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Terminals Of Ecu

  1. SKID CONTROL ECU 
    Fig 1: Identifying Skid Control ECU Connector Terminals
    G06003260Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINALS REFERENCE CHART

    Terminal No. (Symbol) Terminal Description
    1 (GND1) Skid control ECU ground
    2 (STP) Stop light switch input
    4 (RL-) Rear LH wheel speed signal input
    5 (RL+) Rear LH wheel speed sensor power supply
    6 (FR-) Front RH wheel speed signal input
    7 (FR+) Front RH wheel speed sensor power supply
    11 (SP1) Speed signal output for speedometer
    12 (+BS) Solenoid valve power supply
    13 (GND2) Motor ground
    14 (CANL) CAN communication line L
    16 (RR-) Rear RH wheel speed signal input
    17 (RR+) Rear RH wheel speed signal power supply
    18 (FL-) Front LH wheel speed signal input
    19 (FL+) Front LH wheel speed sensor power supply
    22 (STP2) Stop light control relay input
    24 (BM) Motor power supply
    25 (CANH) CAN communication line H
    27 (FSW+)*1 Brake pedal load sensing switch input
    29 (HDCS)*2 Downhill assist control switch input
    30 (CSW) VSC OFF switch input
    31 (STPO) Stop light control relay output
    33 (TS) Sensor diagnosis check input
    34 (IG1) ECU power supply
    HINT:
    *1: w/ Booster Failure Compensation
    *2: w/ Downhill Assist Control
  2. CHECK SKID CONTROL ECU 
    Fig 2: Identifying A19 Skid Control ECU Connector Terminals
    G06003261Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A19 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.

    HINT:

    The voltage cannot be measured with the connector connected to the skid control ECU as the connector is water resistant.

    Skid Control ECU: 

    TERMINALS REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A19-1 (GND1) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω
    A19-2 (STP) - Body ground L - Body ground Stop light switch input Stop light switch off Brake pedal released Below 1.5 V
    Stop light switch on Brake pedal depressed 8 to 14 V
    A19-12 (+BS) - Body ground W - Body ground Solenoid valve power supply Always 11 to 14 V
    A19-13 (GND2) - Body ground W-B - Body ground Motor ground Always Below 1 Ω
    A19-22 (STP2) - Body ground L - Body ground Stop light control relay input Stop light switch off Brake pedal released Below 1.5 V
    Stop light switch on Brake pedal depressed 8 to 16 V
    A19-24 (BM) - Body ground B - Body ground Motor power supply Always 11 to 14 V
    A19-27 (FSW+)*1 -Body ground P - Body ground Brake pedal load sensing switch input Brake pedal load sensing switch on
    Brake pedal not depressed beyond the specified point    		 192 to 234 Ω
    Brake pedal load sensing switch off
    Brake pedal depressed beyond the specified point    		 0.9 to 1.1 kΩ
    A19-29 (HDCS)*2 - Body ground Y - Body ground Downhill assist control switch input Downhill assist control switch on Below 1 Ω
    Downhill assist control switch off 10 kΩ or higher
    A19-30 (CSW) - Body ground L - Body ground VSC OFF switch input VSC OFF switch on Below 1 Ω
    VSC OFF switch off 10 kΩ or higher
    A19-31 (STPO) - Body ground W - Body ground Stop light control relay output Ignition switch ON 11 to 14 V
    A19-34 (IG1) - Body ground L - Body ground ECU power supply Ignition switch ON 11 to 14 V
    HINT:
    *1: w/ Booster Failure Compensation
    *2: w/ Downhill Assist Control
    If the result is not as specified, there may be a malfunction on the wire harness side.
  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 3: Identifying Instrument Panel Junction Block Connector Terminals
    G06003262Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ID junction block connector.
    2. Measure the resistance of the wire harness side connector.
      TERMINALS REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      ID-4 (PKB) - Body ground B - Body ground Parking brake switch input Parking brake switch on Below 1 Ω
      Parking brake switch off 10 kΩ or higher

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

    3. Reconnect the ID junction block connector.
    4. Measure the voltage of the wire harness side connector.
    TERMINALS REFERENCE CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    ID-4 (PKB) - Body ground B - Body ground Parking brake switch input Parking brake switch on Below 1 V
    Parking brake switch off 11 to 14 V

    If the result is not as specified, the junction block (main body ECU) may be a malfunction.

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