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Terminals Of Ecu

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  1. CHECK COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Terminals Of ECU - Combination Meter Assembly
    G05586146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connector.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (E19-21) - Body ground B - Body ground Ignition switch signal Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V
      B (E19-22) - Body ground R - Body ground Battery Always 10 to 14 V
      CANH (E19-32) - Body ground G - Body ground CAN communication line Ignition switch ON Pulse generation
      CANL (E19-31) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      ET (E19-33) - Body ground BR - Body ground Ground Always Below 1 Ω
  2. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 2: Identifying Instrument Panel Junction Block (Main Body ECU) Connector Terminals
    G05586147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (IE-26) - Body ground L - Body ground Key unlock warning switch input Key inserted Below 1 V
      Key removed from ignition key cylinder 10 to 14 V
      GND1 (IE-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
      BECU (IB-30) - Body ground R - Body ground Battery Always 10 to 14 V
      DCTY (IA-21) - Body ground W - Body ground Driver door courtesy switch input Driver door closed 10 to 14 V
      Driver door open Below 1 V
      CANL (E17-16) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      CANH (E17-15) - Body ground R - Body ground CAN communication line Ignition switch ON Pulse generation