Code 33 - Right Rear Wheel Speed Sensor Continuity: Notes

Toothed wheel generates a voltage pulse as it moves past wheel speed sensor. EBCM uses the frequency of these pulses to determine wheel speed. Amount of voltage generated in each pulse depends on air gap between wheel speed sensor and toothed wheel and on wheel speed.

SERVICE ABS and SERVICE ASR indicators will be on and Code 33 will be set if speed sensor is faulty or if there is a short to voltage or ground in circuit No. 882 or circuit No. 883. Code will set with ignition on and vehicle stopped.

1. Checks for correct resistance reading of wheel speed sensor.
2. Checks for short to battery voltage in wheel speed sensor circuit wires.
3. Checks for open in wheel speed sensor circuit wires.
4. Checks for an intermittent fault that is not currently present.
5. Checks if code resets when ignition is turned on. If Code 33 resets, speed sensor assembly is most likely at fault.
6. Checks if Code 31 sets during road test.
7. Code 31 sets with a problem in speed sensor circuits when vehicle is moving. Code 33 sets when vehicle is stopped. If Code 31 sets at this point, follow diagnostic chart for Code 31.
8. Intermittent fault may be caused by wheel speed sensor. If Code 33 is reset after sensor replacement, EBCM is detecting a fault in a speed sensor circuit when one does not exist.