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Terminals Of Ecu

  1. CHECK DISTANCE CONTROL ECU 
    Fig 1: Identifying Distance Control ECU Connector Terminals
    G05005576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DISTANCE CONTROL ECU CONNECTOR TERMINALS VOLTAGE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    B - GND (A20-1 - A20-12) BR - R Battery Always 10 to 14 V
    CANH (A20 - 8) L CAN communication signal CAN communication circuit -
    CANL (A20 - 9) W CAN communication signal CAN communication circuit -
    SGND - Body ground (A20-10 - Body ground) R - Body ground Ground Always Below 1 V
    GND - Body ground (A20-12 - Body ground) R - Body ground Ground Always Below 1 V
    IGB - GND (A20-13 - A20-12) V - R Ignition switch ON signal Ignition switch OFF → ON (IG) Below 1 V → 10 to 14 V
    LRDD - GND (A20-22 - A20-12) B - R Laser sensor input signal Ignition switch ON (IG) Pulse generation (see  awaveform 1)
    LRRD - GND (A20-23 - A20-12) G - R Laser sensor output signal Ignition switch ON (IG) Pulse generation (see  bwaveform 2)
    1. Reference: waveform 1

      HINT:

      • Terminal: LRDD - GND
      • Gauge set: 2 V/DIV, 10 msec./DIV
      • Condition: Ignition switch ON
      Fig 2: Waveform Graph (Waveform 1)
      G05005577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Reference: waveform 2

      HINT:

      • Terminal: LRRD - GND
      • Gauge set: 2 V/DIV, 5 msec./DIV
      • Condition: Ignition switch ON
      Fig 3: Waveform Graph (Waveform 2)
      G05005578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK ECM 
    Fig 4: Identifying ECM Terminals
    G05005579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECM CONNECTOR TERMINALS VOLTAGE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    STP - E1 (A24-15 - B47-1) W - BR Stop light signal Brake pedal released (Stop light switch OFF) → Brake pedal depressed (Stop light switch ON) Below 1 V → 10 to 14 V
    CCS - E1 (D41-2 - B47-1) B-BR Cruise control main switch signal Ignition switch ON (IG) CANCEL switch ON SET / COAST switch ON RES / ACC switch ON Main switch ON 10 to 16 V 6.6 to 10.1 V 4.5 to 7.1 V 2.3 to 4.0 V
    Below 1 V
    ST1- - E1 (A24-16 - B47-1) GR - BR Stop light signal Ignition switch ON (IG) Brake pedal depressed (Stop light switch ON) → Brake pedal released (Stop light switch OFF) Below 1 V → 10 to 14 V
    CCHG - E1 (D41-4 - B47-1) Y - BR Distance control switch signal Ignition switch ON (IG) Cruise control main switch ON MODE switch ON → MODE switch OFF Below 1 V → 10 to 14 V
    LGND - Body ground (A24-31 - Body ground) BR - Body ground Ground Always Below 1 V
    E1 - Body ground (B47-1 - Body ground) BR - Body ground Ground Always Below 1 V

    If the value is not within the standard range, some defects on the vehicle is suspected.

  3. CHECK LASER SENSOR 
    Fig 5: Identifying Laser Sensor Connector Terminals
    G05005580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    LASER SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE SPECIFICATION

    Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition
    LGND - Body ground
    (A36-1 - Body ground)    		 BR - Body ground Distance signal Always Below 1 Ω
    SGND - Body ground
    (A36-2 - Body ground)    		 R - Body ground Ground Always Below 1 Ω
    LRDD - SGND (A36-3 - A36-2) B - R Laser radar sensor output signal Ignition switch: ON (IG) Pulse generation (see  awaveform 1)
    LRRD - SGND (A36-4 - A36-2) G - R Laser radar sensor input signal Ignition switch: ON (IG) Pulse generation (see  bwaveform 2)
    IGB - SGND (A36-5 - A36-2) V - R Ignition switch signal Ignition switch: ON (IG) 10 to 14 V
    1. Reference: waveform 1

      HINT:

      • Terminal: LRDD - SGND
      • Gauge set: 1 V/DIV, 2 msec./DIV
      • Condition: Ignition switch on (IG)
      Fig 6: Waveform Graph (Waveform 1)
      G05005581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Reference: waveform 2

      HINT:

      • Terminal: LRRD - SGND
      • Gauge set: 1 V/DIV, 2 msec./DIV
      • Condition: Ignition switch on (IG)
    Fig 7: Waveform Graph (Waveform 2)
    G05005582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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