ABS

TROUBLE DIAGNOSIS FOR SYMPTOMS


Unexpected Pedal Action

1.CHECK WARNING LAMP ACTIVATION
Make sure warning lamp remains off while driving.
OK or NG
OK - GO TO 2.
NG - Carry out self-diagnosis. CONSULT-III Function (ABS).
2.CHECK BRAKE PEDAL STROKE





Check brake pedal stroke.
Is brake pedal stroke excessive?
YES - Perform Basic Inspection. Basic Inspection.
NO - GO TO 3.
3.CHECK CONNECTOR AND BRAKING PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
2. Drive vehicle and check brake operation.

NOTE:
- Stopping distance may be longer than vehicles without ABS when road condition is slippery.
- Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs in electrical control units using CAN communication. After the inspection, clear all DTCs. System Description.
OK or NG
OK - GO TO 4.
NG - Perform Basic Inspection. Basic Inspection.
4.CHECK WHEEL SENSORS
Check the following.
- Wheel sensor mounting for looseness
- Wheel sensors for physical damage
- Wheel sensor connectors for terminal damage or loose connections
- Sensor rotor and mount for physical damage
OK or NG
OK - Check ABS actuator and electric unit (control unit) connector terminals for deformation, disconnection, looseness or damage. Reconnect ABS actuator and electric unit (control unit) harness connector. Then retest.
NG - Repair or replace as necessary.