Front Wheel Sensor.
- Using DVOM, check resistance between terminals No. 4 and 6 (left sensor) of ECU connector. Check resistance between terminals No. 21 and 23 (right sensor) of ECU connector. As wheels are rotated, resistance should fluctuate between 900-2200 ohms.
- If resistance is not within specification, check resistance at sensor connectors on suspension tower in engine compartment. If resistance is now within specification, repair wiring harness to ECU. If resistance is still not within specification, replace sensor. See Fig 1
Courtesy of VOLVO CARS OF NORTH AMERICA.