Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Check the vacuum sensor harness connector for disconnection or looseness.
3. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
Is the inspection result normal?

YES

GO TO 3.

NO

Repair / replace harness or connector. GO TO 2.

CHECK VACUUM SENSOR POWER SUPPLY

Turn the ignition switch OFF.
Disconnect vacuum sensor harness connector.

Check the voltage between vacuum sensor harness connector and ground.

Vacuum sensor

Voltage

(Approx.)

Connector

Terminal

E51

Ground

0 V

Turn the ignition switch ON.
NOTE: Start the engine.

Check the voltage between vacuum sensor harness connector and ground.

Vacuum sensor

Voltage

(Approx.)

Connector

Terminal

E51

Ground

5 V

Is the inspection result normal?

YES

GO TO 4.

GO TO 3.

CHECK VACUUM SENSOR POWER SUPPLY CIRCUIT

Turn the ignition switch OFF.
Disconnect ABS actuator and electric unit (control unit) harness connector.

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

Vacuum sensor		ABS actuator and electric unit (control unit)		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E51	3	E26	5	Yes

Check the continuity between vacuum sensor harness connector and ground.

Vacuum sensor		-	Continuity
Connector	Terminal
E51	3	Ground	No

Is the inspection result normal?

YES

GO TO 4.

Repair / replace harness or connector.

CHECK VACUUM SENSOR GROUND CIRCUIT

Turn the ignition switch OFF.

Check the continuity between vacuum sensor harness connector and ground.

Vacuum sensor		-	Continuity
Connector	Terminal
E51	2	Ground	No

Is the inspection result normal?

YES

GO TO 5.

Repair / replace harness or connector.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT
Check the ABS actuator and electric unit (control unit) power supply and ground circuits. Refer to Diagnosis Procedure .

Is the inspection result normal?

YES

GO TO 6.

NO

Repair / replace harness, connector, fuse, or fusible link.
CHECK TERMINAL
1. Check the vacuum sensor pin terminals for damage or loose connection with harness connector.
2. 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.