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Terminals Of Ecu

  1. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU ASSEMBLY WITH ACTUATOR) 
    Fig 1: Identifying Terminals Of ECU
    G04225937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL WIRE DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BM (S3-2) - GND1, 2 (S3-32, 1) B-R - W-B Motor relay test input Ignition switch ON, pump motor running 11 to 14 V
      FR+ (S3-3) - FR- (S3-17) BR-Y - BR Front RH wheel speed signal input Ignition switch ON, slowly turn right front wheel AC generation
      FL+ (S3-18) - FL- (S3-4) R - G Front LH wheel speed signal input Ignition switch ON, slowly turn left front wheel AC generation
      RR+ (S3-5) - RR- (S3-19) LG-B - LG-R Rear RH wheel speed signal input Ignition switch ON, slowly turn right rear wheel AC generation
      RL+ (S3-20) - RL- (S3-6) Y - B Rear LH wheel speed signal input Ignition switch ON, slowly turn left rear wheel AC generation
      NEO (S3-10) - GND1, 2 (S3-32, 1) V - W-B Engine rpm signal input Engine idling Pulse generation
      CANH (S3-11) - CANL (S3-25) B - W CAN communication line Ignition switch ON Pulse generation
      D/G (S3-13) - GND1, 2 (S3-32, 1) W - W-B Diagnostic communication line Ignition switch ON 11 to 14 V
      MRF (S3-14) - R+ (S3-45) B - R Fail-safe motor relay output Ignition switch ON 11 to 14 V
      MR (S3-15) - R+ (S3-45) L - R Ignition switch ON, pump motor running Motor relay output 11 to 14 V
      +BS (S3-31) - GND1, 2 (S3-32, 1) B - W-B Solenoid relay power supply Always 11 to 14 V
      STP (S3-27) - GND1, 2 (S3-32, 1) G-W - W-B Stop light input signal Stop light switch ON (Brake pedal depressed) 8 to 14 V
      Stop light switch OFF (Brake pedal released) Below 1.5 V
      PKB (S3-28) - GND1, 2 (S3-32, 1) B - W-B Parking brake switch input Ignition switch ON, parking brake switch ON Below 1.5 V
      Ignition switch ON, parking brake switch OFF 11 to 14 V
      WA (S3-29) - GND1, 2 (S3-32, 1) P - W-B ABS warning light output Ignition switch ON, ABS warning light ON 11 to 14 V
      Ignition switch ON, ABS warning light OFF Below 2.0 V
      Bz (S3-30) - GND1, 2 (S3-32, 1) R-W - W-B Buzzer output Ignition switch ON, VSC buzzer sounds Below 1.0 V
      Ignition switch ON, VSC buzzer does not sound 11 to 14 V
      IND (S3-34) - GND1, 2 (S3-32, 1) B-R - W-B SLIP input Ignition switch ON 11 to 14 V
      VSCW (S3-36) - GND1, 2 (S3-32, 1) BR-W - W-B VSC warning light output Ignition switch ON, VSC warning light ON Below 2.0 V
      Ignition switch ON, VSC warning light OFF 11 to 14 V
      WFSE (S3-42) - GND1, 2 (S3-32, 1) R - W-B WFSE input Ignition switch ON 11 to 14 V
      CSW (S3-43) - GND1, 2 (S3-32, 1) W-L - W-B TRAC OFF switch input TRAC OFF switch OFF 11 to 14 V
      BRL (S3-44) - GND1, 2 (S3-32, 1) B-Y - W-B Brake warning line output Ignition switch ON, brake warning light ON 11 to 14 V
      Ignition switch ON, brake warning light OFF Below 2.0 V
      R+ (S3-45) - GND1, 2 (S3-32, 1) R-W - W-B Power supply for motor relay Ignition switch ON, ABS warning light OFF 11 to 14 V
      IG1 (S3-46) - GND1, 2 (S3-32, 1) B-L - W-B IG1 power supply Ignition switch ON 11 to 14 V

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

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