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 "DUTY SOLENOID".
   DISPLAY VALUE CONDITION
   
   

   Condition		Display value
   Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD	4%
   	4WD shift switch: AUTO	96 - 4%
   	4WD shift switch: 4H or 4LO	4%

   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.)
   M152	10 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: AUTO	4 - 14V
   			4WD shift switch: 2WD, 4H or 4LO	Less than 1V
   	19 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: AUTO	1.5 - 3V
   			4WD shift switch: 2WD, 4H or 4LO	Less than 1V

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

   

OK or NG 

OK: GO TO  8.

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 transfer control unit harness connector M152 terminal 19 and transfer terminal cord assembly harness connector F56 terminal 6.

   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

   

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 and transfer dropping resistor harness connector.
3. Check continuity between transfer dropping resistor harness connector E135 terminal 2 and transfer terminal cord assembly harness connector F56 terminal 6.

   Continuity should exist. 

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

   Fig 4: Checking Continuity Between Transfer Dropping Resistor And Transfer Terminal Cord Assembly

   

OK or NG 

OK: GO TO 4.

NG: Repair or replace damaged parts.

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer dropping resistor harness connector.
3. Check continuity between transfer control unit harness connector M152 terminal 10 and transfer dropping resistor harness connector E135 terminal 1.

   Continuity should exist. 

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

   Fig 5: Checking Continuity Between Transfer Control Unit Connector Terminal And Transfer Dropping Resistor Connector Terminal

   

OK or NG 

OK: GO TO 5.

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 continuity between transfer terminal cord assembly harness connector F56 terminal 19 and ground.

   Continuity should exist. 

   Also check harness for short to power.

Fig 6: Checking Continuity Between Transfer Terminal Cord Assembly Harness Connector F56 Terminal 19 And Ground

OK or NG 

OK: GO TO 6.

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 transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly harness connector F56 terminals 6 and 19.

   6 - 19 : Approx. 3.0 - 3.4 Ω 

   Fig 7: Checking Resistance Between Transfer Terminal Cord Assembly Harness Connector F56 Terminals 6 And 19

   

OK or NG 

OK: GO TO 7.

NG: Replace clutch pressure solenoid. Refer to "DISASSEMBLY AND ASSEMBLY ".

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer dropping resistor harness connector.
3. Check resistance between transfer dropping resistor terminals 1 and 2.

   1 - 2 : Approx. 11.2 - 12.8 Ω 

   Fig 8: Checking Resistance Between Transfer Dropping Resistor Terminals 1 And 2

   

OK or NG 

OK: GO TO 8.

NG: Replace transfer dropping resistor. 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 9.

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 ".