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 "ATP SWITCH".
   DATA MONITOR REFERENCE
   
   

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

   Fig 1: CONSULT II Display DATA MONITOR Screen

   

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	40 - Ground	Vehicle stopped Engine running A/T selector lever "N" Brake pedal depressed	4WD shift switch: 4H to 4LO or 4LO to 4H (While actuator motor is operating.)	0V
   			Except the above	Battery voltage

OK or NG 

OK: GO TO  5.

NG: GO TO 2.

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

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the ATP switch harness connector.
3. Check continuity between transfer control unit harness connector E143 terminal 40 and ATP switch harness connector F55 terminal 8.

   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 M153 Terminal 40 And ATP Switch Connector F55 Terminal 8

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect ATP switch harness connector.
3. Check continuity between ATP switch harness connector F55 terminal 9 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 ATP Switch Connector F55 Terminal 9 And Ground

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect ATP switch harness connector.
3. Remove ATP switch. Refer to "LOCATION OF ELECTRICAL PARTS ".
4. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9.
   TERMINALS CONTINUITY CHART
   
   

   Terminal	Condition	Continuity
   8 - 9	Push ATP switch	Yes
   	Release ATP switch	No

OK or NG 

OK: GO TO 5.

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

Fig 5: Checking Continuity Between ATP Switch Terminals 8 And 9

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.

1. Turn ignition switch "ON". (Do not start engine.)
2. Move A/T selector lever to "P" position.
3. Set 4WD shift switch from "4H" to "4LO" or "4LO" to "4H".

Does ATP warning lamp turn ON while switching? 

Yes: GO TO "ATP WARNING LAMP TURNS ON ".

No: Inspection End.