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Terminals Of Ecu

  1. CHECK COMBINATION METER ASSEMBLY 
    Fig 1: Identifying ECU Terminals
    G05113960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using the tester probes, touch the terminals from the back of the vehicle wire harness connectors, and measure the voltages and resistances.

      Standard: 

      ECU TERMINALS VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (E13-2) - Body ground R-L - Body ground Ignition switch signal Ignition switch OFF → ON Below 1 V → 11 to 14 V
      B (E13-1) - Body ground R - Body ground Battery Always 11 to 14 V
      KSW (E13-9) - Body ground V-G - Body ground Key unlock warning switch signal input Key inserted → Key removed from ignition key cylinder Below 1 V → 10 to 14 V
      DOOR (E13-29) - Body ground W-L - Body ground Driver door courtesy switch signal input Driver door closed → open Below 1 V → 11 to 14 V
      ES (E13-21) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

  2. CHECK MAIN BODY ECU 
    Fig 2: Identifying Main Body ECU Connector Terminals (1 Of 2)
    G05113967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Identifying Main Body ECU Connector Terminals (2 Of 2)
    G05113810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using the tester probes, touch the terminals from the back of the vehicle wire harness connectors, and measure the voltages.

      Standard voltage: 

      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (E8-14) - Body ground G-Y - Body ground Key unlock warning switch input Key inserted → Key removed from ignition key cylinder Below 1 V → to 14 V
      GND1, 2 (1H-2) - Body ground W-B - Body ground Ground Always Below 1V
      BECU (1B-4) - Body ground W-R - Body ground Battery Always to 14 V
      DCTY (E7-23) - Body ground R-B - Body ground Driver door courtesy switch input Driver door closed → open to 14 V → Below 1 V
      KSWO (E8-15) - Body ground V-G - Body ground Key unlock warning switch signal output Key inserted → Key removed from ignition key cylinder Below 1 V → to 14 V
      DCY2 (E8-11) - Body ground W-L - Body ground Driver door courtesy switch signal output Driver door closed → open 10 to 14 V → Below 1 V

      If the result is not as specified, there may be a malfunction in the wire harness.

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