Diagnosis Procedure

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

CHECK FUSE AND FUSIBLE LINK

Check that the following fuse and fusible link are not blown:

Signal name	Fuse or Fusible Link No. or Letter
Ignition switch ON or START	29 (5A)
Battery power supply (with Cummins 5.0L)	B (60A)
Battery power supply (with VK56VD)	AA (60A)

Is the fuse or fusible link blown?

YES

Replace the blown fuse or fusible link after repairing the affected circuit.

GO TO 2.

CHECK INVERTER RELAY
Check inverter relay. Refer to Component Inspection (Inverter Relay) .

Is the inspection result normal?

YES

GO TO 3 .

NO

Replace inverter relay.

CHECK INVERTER UNIT POWER SUPPLY CIRCUIT

Connect inverter relay connector.
Disconnect inverter unit connector B2.
Connect a fused jumper wire between inverter unit connector B2 and ground.
Turn ignition switch ON.

Check voltage between inverter unit connector B1 and ground.

Inverter unit

Ground

Voltage

(Approx.)

Connector

Terminal

Battery voltage

Is the inspection result normal?

YES

GO TO 7.

GO TO 4.

CHECK INVERTER RELAY POWER SUPPLY CIRCUITS

Turn ignition switch OFF.
Disconnect inverter relay connector E59.

Check voltage between inverter relay connector E59 and ground.

Inverter relay

Ground

Voltage

(Approx.)

Connector

Terminal

E59

Battery voltage

Turn ignition switch ON.

Check voltage between inverter relay connector E59 and ground.

Inverter relay		Ground	Condition	Voltage (Approx.)
Connector	Terminal
E59	2	-	Ignition switch ON	Battery voltage
			Ignition switch OFF	0V

Is the inspection result normal?

YES

GO TO 5.

Repair or replace the inverter relay power supply circuit.

CHECK INVERTER UNIT POWER SUPPLY CIRCUIT FOR OPEN

Turn ignition switch OFF.
Disconnect inverter unit connector B1.
Check continuity between inverter relay connector E59 and inverter unit connector B1.

Inverter relay		Inverter unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E59	3	B1	14	Yes

Is the inspection result normal?

YES

GO TO 6.

Repair or replace the harness or connectors.

CHECK INVERTER RELAY COIL CIRCUIT FOR OPEN

Check continuity between inverter relay connector E59 and inverter unit connector B1.

Inverter relay		Inverter unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E59	1	B1	11	Yes

Is the inspection result normal?

YES

GO TO 7.

Repair or replace the harness or connectors.

CHECK INVERTER UNIT GROUND CIRCUIT

Turn ignition switch OFF.

Check continuity between inverter unit connector B1 and ground.

Inverter unit		Ground	Continuity
Connector	Terminal
B1	13	-	Yes

Is the inspection result normal?

YES

Inspection End.

Repair or replace the inverter unit ground circuit.