Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect AWD control unit harness connector.
3. Check the voltage between AWD control unit harness connector and ground.

   AWD control unit		-	Voltage
   Connector	Terminal
   M105	9	Ground	Battery voltage

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Perform the trouble diagnosis for power supply circuit. Refer to "DIAGNOSIS PROCEDURE ".

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

Is the inspection result normal? 

YES: GO TO 3.

NO: Repair or replace error-detected parts.

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

   AWD control unit		AWD solenoid		Continuity
   Connector	Terminal	Connector	Terminal
   M105	1	F57	1	Existed
   	2		2

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

   AWD control unit		-	Continuity
   Connector	Terminal
   M105	1	Ground	Not existed
   	2

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Repair or replace error-detected parts.

Check the resistance between AWD solenoid harness connector terminals. Refer to "COMPONENT INSPECTION ".

Is the inspection result normal? 

YES: GO TO 5.

NO: AWD solenoid is malfunctioning. Replace electric controlled coupling. Refer to "VQ37VHR: EXPLODED VIEW " (VQ37VHR), "VK50VE: EXPLODED VIEW " (VK50VE).

1. Check AWD control unit pin terminals for damage or loose connection with harness connector.
2. 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 "EXPLODED VIEW ".

   NO: Repair or replace error-detected parts.