Wabco D Version Hydraulic ABS Sensor Output Voltage Test

Sensor output voltage must be at least 0.2 volts AC at 30 rpm. Test the sensor output voltage as follows:

1.Turn ignition OFF.

2.Disconnect the ECU. To measure voltage at the pins on the ECU connector, disconnect thesensor from the sensor extension cable.

 

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WARNING

Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands.

Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury can result.

3.Put blocks under the front and rear tires to stop the vehicle from moving.

4.Raise the vehicle off the ground. Put safety stands under the axle.

5.Rotate wheel by hand at 30 rpm (1/2 revolution per second).

6.Measure the voltage at the pins indicated in Table F.

1-3

 

Sensor Resistance

The sensor circuit resistance must be between 900 and 2000 ohms. Measure resistance at the sensor connector, or at the pins on the ECU connector,as follows:

1.Turn ignition OFF.

2.To measure resistance at the pins on ECU connector, disconnect the ECU connector from the ECU.

To measure resistance at the sensor connector, disconnect the sensor from the sensor extension cable.

3.Measure output at the pins indicated in Table F, Sensor Check Pins.

If measurement is not between 900 and 2000 ohms, replace the sensor.

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