Diagnosis Procedure

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

1. CONNECTOR INSPECTION 
   1. Disconnect ABS actuator and electric unit (control unit) connector and brake fluid level switch connector.
   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 HARNESS BETWEEN BRAKE FLUID LEVEL SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
   1. Check continuity between ABS actuator and electric unit (control unit) connector E125 (A) terminal 8 and brake fluid level switch connector E21 (B) terminal 1.

      ABS actuator and electric unit (control unit)		Brake fluid level switch		Continuity
      Connector	Terminal	Connector	Terminal
      E125 (A)	8	E21 (B)	1	Yes

      Fig 1: Checking Continuity Between ABS Actuator & Electric Unit & Ground

      Courtesy of NISSAN NORTH AMERICA, INC.
   2. Check continuity between ABS actuator and electric unit (control unit) connector E125 (A) terminal 8 and ground.

      ABS actuator and electric unit (control unit)		-	Continuity
      Connector	Terminal
      E125 (A)	8	Ground	No

      Is the inspection result normal? 

      YES: GO TO 3

      NO: Repair or replace malfunctioning components.

3. CHECK BRAKE FLUID LEVEL SWITCH GROUND 

   Check continuity between brake fluid level switch connector E21 terminal 2 and ground.

   Brake fluid level switch		-	Continuity
   Connector	Terminal
   E21	2	Ground	Yes

   Fig 2: Checking Brake Fluid Level Switch Ground Circuit Continuity

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: GO TO 4

   NO: Repair or replace malfunctioning components.

4. CHECK BRAKE FLUID LEVEL SWITCH 

   Perform the brake fluid level switch component inspection. Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: Perform self-diagnosis again. If the same results appear, replace ABS actuator and electric unit (control unit). Refer to "REMOVAL AND INSTALLATION ".

   NO: Replace brake fluid level switch.