Diagnostic Aids

If engine functions properly, check for a burned out bulb, blown ALT fuse, or an open in the MIL (SERVICE ENGINE SOON) control circuit. This will result in no brake warning light, oil or generator lights, seat belt reminder, etc.

If engine cranks but will not operate, check for continuous battery ECM-BAT fuse blown, TCM ignition in-line fuse blown, battery feed circuit to TCM open, ignition feed circuit to TCM open, or poor connection at TCM.