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 "SHIFT POS SW1" and "SHIFT POS SW2".
   DISPLAY VALUE CONDITION
   
   

   Monitored item	Condition		Display value
   SHIFT POS SW1	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO	ON
   		4WD shift switch: 2WD, AUTO or 4H	OFF
   SHIFT POS SW2	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H, AUTO or 2WD	ON
   		4WD shift switch: 4LO	OFF

   Fig 1: Identifying CONSULT-II Display - DATA MONITOR

   

Without CONSULT-II 

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

   Connector	Terminal	Condition		Voltage (Approx.)
   M153	27 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H, AUTO or 2WD	0V
   			4WD shift switch: 4LO	Battery voltage
   	44 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO	0V
   			4WD shift switch: 2WD, AUTO or 4H	Battery voltage

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

   

OK or NG 

OK: GO TO  5.

NG: GO TO 2.

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer control device (actuator position switch) harness connector.
3. Check continuity between the following terminals.
   • Transfer control unit harness connector M153 terminal 27 and transfer control device (actuator position switch) harness connector F58 terminal 23.
   • Transfer control unit harness connector M153 terminal 44 and transfer control device (actuator position switch) harness connector F58 terminal 20.

     Continuity should exist. 

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

     Fig 3: Checking Continuity Between Transfer Control Unit Connector Terminals And Transfer Control Device Connector Terminals

     

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 control device (actuator position switch) harness connector.
3. Check continuity between transfer control device (actuator position switch) harness connector F58 terminal 22 and ground.

   Continuity should exist. 

   Also check harness for short to power.

Fig 4: Checking Continuity Between Transfer Control Device Connector F58 And Ground

OK or NG 

OK: GO TO 4.

NG: Repair open circuit or short to power in harness or connectors.

1. Remove transfer control device. Refer to "REMOVAL AND INSTALLATION ".
2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.
   CAUTION:

   • Do not operate actuator motor for more than 1 second.
   • Change the actuator motor position to "HIGH" when installing.
   • Be careful not to overheat the harness.
   CONNECTOR TERMINAL VOLTAGE REFERENCE
   
   

   Terminal	Continuity	Continuity
   24 (Battery voltage) - 21 (Ground)	20 - 22	YES
   	22 - 23	NO
   21 (Battery voltage) - 24 (Ground)	22 - 23	YES
   	20 - 22	NO

   Fig 5: Applying Battery Voltage To Transfer Control Device (Actuator Motor) Terminals 21 And 24

   

OK or NG 

YES: GO TO 5.

NO: Replace transfer control device. Refer to "REMOVAL AND INSTALLATION ".

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

OK or NG 

OK: GO TO 6.

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 device. Refer to "REMOVAL AND INSTALLATION ".