Inspection Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit connector E125 and wheel sensor of malfunctioning code.

Check the terminals for deformation, disconnection, looseness or damage.

OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace as necessary.
CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Connect ABS active wheel sensor tester (J-45741) to wheel sensor using appropriate adapter.
2. Turn on the ABS active wheel sensor tester power switch.
  NOTE: The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the battery in the ABS active wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel sensor tester. The red SENSOR indicator should flash on and off to indicate an output signal.
  NOTE: If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and retest.
Does the ABS active wheel sensor tester detect a signal?
1. Yes: GO TO 3.
2. No: Replace wheel sensor. Refer to "REMOVAL AND INSTALLATION ".
CHECK TIRES
Check for inflation pressure, wear and size of each tire.

Are tire pressure and size correct and is tire wear within specifications?
1. Yes: GO TO 4.
2. No: Adjust tire pressure or replace tire(s).
CHECK WHEEL BEARINGS
Check wheel bearing axial end play. Refer to AXLE SHAFTS Front or REAR AXLE .

OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace as necessary. Refer to AXLE SHAFTS Front or REAR AXLE .
CHECK WIRING HARNESS FOR SHORT CIRCUIT
1. Check resistance between wheel sensor harness connector terminals and ground.
  
  Fig 1: Checking Resistance Between Wheel Sensor Harness Connector Terminals And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
Continuity should not exist .

OK or NG
1. OK: GO TO 6.
2. NG: Repair the circuit.
CHECK WIRING HARNESS FOR OPEN CIRCUIT
1. Check continuity between ABS actuator and electric unit (control unit) harness connector and wheel sensor harness connector.
  
  Fig 2: Continuity Conditions Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
Continuity should exist .

OK or NG
1. OK: Replace the ABS actuator and electric unit (control unit). Refer to "REMOVAL AND INSTALLATION ".
2. NG: Repair the circuit.