Diagnostic Procedure

Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC PROCEDURE ".

Is the "4WD MOD SW [P1814]" (with CONSULT-II) or "Flickering pattern: 16" (without CONSULT-II) detected? 

YES: Perform trouble diagnosis for 4WD shift switch. Refer to "4WD SHIFT SWITCH ".

NO: GO TO 2

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 "2-4WD SOL" and "2-4WD SOL MON".
   DISPLAY VALUE CONDITION
   
   

   Monitored item	Condition		Display value
   2-4WD SOL	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD	OFF
   		4WD shift switch: AUTO	ON
   		4WD shift switch: 4H
   		4WD shift switch: 4LO
   		4WD shift switch: AUTO ("Wait" function is operating.)	OFF
   		4WD shift switch: 4H ("Wait" function is operating.)	OFF
   2-4WD SOL MON	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD	OFF
   		4WD shift switch: AUTO	ON
   		4WD shift switch: 4H
   		4WD shift switch: 4LO
   		4WD shift switch: AUTO ("Wait" function is operating.)	OFF
   		4WD shift switch: 4H ("Wait" function is operating.)	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.)
   M152	1 - Ground	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD	0V
   			4WD shift switch: AUTO, 4H or 4LO	Battery voltage

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

OK or NG 

OK: GO TO  7.

NG: GO TO 3.

1. Turn ignition switch "ON". (Do not start engine.)
2. Check voltage between transfer control unit harness connector terminals and ground.
   CONNECTOR TERMINAL VOLTAGE REFERENCE
   
   

   Connector	Terminal	Condition	Voltage (Approx.)
   M141	4 - ground	4WD shift switch: AUTO, 4H or 4LO	Battery voltage
   		4WD shift switch: 2WD	0V

   Fig 3: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground

   

OK or NG 

OK: GO TO 4.

NG: Check 4WD shift switch. Refer to "COMPONENT INSPECTION ".

1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect 4WD shift switch harness connector and transfer terminal cord assembly harness connector.
3. Check continuity between 4WD shift switch harness connector M141 terminal 4 and transfer terminal cord assembly harness connector F56 terminal 5.

   Continuity should exist. 

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

   Fig 4: Checking Continuity Between 4WD Shift Switch And Transfer Terminal Cord Assembly

   

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 control unit harness connector and transfer terminal cord assembly harness connector.
3. Check continuity between transfer control unit harness connector M152 terminal 1 and transfer terminal cord assembly harness connector F56 terminal 4.

   Continuity should exist. 

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

   Fig 5: Checking Continuity Between Transfer Control Unit And Transfer Terminal Cord Assembly

   

OK or NG 

OK: GO TO 6.

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 resistance between transfer terminal cord assembly terminals 4 and 5.

   4 - 5 : Approx. 22.8 - 25.2 Ω 

   Fig 6: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 4 And 5

   

OK or NG 

OK: GO TO 7.

NG: 2-4WD solenoid is malfunctioning. 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 8.

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 ".