GM 15131391
ABS Sensor

Before working on the wheel speed sensor you must lift the vehicle up. Unplug the wiring harness before you unscrew and take out the wheel speed sensor retaining bolt and sensor from its mounting place. You must clean both the sensor as well as its boss before installation. Put a tiny amount of axle lube inside the sensor boss hole to smooth the seal movement. Press the wheel speed sensor evenly into place until it sits flat against the sensor boss surface. Press the wheel speed sensor into bolt hole place then fasten the wheel speed sensor retaining bolt at 13 N.m with 115 lb in torque. Plug in the sensor electrical connector and let the vehicle return to the ground. Start the engine and let it run with idle speed to test if the ABS and traction control indicators stay lit. Drive the vehicle only when repair diagnoses are complete because damaged and improperly connected wheel speed sensors require professional service. Run tests to find the problem when the lamp lighting up persists. Choose a road that feels flat and clean with no traffic and only basic items standing in the path to drive the vehicle at 16 km/h or above for 5 seconds straight. After stopping analyze if either the ABS indicator or traction assist indicator lights up at night; take your car to its basic ABS diagnostic.

Start by lifting and supporting the vehicle when replacing the Wheel Speed Sensor. Completely remove the tire from the wheel then take out the brake rotor afterwards. First you need to free the wire harness retainers of the Wheel Speed Sensor before taking off its electrical plug. Move the Wheel Speed Sensor bolt while pulling the sensor directly from its bore to prevent sensor breakage. Never remove the stainless steel bearing assembly part as it should remain permanently attached; install a new bearing assembly when the sensor component shows damage to work effectively. Keep the bearing lubricant inside the sealed unit protected when you perform this task. Place the new sensor inside its mounting position and install it. Get rid of the old o-ring and put a new one on taking care to apply bearing grease to it on its outer surface only. Connect the new electrical connector to the sensor using the mount clips delivered with it. Then tighten the bolt to 18nm (13lb ft) and attach the Wheel Speed Sensor to its place. Reinstall the Wheel Speed Sensor wiring connectors to their design positions on the frame and Control Arm. Place the brake rotor back on and fit the tire back on the wheel.

Remove the sensor mounting screw and pull the sensor straight out of the bore without using a screwdriver or any prying tool.

Reconnect the wheel speed sensor electrical connector and install the wiring harness to the frame and control arm.