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION.
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