Wheel Sensor System Inspection

INSPECTION PROCEDURE

1. CONNECTOR INSPECTION 

   Disconnect the ABS actuator and electric unit (control unit) connector E125 and wheel sensor of malfunctioning code.

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

   OK or NG 

   OK: GO TO 2.

   NG: Repair or replace as necessary.

2. 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? 

   YES: GO TO 3.

   NO: Replace wheel sensor. Refer to "REMOVAL AND INSTALLATION ".

3. CHECK TIRES 

   Check for inflation pressure, wear and size of each tire.

   Are tire pressure and size correct and is tire wear within specifications? 

   YES: GO TO 4.

   NO: Adjust tire pressure or replace tire(s).

4. CHECK WHEEL BEARINGS 

   Check wheel bearing axial end play. Refer to "FRONT WHEEL BEARING " or "REAR WHEEL BEARING ".

   OK or NG 

   OK: GO TO 5.

   NG: Repair or replace as necessary. Refer to "FRONT WHEEL BEARING " or "REAR WHEEL BEARING ".

5. CHECK WIRING HARNESS FOR SHORT CIRCUIT 

   Check resistance between wheel sensor harness connector terminals and ground.

   Continuity should not exist. 

   OK or NG 

   OK: GO TO 6.

   NG: Repair the circuit.

   Fig 1: Identifying Resistance Between Wheel Sensor Harness Connector Terminals And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. CHECK WIRING HARNESS FOR OPEN CIRCUIT 

   Check continuity between ABS actuator and electric unit (control unit) harness connector and wheel sensor harness connector.

   CONTINUITY REFERENCE CHART
   
   

   Wheel sensor	ABS actuator and electric unit (control unit)		Wheel sensor		Continuity
   	Connector	Terminal	Connector	Terminal
   Front LH	E125	22	E18	1	Yes
   		7		2
   Front RH		24	E117	1
   		9		2
   Rear LH		11	B123	1
   		26		2
   Rear RH		13	B122	1
   		28		2

   Continuity should exist. 

   OK or NG 

   OK: Replace the ABS actuator and electric unit (control unit). Refer to "REMOVAL AND INSTALLATION ".

   NG: Repair the circuit.