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Circuit Test Dd - Wheel Sensor Diagnosis

  1. Codes 31, 35, 41, 55 Or 75: LF Wheel Sensor Check Turn ignition off. Disconnect 32-pin connector from ECM. Connect Breakout Box (T83L-50-EEC-IV) and Adapter (T87P-50-ALA). Measure resistance at pins No. 5 and No. 22 on breakout box. If resistance is 800-1400 ohms, go to step 3). If resistance is not as specified, go to step 2).
  2. LF Wheel Sensor Resistance Check Disconnect left front wheel sensor connector and measure resistance of sensor. If resistance is 800-1400 ohms, repair circuit No. 521 or No. 522. If resistance is not 800-1400 ohms, replace wheel sensor.
  3. LF Wheel Sensor Voltage Check Turn ignition off. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Place multimeter in 2-volt AC range. Measure voltage at breakout box pins No. 5 and No. 22 while rotating left front wheel at one revolution per second. If voltage is .05-.70 volt AC, go to step 4). If voltage is not as specified, check sensor mounting, sensor air gap or toothed ring for damage, wear or misalignment. Repair or replace components as necessary.
  4. LF Wheel Sensor Circuit Continuity Check Check for continuity between breakout box pins No. 5 and No. 40. If there is no continuity, go to step 6). If there is continuity, go to step 5).
  5. LF Wheel Sensor Continuity Check Disconnect left front wheel sensor connector. Check for continuity between each wheel sensor terminal and body ground. If there is continuity at either terminal, replace wheel sensor. If there is no continuity at either terminal, repair circuit No. 521 or 522.
  6. ECM Ground Circuit Check Using ohmmeter, check for continuity between breakout box pin No. 40 and body ground. If there is continuity, go to step 7). If there is no continuity, repair circuit No. 530.
  7. LF Wheel Bearing Check Check front wheel bearing adjustment. Check toothed sensor ring for damage. Adjust wheel bearings or replace toothed sensor ring. If no problem is found, reverify symptom. If problem is found, repair or replace components as necessary.
  8. Codes 32, 36, 42, 56 Or 76: RF Wheel Sensor Check Turn ignition off. Disconnect 32-pin connector from ECM. Connect breakout box and adapter. Measure resistance at pins No. 3 and No. 20 on breakout box. If resistance is 800-1400 ohms, go to step 10). If resistance is not as specified, go to step 9).
  9. RF Wheel Sensor Resistance Check Disconnect right front wheel sensor connector. Measure sensor resistance. If resistance is 800-1400 ohms, repair circuit No. 514 or No. 516. If resistance is not as specified, replace wheel sensor.
  10. RF Wheel Sensor Voltage Check Turn ignition off. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Place multimeter in 2-volt AC range. Measure voltage at breakout box pins No. 3 and No. 20 while rotating right front wheel at one revolution per second. If voltage is .05-.70 volt AC, go to step 11). If voltage is not as specified, check sensor mounting, sensor air gap or toothed ring for damage, wear or misalignment. Repair or replace components as necessary.
  11. RF Wheel Sensor Circuit Continuity Check Check for continuity between breakout box pins No. 3 and 40. If there is no continuity, go to step 13). If there is continuity, go to step 12).
  12. RF Wheel Sensor Continuity Check Disconnect right front wheel sensor connector. Check for continuity between each wheel sensor terminal and body ground. If there is continuity at either terminal, replace wheel sensor. If there is no continuity at either terminal, repair circuit No. 514 or No. 516.
  13. ECM Ground Circuit Check Check for continuity between breakout box pin No. 40 and body ground. If there is continuity, go to step 14). If continuity is not present, repair circuit No. 530.
  14. RF Wheel Bearing Check Check front wheel bearing adjustment. Check toothed sensor ring for damage. Adjust wheel bearings or replace toothed sensor ring. If no problem is found, reverify symptom. If problem is found, repair or replace components as necessary.
  15. Codes 33, 37, 43, 57 Or 77: RR Wheel Sensor Check Turn ignition off. Disconnect 32-pin connector from ECM. Connect breakout box and adapter. Measure resistance at pins No. 6 and No. 23 on breakout box. If resistance is 800-1400 ohms, go to step 17). If resistance is not as specified, go to step 16).
  16. RR Wheel Sensor Resistance Check Disconnect right rear wheel sensor connector. Check sensor resistance. If resistance is 800-1400 ohms, repair circuit No. 523 or No. 524. If resistance is not as specified, replace wheel sensor.
  17. RR Wheel Sensor Voltage Check Turn ignition off. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Place multimeter in 2-volt AC range. Measure voltage at breakout box pins No. 6 and No. 23 while rotating right rear wheel at one revolution per second. If voltage is .05-.70 volt AC, go to step 18). If voltage is not as specified, check sensor mounting, sensor air gap or toothed ring for damage, wear or misalignment. Repair or replace components as necessary.
  18. RR Wheel Sensor Circuit Continuity Check Check for continuity between breakout box pins No. 6 and No. 40. If there is no continuity, go to step 20). If there is continuity, go to step 19).
  19. RR Wheel Sensor Continuity Check Disconnect right rear wheel sensor connector. Check for continuity between each wheel sensor terminal and body ground. If there is continuity at either terminal, replace wheel sensor. If there is no continuity at either terminal, repair circuit No. 523 or No. 524.
  20. ECM Ground Circuit Check Check for continuity between break-out box pin No. 40 and body ground. If there is continuity, go to step 21). If continuity is not present, repair circuit No. 530.
  21. Excessive Axle Vibration Check Check rear axle and housing for excessive play. Check toothed sensor ring for damage. Repair or replace damaged components. If no problem is found, reverify symptom.
  22. Codes 34, 38, 44, 58 Or 78: LR Wheel Sensor Check Turn ignition off. Disconnect 32-pin connector from ECM. Connect breakout box and adapter. Measure resistance at pins No. 4 and No. 21 on breakout box. If resistance is 800-1400 ohms, go to step 24). If resistance is not as specified, go to step 23).
  23. LR Wheel Sensor Resistance Check Disconnect left rear wheel sensor connector. Measure sensor resistance. If resistance is 800-1400 ohms, repair circuit No. 518 or No. 519. If resistance is not as specified, replace wheel sensor.
  24. LR Wheel Sensor Voltage Check Turn ignition off. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Place multimeter in 2-volt AC range. Measure voltage at breakout box pins No. 4 and No. 21 while rotating left rear wheel at one revolution per second. If voltage is .05-.70 volt AC, go to step 25). If voltage is not as specified, check sensor mounting, wheel sensor air gap or incorrect or damaged toothed ring. Repair or replace components as necessary.
  25. LR Wheel Sensor Circuit Continuity Check Check for continuity between breakout box pins No. 4 and No. 40. If there is no continuity, go to step 27). If there is continuity, go to step 26).
  26. LR Wheel Sensor Continuity Check Disconnect left rear wheel sensor connector. Check for continuity between each wheel sensor terminal and body ground. If there is continuity at either terminal, replace wheel sensor. If there is no continuity at either terminal, repair circuit No. 518 or No. 519.
  27. ECM Ground Circuit Check Check for continuity between breakout box pin No. 40 and body ground. If there is continuity, go to step 28). If there is no continuity, repair circuit No. 530.
  28. Excessive Axle Vibration Check Check rear axle and housing for excessive play. Check toothed sensor ring for damage. Replace toothed sensor ring (if necessary). If no problem is found, reverify symptom.
  29. Code 45: 2 Missing Wheel Sensor Signals, One Is LF Turn ignition off. Install breakout box and adapter. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Measure voltage between breakout box pins No. 5 and No. 22, while rotating left front wheel one revolution per second. If voltage is not .05-.70 volt AC, check wheel sensor air gap, or for incorrect or damaged toothed ring. Repair or replace components as necessary. Perform same check at the following wheels and pins: RF - pins No. 3 and No. 20, RR - pins No. 6 and No. 23, and LR - pins No. 4 and No. 21. If voltages for all sensors are as specified, go to step 30).
  30. ECM Ground Circuit Check Check for continuity between break-out box pin No. 40 and body ground. If there is continuity, go to step 31). If there is no continuity, repair circuit No. 530.
  31. Excessive Wheel Bearing End Play Check for excessive wheel bearing end play on all wheels. Check toothed sensor ring for damage. Repair or replace components as necessary. If no problem is found, reverify symptom.
  32. Code 46: 2 Missing Wheel Sensor Signals, One Is RF Turn ignition off. Install breakout box and adapter. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Measure voltage between breakout box pins No. 3 and No. 20, while rotating right front wheel one revolution per second. If voltage is not .05-.70 volt AC, check wheel sensor air gap, or for incorrect or damaged toothed ring. Perform same check at the following wheels and pins: LF -pins No. 5 and No. 22, RR - pins No. 6 and No. 23, and LR - pins No. 4 and No. 21. If voltages for all sensors are as specified, go to step 30).
  33. Code 47: Missing Rear Wheel Sensor Signals Turn ignition off. Install breakout box and adapter. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Measure voltage between breakout box pins No. 6 and No. 23, while rotating right rear wheel one revolution per second. Perform same check between pins No. 4 and No. 21 for left rear wheel. If voltages are .05-.70 volt AC, go to step 30). If voltages are not as specified, check wheel sensor(s) for incorrect air gap or damaged toothed ring. Repair or replace components as necessary.
  34. Code 48: Missing 3-4 Wheel Sensor Signals Turn ignition off. Install breakout box and adapter. Open luggage compartment and turn air suspension switch off (if equipped). Raise and support vehicle. Measure voltage between breakout box pins No. 5 and No. 22, while rotating left front wheel one revolution per second. If voltage is .05-.70 volt AC, go to step 30). If voltage is not as specified, check wheel sensor air gap, or for incorrect or damaged toothed ring. Repair or replace components as necessary. Perform same check at the following wheels and pins:RF - pins No. 3 and No. 20, RR - pins No. 6 and No. 23, and LR -pins No. 4 and No. 21.
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