Transfer Case (DTC/Circuit Diagnosis)

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AWD SOLENOID POWER SUPPLY (1)

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

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

AWD control unit		--	Voltage
Connector	Terminal
B67	9	Ground	Battery voltage

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

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

AWD control unit		--	Voltage
Connector	Terminal
B67	9	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 3.

GO TO 2.

CHECK AWD SOLENOID POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10 A fuse (No. 62)
3. Check the harness for open or short between AWD control unit harness connector No. 9 terminal and 10 A fuse (No. 62).
Is the inspection result normal?

YES

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

NO

Repair or replace error-detected parts.

CHECK AWD SOLENOID GROUND

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

AWD control unit		--	Continuity
Connector	Terminal
B67	10	Ground	Yes
	11

Is the inspection result normal?

YES

GO TO 4.

Repair or replace error-detected parts.

CHECK AWD SOLENOID CIRCUIT (1)

Check the resistance between AWD control unit harness connector.

AWD control unit			Resistance (Approx.)
Connector	Terminal
B67	1	2	2.45 Ohm

Is the inspection result normal?

YES

GO TO 7.

GO TO 5.

CHECK AWD SOLENOID CIRCUIT (2)

Remove AWD solenoid harness connector.

Check the continuity between AWD control unit harness connector and AWD solenoid harness connector.

AWD control unit		AWD solenoid		Continuity
Connector	Terminal	Connector	Terminal
B67	1	C12	1	Yes
	2		2

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

AWD control unit		--	Continuity
Connector	Terminal
B67	1	Ground	No
	2

Is the inspection result normal?

YES

GO TO 6.

Repair or replace error-detected parts.

CHECK AWD SOLENOID
Check AWD solenoid. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 7.

NO

AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to Removal and Installation .
CHECK TERMINALS AND HARNESS CONNECTORS
- Check AWD control unit pin terminals for damage or loose connection with harness connector.
- Check AWD solenoid pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

Replace AWD control unit. Refer to Removal and Installation .

NO

Repair or replace error-detected parts.