Anti-Lock Brake System: Diagnosis: Notes

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ABS can only be diagnosed using ABS Tester (0000-42-0010) and Adapter Harness (49-H066-003). ABS tester cannot diagnose ABS control unit. If a malfunction is detected in ABS and all other components in brake system are okay, replace ABS control unit.

If ABS tester is unavailable, test each component of ABS. See test procedures under TESTING. If all ABS components test okay, replace ABS control unit with a known good unit and retest system.