ABS <4WD> -On-vehicle Service35B-28
SymptomRemedy Probable causes
Noisy or disturbed waveformOpen circuit in sensorReplace sensor
Open circuit in harnessCorrect harness
Incorrectly mounted wheel speed sensorMount correctly
ABS rotor with missing or damaged teethReplace ABS rotor
Caution
Because the wheel speed sensor cables move together with the front and rear suspension, they
vibrate greatly when driving over poor road surfaces. As a result, the sensor harnesses should also
be shaken when monitoring of output waveforms of the wheel speed sensors in order to simulate
conditions such as driving over poor road surfaces.
HYDRAULIC UNIT CHECK
1. Jack up the vehicle and support the vehicle with rigid racks placed at the specified jack-up points
or place the wheels which are checked on the rollers of the braking force tester.
Caution
(1) The roller of the braking force tester and the tyre should be dry during testing.
(2) When testing the front brakes, apply the parking brake, and when testing the rear brakes,
stop the front wheels by chocking them.
2. Turn the ignition key to the “LOCK” (OFF) position and set the MUT-II.
Caution
Turn the ignition key to the “LOCK” (OFF) position before connecting or disconnecting the
MUT-II.
3. After checking that the shift lever is in neutral, start the engine.
4. Use the MUT-IIto force-drive the actuator.
NOTE
(1) During the actuator test, the ABS warning lamp will illuminate and the anti-skid control will be
cancelled.
(2) When the ABS has been interrupted by the fail-safe function, the MUT-IIactuator testing cannot
be carried out.
5. Turn the wheel by hand and check the change in braking force when the brake pedal is depressed.
When using the braking force tester, depress the brake pedal until the braking force is at the following
values, and check that the braking force decreases when the actuator is force-driven.
Front wheel785 - 981 N
Rear wheel588 - 784 N
ABS <4WD> -G Sensors and Steering Wheel Sensor35B-35
G SENSORS AND STEERING WHEEL
SENSOR
REMOVAL AND INSTALLATION
Refer to GROUP 22 - Sensor, Switch and Relay.
Parking brake lever
Lateral G sensorLongitudinal G sensor
Steering wheel sensor
