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Diagnostic Procedure

  1. Test drive vehicle. Using scan tool, select DATA LIST. Monitor right rear wheel speed while decelerating from 35 MPH to zero. If wheel speed input matches remaining wheel speed inputs, right rear wheel speed sensor is currently functioning correctly. See DIAGNOSTIC AIDS  . If wheel speed input does not match remaining wheel speed inputs, go to next step.
  2. Raise and support right rear wheel. Inspect and measure wheel bearing end play. Ensure all components are in acceptable condition. Repair/replace components as needed. If all components are okay, go to next step.
  3. Turn ignition switch to LOCK position. Inspect speed sensor, wiring harness and applicable connections. Ensure all components are in acceptable condition. Repair as needed. If all components are okay, go to next step.
  4. Turn ignition off. Disconnect 2-pin floor harness-to-right rear ABS speed sensor harness connector L10. See Figure . Measure resistance between both terminals of 2-pin harness connector L40. See Figure . If resistance is 1050-1450 ohms at 68°F (20°C), go to next step. If resistance is not 1050-1450 ohms at 68°F (20°C), go to step  7 .
  5. Raise and support right rear wheel. Measure AC voltage between both terminals of 2-pin harness connector L40 while spinning wheel. See Figure . Voltage should be at least 100 mV. Voltage will increase with wheel speed. If voltage is as specified, go to next step. If voltage is not as specified, remove wheel speed sensor and inspect sensor ring for damage. Replace as needed. If sensor ring is okay, replace right rear wheel speed sensor.
  6. Measure resistance between ground and terminal No. 1 (Yellow/Black wire) of 2-pin harness connector L40. See Figure . If resistance measured is infinite, go to step  8 . If resistance measured is not infinite, disconnect 2-pin wheel speed sensor connector L42. See Figure . Measure resistance between ground and terminal No. 1 (Yellow/Black wire) of 2-pin harness connector L40. See Figure . If resistance measured is infinite, replace right rear wheel speed sensor. If resistance measured is not infinite, repair short to ground in Yellow wire or Yellow/Black wire.
  7. Disconnect 2-pin wheel speed sensor connector L42. See Figure . Measure resistance of Yellow and Yellow/Black wires between 2-pin connectors L40 and L42. See Figure . If resistance is less than 2 ohms for both circuits, replace right rear wheel speed sensor. If resistance is not less than 2 ohms for both circuits, repair open circuit in Yellow or Yellow/Black wire.
  8. Turn ignition switch to LOCK position. Disconnect EBCM 8-pin and 24-pin harness connectors. Turn ignition switch on. Measure voltage between ground and EBCM 24-pin harness connector terminals No. 2 (Yellow wire) and No. 13 (Yellow/Black wire). If voltage is less than one for both circuits, go to next step. If voltage is not less than one volt for either circuit, repair suspect circuit for short to voltage.
  9. Turn ignition to LOCK position. Measure resistance between ground and EBCM 24-pin harness connector terminals No. 2 (Yellow wire) and No. 13 (Yellow/Black wire). If resistance measured for both circuits is infinite, go to next step. If resistance measured on either circuit is not infinite, repair suspect circuit for short to ground.
  10. Check resistance of circuits between 2-pin harness connector L10 and EBCM 24-pin harness connector terminals No. 2 (Yellow wire) and No. 13 (Yellow/Black wire). If resistance is less than 2 ohms in both circuits, go to next step. If resistance is not less than 2 ohms in both circuits, repair suspect circuit for open or high resistance. Also check 14-pin floor harness connector L01 for poor connection and damaged terminals. See Figure .
  11. Check continuity between EBCM 24-pin harness connector terminals No. 2 (Yellow wire) and No. 13 (Yellow/Black wire). If continuity exists, repair short between Yellow wire and Yellow/Black wire. If continuity does not exist, check all connectors in circuit between EBCM and left rear wheel speed sensor. If connectors are okay, reconnect all components and repeat step  1 . If wheel speed input is not within 5 MPH of remaining wheel speed inputs or DTC is reset, replace EBCM.
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