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Home >> Mitsubishi >> 1996 >> Montero LS, Automatic, V4AW2 >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Trouble Shooting >> Anti-Lock Warning Light >> Notes

Anti-Lock Warning Light: Notes

  1. Turn ignition on. ANTI-LOCK warning light should come on for one second, and then go out. Turn ignition switch to START position. Warning light should come on and stay on.
  2. When ignition switch is turned from START to ON position, warning light should come on for one second, and then go out. If warning light functions as specified, go to step 3). If warning light does not function as specified, see appropriate trouble shooting test:
    • IGNITION SWITCH IN ON POSITION (ENGINE NOT RUNNING), ANTI-LOCK WARNING LIGHT INOPERATIVE.
    • AFTER ENGINE STARTS, ANTI-LOCK WARNING LIGHT REMAINS ON.
    • IGNITION SWITCH IN START POSITION, ANTI-LOCK WARNING LIGHT INOPERATIVE.
    • IGNITION SWITCH IN ON POSITION, ANTI-LOCK WARNING LIGHT BLINKS TWICE. IN START POSITION, LIGHT STAYS ON. WHEN IGNITION SWITCH IS CYCLED FROM START TO ON POSITION, LIGHT BLINKS ONCE, THEN TURNS OFF.
  3. Test drive vehicle. If ANTI-LOCK warning light does not come on at low speed, go to next step. If 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 listed symptoms exist, go to step 6).
  4. 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.
  5. Ensure wheel speed sensor rotor gap is correct. See WHEEL SPEED SENSOR under ADJUSTMENTS . Check for faulty wheel speed sensor. See WHEEL SPEED SENSOR TEST . Replace sensor as necessary. See WHEEL SPEED SENSOR . Inspect ECU connectors and related wiring harness. See WIRING DIAGRAMS . If testing indicates no mechanical or electrical failures, substitute ECU with known-good unit and retest.
  6. Enter ABS self-diagnostics and retrieve Diagnostic Trouble Codes (DTCs). See RETRIEVING DTCS . If no DTCs are displayed, fault may be intermittent. Attempt to make malfunction reoccur. If no diagnostic output exists, check and repair wiring harness between ECU and data link connector. See WIRING DIAGRAMS .
NOTE: Trouble shoot ANTI-LOCK warning light in following sequence: instrument cluster circuit, ECU and valve relay.
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