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 TRANSFER CONTROL UNIT POWER SUPPLY (1)

Turn the ignition switch OFF.
Disconnect transfer control unit harness connector.

Check the voltage between transfer control unit harness connector and ground.

Transfer control unit

Voltage

(Approx.)

Connector

Terminal

E142

Ground

Battery voltage

Turn the ignition switch ON.
CAUTION: Never start the engine.

Check the voltage between transfer control unit harness connector and ground.

Transfer control unit

Voltage

(Approx.)

Connector

Terminal

E142

Ground

Battery voltage

Is the inspection result normal?

YES

GO TO 3 .

GO TO 2 .

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#59).
3. Check the harness for open or short between transfer control unit harness connector No. 1 terminal and fuse box.
Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit. Refer to the appropriate Wiring Diagram

NO

Repair or replace error-detected parts.

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)

Turn the ignition switch OFF.

Check the voltage between transfer control unit harness connector and ground.

Transfer control unit

Voltage

(Approx.)

Connector

Terminal

E142

Ground

0 V

Turn the ignition switch ON.
CAUTION: Never start the engine.

Check the voltage between transfer control unit harness connector and ground.

Transfer control unit

Voltage

(Approx.)

Connector

Terminal

E142

Ground

Battery voltage

Is the inspection result normal?

YES

GO TO 5 .

GO TO 4 .

CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)

Turn the ignition switch OFF.
Check the 10A fuse (#30).
Disconnect fuse block (J/B) harness connector.

Check the continuity between transfer control unit harness connector and fuse block (J/B) harness connector.

Fuse block (J/B)		Transfer control unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M69	1M	E142	4	Yes

Check the continuity between transfer control unit harness connector and the ground.

Transfer control unit		-	Continuity
Connector	Terminal
E142	4	Ground	No

Is the inspection result normal?

YES

Perform the trouble diagnosis for ignition power supply circuit. Refer to the appropriate Wiring Diagram

Repair or replace error-detected parts.

CHECK TRANSFER CONTROL UNIT GROUND

Turn the ignition switch OFF.

Check the voltage between transfer control unit harness connector and ground.

Transfer control unit		-	Voltage (Approx.)
Connector	Terminal
E142	2	Ground	0 V
	3

Check the continuity between transfer control unit harness connector and ground.

Transfer control unit		-	Continuity
Connector	Terminal
E142	2	Ground	Yes
	3

Is the inspection result normal?

YES

Inspection End.

Repair or replace error-detected parts.