System Diagnosis

1. If the ABS warning light is ON and no fault codes are set or if fault codes can not be accessed, do Test Q (warning relay test). Test Q
2. If both the brake and ABS warning lights are ON. pedal travel has increased, and no pump operation is noted, check for low brake fluid and then do Test N (hydraulic pump test). Test N
3. If both the brake and ABS warning lights are ON, the ABS Hydraulic Pump (M102) operates normally, and no other symptoms are noted, do Test O (pressure switch test). Test O
4. If only the brake warning light is ON, check the brake fluid level and the park brake switch for a short or low fluid condition. If OK, do Test N (hydraulic pump test). Test N
5. If the ABS Hydraulic Pump (M102) runs constantly, the brake and ABS warning lights are OFF, and pedal travel seems to be normal, do Test P (pump short test). Test P
6. If the ABS Hydraulic Pump (M102) runs constantly and the brake warning light is ON, check brake fluid level and inspect system for leaks.
7. If the ETC warning light is ON for more than 60 seconds and no fault codes are set, do Test U. Test U
8. If the ETC warning light does not light for 3 seconds when the ignition is turned ON, do Test V. Test V
9. If a hydraulic fault is suspected, refer to Hydraulic System. Hydraulic System