Inspection Procedure

HINT:

If the center differential cannot change from FREE to LOCK or LOCK to FREE, inspect and repair the touch select 2-4 and high-low system first.

1. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if a CAN communication system DTC is output (See DIAGNOSIS SYSTEM ).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      DTC is not output	A
      DTC is output	B

   B: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: Go to Next Step 

2. PERFORM ACTIVE TEST USING TECHSTREAM (VSC OFF INDICATOR LIGHT) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream ON.
   4. Select the Active Test mode and operate the VSC OFF indicator light using the Techstream.

      ABS/VSC/TRAC 

      DATA LIST REFERENCE
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      VSC Warning Light	VSC OFF indicator light	Indicator light ON/OFF	Observe combination meter

   5. Check that the VSC OFF indicator light turns on and off in the combination meter when using the Techstream.

      OK: The VSC OFF indicator light turns ON and OFF in accordance with the Techstream operation. 

      HINT:

      When the VSC OFF indicator light remains illuminated, there may be an open in the wire harness of the combination meter or abnormalities in the meter circuit.

   NG: GO TO METER / GAUGE SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   OK: Go to Next Step 

3. INSPECT VSC OFF SWITCH 
   1. Remove the VSC OFF switch (See REMOVAL  ).
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Switch Condition	Specified Condition
      6-9	Switch is pressed	Below 1 Ω
      	Switch is not pressed	10 kΩ or higher

   NG: REPLACE VSC OFF SWITCH  (See REMOVAL  )

   Fig 1: Identifying VSC OFF Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH) 
   1. Disconnect the A19 ECU connector.
   2. Disconnect the H29 switch connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      A19-13 (CSW) - H29-9	Always	Below 1 Ω
      A19-13 (CSW) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 2: Identifying A19 ECU Connector Terminal And H29 Switch Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE VSC ACTUATOR ASSEMBLY  (See REMOVAL  )