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ABS wheel sensor - testing, removal and refitting
Braking system / ABS wheel sensor - testing, removal and refitting


Testing
1 Checking of the sensors is done before removal, connecting a voltmeter to the disconnected sensor multi-plug. Using an analogue (moving coil) meter is not practical, since the meter does not respond quickly enough. A digital meter having an AC facility may be used to check that the sensor is operating correctly. To do this, raise the relevant wheel then disconnect the wiring to the ABS sensor and connect the meter to it.

Spin the wheel and check that the output voltage is between 1.5 and 2.0 volts, depending on how fast the wheel is spun.

Alternatively, an oscilloscope may be used to check the output of the sensor - an alternating current will be traced on the screen, of magnitude depending on the speed of the rotating wheel.

2 If the sensor output is low or zero, renew the sensor.

Removal
Front wheel sensor
3 Apply the handbrake, jack up the front of the vehicle and support it on axle stands.

Remove the relevant wheel.

4 Unscrew the sensor mounting bolt located on the steering knuckle, and withdraw the sensor (see illustrations).

21.4 Unscrew the mounting bolt and remove the ABS sensor
21.4 Unscrew the mounting bolt and remove the ABS sensor

5 Remove the sensor wiring loom from the support brackets on the front suspension strut and wheel arch.

6 Prise out the stud clips, and remove the Torx screws and screw clips holding the wheel arch liner in position. Withdraw the liner.

7 Disconnect the multi-plug, and withdraw the sensor and wiring loom.

Rear wheel sensor
8 Chock the front wheels, and engage 1st gear (or УPФ). Jack up the rear of the vehicle and support it on axle stands. Remove the relevant wheel.

9 Unscrew the sensor mounting bolt, located on the brake backplate (drum brakes) or rear suspension knuckle (disc brakes), and withdraw the sensor.

10 On disc brake models, prise out the stud clips, and remove the Torx screws and screw clips holding the wheel arch liner in position.

Withdraw the liner.

11 Disconnect the sensor wiring loom from the supports on the rear suspension strut (or knuckle) and wheel arch.

12 Working inside the vehicle, lift the rear seat cushion, then disconnect the multi-plug for the sensor wiring loom (see illustration).

21.12 Rear ABS sensor wiring multi-plug located beneath the rear seat
21.12 Rear ABS sensor wiring multi-plug located beneath the rear seat

13 Withdraw the sensor and wiring loom through the rubber grommet in the rear floor.

Refitting
Front and rear wheel sensors 14 Refitting is a reversal of the removal procedure.


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