Diagnostic Procedure

With CONSULT-II 

1. Start engine.
2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
3. Read out the value of "FLUID TEMP SE".
   DISPLAY VALUE CONDITION
   
   

   Condition	Display value (Approx.)
   Transfer fluid temperature approx. 20 - 80°C (68 - 176°F)	1.1 - 0.3V

   Fig 1: Identifying CONSULT-II Display - DATA MONITOR

   

Without CONSULT-II 

1. Start engine.
2. Check voltage between transfer control unit harness connector terminals and ground.
   CONNECTOR TERMINAL VOLTAGE REFERENCE
   
   

   Connector	Terminal	Condition		Data (Approx.)
   M153	28 - Ground	Always		0V
   	31 - Ground	Ignition switch: ON	Transfer fluid temperature approx. 20°C (68°F)	1.1V
   			Transfer fluid temperature approx. 80°C (176°F)	0.3V

   Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground

   

OK or NG 

OK: GO TO  4.

NG: GO TO 2.

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connector.
3. Check continuity between the following terminals.
   • Transfer control unit harness connector M153 terminal 28 and transfer terminal cord assembly harness connector F56 terminal 3.
   • Transfer control unit harness connector M153 terminal 31 and transfer terminal cord assembly harness connector F56 terminal 2.

     Continuity should exist. 

     Also check harness for short to ground and short to power.

     Fig 3: Checking Continuity Between Transfer Control Unit And Transfer Terminal Cord Assembly Connector

     

OK or NG 

OK: GO TO 3.

NG: Repair or replace damaged parts.

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly terminals 2 and 3.
   CONNECTOR TERMINAL RESISTANCE REFERENCE
   
   

   Temperature °C (°F)	Resistance (Approx.)
   20 (68)	2.5 kΩ
   80 (176)	0.3 kΩ

Fig 4: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 2 And 3

OK or NG 

OK: GO TO 4.

NG: Replace transfer fluid temperature sensor. Refer to "DISASSEMBLY AND ASSEMBLY ".

Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

OK or NG 

OK: GO TO 5.

NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

Perform the self-diagnosis, after driving a vehicle for a while.

OK or NG 

OK: Inspection End.

NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".