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4WD Control ECU Communication Stop Mode [12/2015 - 08/2016]: Procedure

  1. PRECAUTION 
    NOTE:

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Refer to PRECAUTION [12/2015 - 08/2016] ).

    Result: 

    NEXT 

    See step  2

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [12/2015 - 08/2016] )

    Result: 

    NEXT 

    See step  3

  3. CHECK CAN BUS LINE FOR DISCONNECTION (4WD ECU ASSEMBLY BRANCH WIRE) 
    1. Disconnect the 4WD ECU assembly connector.
      GTY727394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      K1-14 (CANH) - K1-16 (CANL) Ignition switch off 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to 4WD ECU Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD ECU ASSEMBLY (CAN-H, CAN-L) 

    Result: 

    OK 

    See step  4

  4. CHECK WIRE HARNESS (4WD ECU ASSEMBLY - POWER SOURCE) 
    1. Connect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [12/2015 - 08/2016] )

    2. Disconnect the 4WD ECU assembly connector.
      GTY686415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below

      Standard Resistance

      Tester Connection Condition Specified Condition
      K1-23 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      K1-9 (BSLC) - Body ground Always 11 to 14 V
      K1-11 (IG1) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to 4WD ECU Assembly)

    Result: 

    OK 

    REPLACE 4WD ECU ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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