Anti-Lock Warning Light: Notes
- Turn ignition on. ANTI-LOCK warning light should illuminate. Turn ignition switch to START position. Warning light should flash once (approximately one second) and go out.
- If warning light functions as specified, go step 3). If warning light does not function as specified, see appropriate trouble shooting test:
- ANTI-LOCK WARNING LIGHT INOPERATIVE.
- ENGINE RUNNING, ANTI-LOCK WARNING LIGHT REMAINS ON.
- IGNITION SWITCH IN ON POSITION, WARNING LIGHT STAYS ON FOR APPROXIMATELY ONE SECOND, THEN SWITCHES OFF.
- IGNITION SWITCH TURNED TO START POSITION, WARNING LIGHT SWITCHES OFF (DOES NOT BLINK ONCE).
- Test drive vehicle. If ABS light does not come on at low speed, go to next step. If ABS light comes on at low speed, motor relay, solenoid valve or wheel speed sensor malfunction is indicated. Go to step 6). If insufficient braking force or ABS malfunction exists, go to next step. If none of above symptoms exist, go to step 6).
- Check conventional brake system components for proper operation. Check for mechanical lock of hydraulic unit solenoid valve. Check for plugged hydraulic line in hydraulic unit. Repair or replace as necessary. If hydraulic unit is okay, go to next step.
- Check for faulty wheel speed sensor. See WHEEL SPEED SENSOR under COMPONENT TESTING. Replace sensor as necessary. See WHEEL SPEED SENSOR under REMOVAL & INSTALLATION. Inspect ECU wiring. If testing indicates no mechanical or electrical failures, replace ECU.
- Enter ABS self-diagnostics, and retrieve codes. See RETRIEVING CODES under SELF-DIAGNOSTIC SYSTEM. If no codes are displayed, fault may be intermittent. Try to make malfunction reoccur. If no diagnostic output exists, check for faulty wiring harness between ECU and self-diagnostic connector. Repair or replace as necessary.