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 "4L POSI SW".
   DISPLAY VALUE CONDITION
   
   

   Condition		Display value
   Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO	ON
   	Except the above	OFF

   Fig 1: Identifying CONSULT II - DATA MONITOR Screen

   

   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.)
   E142	24 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO	0V
   			Except the above	Battery voltage

   Fig 2: Checking Voltage Between Transfer Control Unit 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 4LO switch harness connector.
3. Check continuity between transfer control unit harness connector M152 terminal 24 and 4LO switch harness connector F60 terminal 13.

   Continuity should exist. 

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

   Fig 3: Checking Continuity Between Transfer Control Unit Connector M152 Terminal 24 And 4Lo Switch Connector F60 Terminal 13

   

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 4LO switch harness connector.
3. Check continuity between 4LO switch harness connector F60 terminal 12 and ground.

   Continuity should exist. 

   Also check harness for short to power.

   Fig 4: Checking Continuity Between 4LO Switch Connector F60 Terminal 12 And Ground

   

OK or NG 

OK: GO TO 4.

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

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect 4LO switch harness connector.
3. Remove 4LO switch. Refer to "LOCATION OF ELECTRICAL PARTS ".
4. Push and release 4LO switch and check continuity between 4LO switch terminals 12 and 13.
   CONNECTOR TERMINAL CONTINUITY REFERENCE
   
   

   Terminal	Condition	Continuity
   12 - 13	Push 4LO switch	Yes
   	Release 4LO switch	No

Fig 5: Checking Continuity Between 4LO Switch Terminals 12 And 13

OK or NG 

OK: GO TO 5.

NG: Replace 4LO switch. Refer to "LOCATION OF ELECTRICAL PARTS ".

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 unit. Refer to "REMOVAL AND INSTALLATION ".