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Terminals Of Ecu

  1. TERMINALS OF ECU 
    Fig 1: Identifying ECU Connector Terminals
    G06026062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Text in Illustration 

    ILLUSTRATION LEGEND

    *1 Component without harness connected (Brake Actuator (Skid Control ECU))
    TERMINAL DESCRIPTION REFERENCE

    Terminal No. (Symbol) Terminal Description
    1 (GND2) Pump motor ground
    2 (+BM) Motor relay power supply
    3 (+BS) Solenoid relay power supply
    4 (GND1) Skid control ECU ground
    5 (FL-) Front wheel speed LH (-) signal input
    6 (RL+) Rear wheel speed LH (+) signal input
    8 (RR+) Rear wheel speed RH (+) signal input
    9 (FR+) Front wheel speed RH (+) signal input
    10 (FR-) Front wheel speed RH (-) signal input
    11 (D/G) Diagnosis tester communication line
    13 (STP2) Stop light control relay input
    14 (CANL) CAN communication line L
    16 (TS) Sensor check input
    17 (CSW) VSC OFF switch input
    20 (FSW+) Brake pedal load sensing switch input
    26 (FL+) Front wheel speed LH (+) signal input
    27 (RL-) Rear wheel speed LH (-) signal input
    28 (IG1) ECU power supply
    29 (RR-) Rear wheel speed RH (-) signal input
    30 (STP) Stop light switch input
    33 (SP1) Speed signal output for speedometer
    35 (CANH) CAN communication line H
    39 (STP0) Stop light control relay output
    42 (BZ) Skid control buzzer output
  2. TERMINAL INSPECTION 
    1. Disconnect the connector and measure the voltage and resistance on the wire harness side.
      Fig 2: Identifying A42 Connector Terminals
      G06026063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Text in Illustration 

      ILLUSTRATION LEGEND

      *1 Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

      HINT:

      Voltage cannot be measured with the connector connected to the skid control ECU because the connector is watertight.

      Standard 

      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A42-1 (GND2) - Body ground W-B - Body ground Pump motor ground Always Below 1 Ω
      A42-2 (+BM) - Body ground Y - Body ground Motor relay power supply Always 11 to 14 V
      A42-3 (+BS) - Body ground GR - Body ground Solenoid relay power supply Always 11 to 14 V
      A42-4 (GND1) - Body ground W - Body ground Skid control ECU ground Always Below 1 Ω
      A42-13 (STP2) - Body ground R - Body ground Stop light control relay input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V → Below 1.5 V
      A42-17 (CSW) - Body ground LG - Body ground VSC OFF switch input VSC OFF switch held ON → OFF (Not pressed) Below 1 Ω → 10 kΩ or higher
      A42-20 (FSW+) - Body ground R - Body ground Brake pedal load sensing switch input Brake pedal load sensing switch OFF → ON (Brake pedal depressed → released) 950 to 1050 → 203 to 223 Ω
      A42-28 (IG1) - Body ground GR - Body ground ECU power supply Ignition switch ON 11 to 14 V
      A42-30 (STP) - Body ground P - Body ground Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V → Below 1.5 V
      A42-39 (STP0) - Body ground BR - Body ground Stop light control relay output Ignition switch ON 11 to 14 V
      A42-42 (BZ) - Body ground L - Body ground Skid control buzzer output Ignition switch ON, when buzzer not sounding 6 to 10 V
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