A DTC 31, 41 RF Sensor

A1- Check Resistance Circuits 514 and 516
- Disconnect 16-pin connector C140 on jumper from ABS assembly to wire harness.
- Measure resistance between pins C140-2 and C140-13 on Wire harness side connector.
- Is resistance between 1015 and 1245 ohms?
YES - Go to A3.
NO - Go to A2.

A2- Check Anti-Lock Sensor Resistance
- Disconnect RH front sensor from sire harness.
- Measure resistance between pins C145M-1 and C145M-2 on sensor.
- Is resistance between 1015 and 1245 ohms?
YES - Service or replace cable harness circuit 514 (Y/R) or 516 (Y/BK).
NO - Replace RH front anti-lock brake sensor. Wheel Speed Sensor

A3- Check Circuits 514 and 516 at Jumper Harness
- Remove cover from hydraulic control module.
- Disconnect jumper harness from anti-lock brake control module.
- Check for broken or damaged wire in jumper between C140-2 (16-pin side) and C142-8 (15-pin side) or between C140-13 (16-pin side) and C142-14 (15-pin side).
- Are both wires OK?
YES - Go to A4.
NO - Service or replace broken or damaged wire in jumper.

A4- Check Anti-Lock Sensor For Short To Ground
- Remove cover from hydraulic control unit.
- Disconnect jumper harness from anti-lock brake control module.
- Check for a short from ground to Pin C142-8.
- Check for a short from ground to Pin C142-14.
- Is resistance 5 ohms or less?
YES - Service or replace jumper circuit 514 (Y/R) or 516 (Y/BK), or RH front anti-lock brake sensor.
NO - Go to A5.

A5- Check RH Front Anti-lock Brake Sensor Air Gap
- Remove the RH front wheel and tire.
- Check for damage to the front anti-lock brake sensor or anti-lock sensor indicator.
- Check for objects sticking to the front anti-lock brake sensor or anti-lock sensor indicator.
- Check air gap between the sensor and indicator. Gap should be 0.50-0.95 mm (0.020-0.037 inch).
- Check for excessive wheel bearing end play. Refer to Transmission and Drivetrain.
- Are the conditions OK?
YES - If the light is coming on all the time, replace the anti-lock brake control module.
NO - Service condition as required.