Nissan Sentra B18 (2020-2025) Service Manual: Power Supply and Ground Circuit

Diagnosis Procedure

1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY

   1. 1. Ignition switch OFF.

      2. Disconnect ABS actuator and electric unit (control unit) harness connector.

      3. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	6	Ground	0 V

      4. Ignition switch ON.

         Note:

         Start the engine.

      5. Check the voltage between ABS actuator and electric unit (control unit) harness connectors and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	6	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   GO TO 2.

2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT

   1. 1. Ignition switch OFF.

      2. Check the 10A fuse (#1).

      3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal 6 and 10A fuse (#1).

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for ignition power supply.

   NO >>

   Repair / replace harness, connector, or fuse.

3. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY

   1. 1. Ignition switch OFF.

      2. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	1	Ground	Battery voltage

      3. Ignition switch ON.

         Note:

         Start the engine.

      4. Check the voltage between ABS actuator and electric unit (control unit) harness connectors and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	1	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   GO TO 4.

4. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

   1. 1. Ignition switch OFF.

      2. Check the 50A fusible link (#C).

      3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal 1 and 50A fusible link (#C).

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for battery power supply.

   NO >>

   Repair / replace harness, connector, or fusible link.

5. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY

   1. 1. Ignition switch OFF.

      2. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	25	Ground	Battery voltage

      3. Ignition switch ON.

         Note:

         Start the engine.

      4. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

         (+)		(—)	Voltage (Approx.)
         ABS actuator and electric unit (control unit)
         Connector	Terminal
         E33	25	Ground	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 7.

   NO >>

   GO TO 6.

6. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY CIRCUIT

   1. 1. Ignition switch OFF.

      2. Check the 30A fuse (#75).

      3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal 25 and 30A fuse (#75).

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for battery power supply.

   NO >>

   Repair / replace harness, connector, or fusible link.

7. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT

   1. Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

      ABS actuator and electric unit (control unit)		—	Continuity
      Connector	Terminal
      E33	13	Ground	Yes
      	38

   Is the inspection result normal?

   YES >>

   GO TO 8.

   NO >>

   Repair / replace harness, connector, or terminal.

8. CHECK TERMINAL

   1. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.

   Is the inspection result normal?

   YES >>

   Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation.

   NO >>

   Repair / replace harness, connector, or terminal.

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