DTC 35 - Rear 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.

DTC 35 will set if short to battery voltage or ground exists in circuit No. 1810 or No. 1811. Faulty speed sensor will also set DTC 35. Testing occurs when vehicle is moving. DTC will not set with ignition on and vehicle at rest.

If DTC 35 is set, anti-lock braking is disabled and EBCM turns on ANTI-LOCK indicator for remainder of ignition cycle. If failure is intermittent, EBCM will enable system at next ignition cycle and a history DTC 35 will be present.

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 proper resistance of sensor.
Checks for short to battery voltage in either of the speed sensor circuit wires.
Checks for short between speed sensor circuit wires.
Checks for short to ground in speed sensor input circuit wires. A short with resistance of less than 2 megohms, though not a direct short, may set DTC 35.
Checks if DTC resets during road test.
Checks wiring and connectors for intermittents.
Checks wheel speed sensor mounting, toothed 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 DTC reset.