DTC 35 Rear Axle (Wheel) Speed Sensor Circuit Fault: Notes
As differential pinion gear turns, toothed wheel (mounted on differential pinion gear) generates a voltage pulse as it moves past sensor. Frequency and voltage generated is proportional to rear axle speed.
EBCM uses rear axle (wheel) speed sensor signal to calculate vehicle reference speeds and individual speed, acceleration and slip values for rear wheels. These values are used to determine when anti-lock control is needed.
35 will set if short to battery voltage or ground exists in circuit No. 1810 or No. 1811. Faulty wheel speed sensor will also set 35. Testing occurs when vehicle is moving. will not set with ignition on and vehicle at rest.
NOTE:
To prevent electro-magnetic interference, wheel speed sensor wires are twisted together 9 times per foot of wire. If repairs are necessary, ensure wires are properly twisted, routed and secured.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks for short to battery voltage in either wheel sensor circuit wires.
- Checks for short between wheel speed sensor circuit wires.
- Checks for short to ground in wheel speed sensor circuit wires. A short with resistance of less than 2 megohms, though not a direct short, may set 28.
- Checks if resets during road test.
- Checks wiring and connectors for intermittents.
- Checks wheel speed sensor mounting, tooth wheel and rear wheel bearing for cause of malfunction. Checks for build-up of foreign material in gaps between teeth on toothed sensor ring. Checks toothed sensor ring for large grooves, gouges and marks which may influence sensor ring signal. Inspects rear axle (wheel) speed sensor for damage and contamination.
- Replace wheel speed sensor as likely cause of reset.
- Ensures is not due to electro-magnetic interference.