Anti-Lock Brake System: Diagnosis: Notes

ABS system can only be diagnosed using ABS Tester (0000-42-0010). See Figure . An Adapter Harness (49N0-66-001) is also required to test Miata ABS system. 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 control unit with a known good unit, and retest system for correct operation.