Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CONNECTOR INSPECTION 
   1. Disconnect the ABS actuator and electric unit (control unit) connector and wheel sensor of malfunctioning code.
   2. Check the terminals for deformation, disconnection, looseness or damage.

      Is the inspection result normal? 

      YES: GO TO 2

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

3. CHECK TIRES 

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

   Is the inspection result normal? 

   YES: GO TO 4

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

4. CHECK WHEEL BEARINGS 

   Check wheel bearing axial end play. Refer to "ON-VEHICLE INSPECTION AND SERVICE " (front) or "ON-VEHICLE INSPECTION AND SERVICE " (rear).

   Is the inspection result normal? 

   YES: GO TO 5

   NO: Repair or replace as necessary. Refer to "UNIT REMOVAL AND INSTALLATION " (front) or "UNIT REMOVAL AND INSTALLATION " (rear).

5. CHECK WIRING HARNESS FOR SHORT CIRCUIT 
   1. Disconnect ABS actuator and electric unit (control unit) connector and wheel sensor connector of malfunction code.
   2. Check continuity between wheel sensor connector terminals and ground.

      Continuity should not exist. 

      Fig 1: Checking Wiring Harness For Short Circuit

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 6

      NO: Repair the circuit.

6. CHECK WIRING HARNESS FOR OPEN CIRCUIT 
   1. Check continuity between ABS actuator and electric unit (control unit) connector and the malfunctioning wheel sensor connector.

      Wheel sensor	ABS actuator and electric unit (control unit)		Wheel sensor		Continuity
      	Connector	Terminal	Connector	Terminal
      Front LH	E125	45	E18	2	Yes
      		46		1
      Front RH		34	E117	2
      		33		1
      Rear LH		37	C11	1
      		36		2
      Rear RH		42	C10	1
      		43		2

      Is the inspection result normal? 

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

      NO: Repair the circuit.