25
Troubleshooting and Testing
Table A: Sensor Check Pins
Sensor
47-Pin Harness Connector
Left Front
45 and 46
Right Front
33 and 34
Left Rear
36 and 37
Right Rear
42 and 43
4.8.4
Sensor Resistance
The sensor circuit resistance must be between 900 and 2000 ohms. Measure the resistance at the sensor
connector, or at the pins on the ECU connector, as follows:
1. Turn the ignition OFF.
2. To measure the resistance at the pins on the ECU connector, disconnect the ECU connector from the
ECU. Measure the output at the ECU pins indicated in Table A. Refer to figure for pin identification.
3. To measure the resistance at the sensor connector, disconnect the sensor from the sensor extension
cable. Measure across each set of sensor extension cable pairs. Check all four wheel end sensors.
ECU pin locations are identical to harness connector pins when viewed from the back of the
harness connector.
If measurement is not between 900 and 2000 ohms: Replace the sensor.
4.8.5
Sensor Circuit Short Verification
Each of the wheel sensors should be a closed circuit. Verify this in the below order. Use an ohmmeter to
verify if there are any shorts or continuity to ground at the:
ECU harness connector/wire harness
Wheel speed sensor
