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Terminals Of Ecu

WARNING: This page is about a different car, the 2010 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK 4WD CONTROL ECU 
    Fig 1: Identifying 4WD Control ECU
    GTY232020Courtesy 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
      F47-2 (4WDL) - F46-4 (GND) L - W-B Transfer indicator switch (L4 position) Ignition switch ON
      Transfer shift lever position H2 or H4      		 10.5 to 14 V
      Ignition switch ON
      Transfer shift lever position L4 or N      		 Below 1.5 V
      F47-3 (4WD) - F46-4 (GND) B - W-B Transfer indicator switch (4WD position) Ignition switch ON
      Transfer shift lever position H2      		 10.5 to 14 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N      		 Below 1.5 V
      F47-9 (DL1) - F46-4 (GND) LG - W-B A.D.D. actuator limit switch Ignition switch ON
      Transfer shift lever position H2      		 Below 1.5 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N      		 10.5 to 14 V
      F47-10 (DL2) - F46-4 (GND) GR - W-B A.D.D. actuator limit switch Ignition switch ON
      Transfer shift lever position H2      		 10.5 to 14 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N      		 Below 1.5 V
      F47-15 (ADD) - F46-4 (GND) W - W-B A.D.D. detection switch Ignition switch ON
      Transfer shift lever position H2      		 9.5 to 14 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N      		 Below 1.5 V
      F47-16 (NP) - F46-4 (GND) R - W-B Transfer indicator switch (Neutral position) Ignition switch ON
      Transfer shift lever position N      		 Below 1.5 V
      Ignition switch ON
      Transfer shift lever position not N      		 10.5 to 14 V
      F47-19 (CANH) - F46-4 (GND) G - W-B CAN communication line Ignition switch ON Pulse generation (See waveform 1)
      F47-20 (CANL) - F46-4 (GND) W - W-B CAN communication line Ignition switch ON Pulse generation (See waveform 2)
      F47-21 (L4) - F46-4 (GND) R - W-B Transfer L4 signal Ignition switch ON
      Transfer shift lever position H2 or H4      		 10 to 14 V
      Ignition switch ON
      Transfer shift lever position L4 or N      		 Below 1.5 V
      F46-1 (DM1) - F46-4 (GND) B - W-B A.D.D. actuator motor Ignition switch ON
      Transfer shift lever position H2 → H4, L4 or N (During operation of A.D.D. actuator motor from FREE to LOCK)      		 10 to 14 V
      Ignition switch ON
      Transfer shift lever position H2 → H4, L4 or N (A.D.D. actuator motor stopped)      		 Below 1.5 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
      F46-5 (DM2) - F46-4 (GND) Y - W-B A.D.D. actuator motor Ignition switch ON
      Transfer shift lever position H4, L4 or N → H2 (During operation of A.D.D. actuator motor from LOCK to FREE)      		 10 to 14 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N → H2 (A.D.D. actuator motor stopped)      		 Below 1.5 V
    2. Using an oscilloscope, check waveform 1.
      Fig 2: Identifying Waveform 1
      GTY218411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Waveform 1
      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

      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
      *1 Waveform 2
      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

      HINT: 

      The waveform varies depending on the CAN communication signal.

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