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 "WAIT DETCT SW".
   DATA MONITOR REFERENCE
   
   

   Condition		Display value
   Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	OFF
   	4WD shift switch: 4H to 4LO (While actuator motor is operating.)	OFF → ON
   	4WD shift switch: 4LO to 4H (While actuator motor is operating.)	ON → OFF
   	4WD shift switch: 4LO	ON

   Fig 1: CONSULT-II Display - DATA MONITOR

   

Without CONSULT-II 

1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
   TERMINALS VOLTAGE CHART
   
   

   Connector	Terminal	Condition		Voltage (Approx.)
   E143	43 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	Battery voltage
   			4WD shift switch: 4H to 4LO (While actuator motor is operating.)	Battery voltage → 0V
   			4WD shift switch: 4LO to 4H (While actuator motor is operating.)	0V → Battery voltage
   			4WD shift switch: 4LO	0V

   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 wait detection switch harness connector.
3. Check continuity between transfer control unit harness connector E143 terminal 43 and wait detection switch harness connector F59 terminal 10.

   Continuity should exist. 

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

OK or NG 

OK: GO TO 3.

NG: Repair or replace damaged parts.

Fig 3: Checking Continuity Between Transfer Control Unit Connector Terminal And Wait Detection Switch Connector Terminal

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Check continuity between wait detection switch harness connector F59 terminal 11 and ground.

   Continuity should exist. 

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

OK or NG 

OK: GO TO 4.

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

Fig 4: Checking Continuity Between Wait Detection Switch Harness Connector F59 Terminal 11 And Ground

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Remove wait detection switch. Refer to "LOCATION OF ELECTRICAL PARTS ".
4. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.
   TERMINALS CONTINUITY CHART
   
   

   Terminal	Condition	Continuity
   10 - 11	Push wait detection switch	Yes
   	Release wait detection switch	No

OK or NG 

OK: GO TO 5.

NG: Replace wait detection switch. Refer to "LOCATION OF ELECTRICAL PARTS ".

Fig 5: Checking Continuity Between Wait Detection Switch Terminals 10 And 11

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 ".