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Terminals Of Ecu

  1. CHECK FOUR WHEEL DRIVE CONTROL ECU 
    Fig 1: Identifying 4WD Control ECU Connector Terminal Identification
    GTY365397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F47-1 (DL1) - F46-4 (GND) LG - W-B A.D.D. actuator limit switch Ignition switch ON
      Transfer position switch H2      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H4 or L4      		 10 to 14 V
      F47-2 (DL2) - F46-4 (GND) GR - W-B A.D.D. actuator limit switch Ignition switch ON
      Transfer position switch H4 or L4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2      		 10 to 14 V
      F47-3 (4WD) - F46-4 (GND) B - W-B Transfer indicator switch (for 4WD position) Ignition switch ON
      Transfer position switch H2      		 10 to 14 V
      Ignition switch ON
      Transfer position switch H4 or L4      		 Below 1.5 V
      F47-6 (TL1) - F46-4 (GND) G - W-B Transfer shift actuator limit switch Ignition switch ON
      Transfer position switch H2      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H4 or L4      		 10 to 14 V
      F47-7 (TL2) - F46-4 (GND) L - W-B Transfer shift actuator limit switch Ignition switch ON
      Transfer position switch H2 or L4      		 10 to 14 V
      Ignition switch ON
      Transfer position switch H4      		 Below 1.5 V
      F47-8 (TL3) - B-4 (GND) R - W-B Transfer shift actuator limit switch Ignition switch ON
      Transfer position switch H2 or H4      		 10 to 14 V
      Ignition switch ON
      Transfer position switch L4      		 Below 1.5 V
      F47-11 (2-4) - F46-4 (GND) W - W-B Transfer position switch Ignition switch ON
      Transfer position switch H2 or H4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch L4      		 10 to 14 V
      F47-13 (LO) - F46-4 (GND) B - W-B Transfer position switch Ignition switch ON
      Transfer position switch H4 or L4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2      		 10 to 14 V
      F47-14 (ADD) - F46-4 (GND) W - W-B A.D.D. detection switch Ignition switch ON
      Transfer position switch H4 or L4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2      		 10 to 14 V
      F47-16 (4WDL) - F46-4 (GND) L - W-B Transfer indicator switch (for L4 position) Ignition switch ON
      Transfer position switch L4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2 or H4      		 10 to 14 V
      F47-19 (CANH) - F46-4 (GND) G - W-B CAN communication line Ignition switch ON Pulse generation
      F47-20 (CANL) - F46-4 (GND) W - W-B CAN communication line Ignition switch ON Pulse generation
      F47-21 (L4) - F46-4 (GND) R - W-B Transfer L4 signal Ignition switch ON
      Transfer position switch L4      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2 or H4      		 10 to 14 V
      F46-2 (DM1) - F46-4 (GND) B - W-B A.D.D. actuator motor Ignition switch ON
      Transfer position switch H2 → H4, L4 (A.D.D. actuator motor stopped)      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H2 → H4, L4 (During operation of A.D.D. actuator motor from FREE to LOCK)      		 10 to 14 V
      F46-3 (IG) - F46-4 (GND) R - W-B IG power Ignition switch ON 11 to 14 V
      F46-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F46-6 (DM2) - F46-4 (GND) Y - W-B A.D.D. actuator motor Ignition switch ON
      Transfer position switch H4, L4 → H2 (A.D.D. actuator motor stopped)      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H4, L4 → H2 (During operation of A.D.D. actuator motor from LOCK to FREE)      		 10 to 14 V
      F46-7 (TM2) - F46-4 (GND) V - W-B Transfer shift actuator assembly Ignition switch ON
      Transfer position switch L4 → H4 (Transfer shift actuator motor stopped)      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch L4 → H4 (During operation of transfer shift actuator motor from LOW to HIGH)      		 10 to 14 V
      F46-8 (TM1) - F46-4 (GND) P - W-B Transfer shift actuator assembly Ignition switch ON
      Transfer position switch H4 → L4 (Transfer shift actuator motor stopped)      		 Below 1.5 V
      Ignition switch ON
      Transfer position switch H4 → L4 (During operation of transfer shift actuator motor from HIGH to LOW)      		 10 to 14 V
    2. Using an oscilloscope, check waveform 1.
      Fig 2: Identifying Waveform 1
      GTY218411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 1 (REFERENCE)

      Item Content
      Terminal No. (Symbols) F47-19 (CANH) - F46-4 (GND)
      Tool setting 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped and ignition switch ON
      TEXT IN ILLUSTRATION

      *1 Waveform 1

      HINT: 

      The waveform varies depending on the CAN communication signal.

    3. Using an oscilloscope, check waveform 2.
      Fig 3: Identifying Waveform 2
      GTY213004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 2 (REFERENCE)

      Item Content
      Terminal No. (Symbols) F47-20 (CANL) - F46-4 (GND)
      Tool setting 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped and ignition switch ON
      TEXT IN ILLUSTRATION

      *1 Waveform 2

      HINT: 

      The waveform varies depending on the CAN communication signal.

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