Diagnosis System [10/2018 - 09/2020]

Four wheel drive control system data can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. Therefore when there seems to be a problem with the four wheel drive control system, use the Techstream or SST to check and troubleshoot it.

1. Inspect the battery voltage.

   Standard Voltage

   11 to 14 V

   If the voltage is below 11 V, recharge the battery before proceeding.

2. Check the DLC3.

   Refer to GENERAL INFORMATION [09/2014 - ]

1. If a malfunction occurs during system operation, "Check AWD System" will be displayed on the multi-information display to inform the driver of the system malfunction.

   HINT: 

   Check that the master warning light comes on for approximately 4 seconds.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine switch on (IG), and check that the master warning light comes on for approximately 3 seconds.

   HINT: 

   The master warning light goes off while the system is in DTC output mode.

1. Check AWD warning.
   1. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3 (to enter DTC output mode).

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of DLC3

      • SST: 09843-18040 
   2. Turn the engine switch on (IG).
   3. "DIAG AWD" is displayed on the multi-information display, and the 4WD ECU assembly checks the system for malfunctions.
      • If the AWD control system is normal, "DIAG AWD FF" will be displayed on the multi-information display.
      • If the AWD control system is not normal, "DIAG AWD XX (DTC)" will be displayed on the multi-information display.
      • Although Test Mode is not set for the AWD control system, a message will be displayed on the multi-information display when Test Mode is activated for checking the VSC, etc.

      HINT: 

      • Test mode DTCs will not be stored because test mode is not set.
      • If the systems above are not displayed on the multi-information display, there may be a malfunction in the TC and CG terminal circuit.

        Refer to TC and CG Terminal Circuit [10/2018 - 09/2020]

      • If the AWD warning check result is not normal, proceed to troubleshooting for the AWD warning circuit.

      Trouble Area	See Procedure
      AWD warning remains on	Refer to AWD Warning Remains ON [09/2014 - 09/2020]
      AWD warning does not come on	Refer to AWD Warning does not Come ON [09/2014 - 09/2020]

1. If the following malfunctions occur, the 4WD ECU assembly will stop or partially change the AWD control system function.

   Malfunction	Control
   Malfunction in a speed sensor	System function is stopped
   Malfunction in the steering sensor and throttle signal line	System function is partially changed