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Terminals Of Ecu

  1. TERMINALS OF ECU 
    Fig 1: Identifying A13 Skid Control ECU Connector Terminals
    G05297031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINAL REFERENCE CHART

    Symbols (Terminal No.) Terminal Description
    GND (1) Skid control ECU ground
    BS1 (2) FR, RL linear solenoid switching valve (SMC1, SS) power supply
    FRA+ (3) FR pressure increase linear solenoid (+) output
    FRR+ (4) FR pressure decrease linear solenoid (+) output
    SMC1 (5) Master cut solenoid 1 output
    BZ (6) Skid control buzzer output
    SP1 (7) Speed signal output to combination meter
    ENA (8) Capacitor signal output
    PCK1 (9) Pressure sensor 1 stuck check output
    FRO (10) FR wheel speed signal output
    RL+ (11) RL wheel speed sensor power supply output
    RL- (12) RL wheel speed sensor input
    CTY+ (13) Start power supply input (Door)
    PMC1 (14) Master cylinder pressure sensor 1 signal input
    FR+ (15) FR wheel speed sensor power supply output
    IG1 (16) IG1 power supply
    FRR- (17) FR pressure decrease linear solenoid (-) output
    FRA- (18) FR pressure increase linear solenoid (-) output
    RLR- (19) RL pressure decrease linear solenoid (-) output
    MR1 (20) Motor relay 1 power supply output
    CBI1 (21) Capacitor power supply input 1
    VBZ (22) Skid control buzzer power supply output
    FAIL (23) Capacitor signal input
    TS (25) Signal check (Test mode) input
    PAC1 (26) Accumulator pressure sensor 1 signal input
    VCM (27) Pressure sensor 1 power supply output
    FR- (28) FR wheel speed sensor input
    +B (29) Start power supply input (STP)
    R1+ (30) Main relay 1 power supply output
    BSO3 (31) Stroke simulator cut solenoid power supply output
    BSO1 (32) SMC1 power supply output
    RLA+ (33) RL pressure increase linear solenoid (+) output
    RLR+ (34) RL pressure decrease linear solenoid (+) output
    RLA- (35) RL pressure increase linear solenoid (-) output
    R1- (36) Motor relay 1 output
    MTT (37) Motor relay test input
    DO1 (38) +B output 1
    DI1 (39) +B input 1
    SS (40) Stroke simulator cut solenoid output
    PRL (42) RL wheel cylinder pressure sensor signal input
    E (43) Pressure sensor 1 ground
    PFR (44) FR wheel cylinder pressure sensor signal input
    STP (45) Stop light switch input
    R3+ (46) Main relay 1 output
    Fig 2: Identifying A14 Skid Control ECU Connector Terminals
    G05297032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINAL REFERENCE CHART

    Symbols (Terminal No.) Terminal Description
    SKS2 (1) Brake pedal stroke sensor signal 2 input
    SKS (3) Brake pedal stroke sensor signal 1 input
    SKG (4) Brake pedal stroke sensor ground
    VCSK (5) Brake pedal stroke sensor power supply output
    Fig 3: Identifying A15 Skid Control ECU Connector Terminals
    G05297033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ECU TERMINAL REFERENCE CHART

    Symbols (Terminal No.) Terminal Description
    GND4 (1) Skid control ECU ground
    BS2 (2) FL, RR linear solenoid switching valve (SMC2) power supply
    FLA+ (3) FL pressure increase linear solenoid (+) output
    FLR+ (4) FL pressure decrease linear solenoid (+) output
    SMC2 (5) Master cut solenoid 2 output
    PCK2 (6) Pressure sensor 1 stuck check output
    CANH (8) CAN communication line H
    FLO (9) FL wheel speed signal output
    RR+ (10) RR wheel speed sensor power supply output
    LBL (11) Brake fluid level warning switch input
    PMC2 (12) Master cylinder pressure sensor 2 signal input
    FL+ (13) FL wheel speed sensor power supply output
    IG2 (14) IG2 power supply
    FLR- (15) FL pressure decrease linear solenoid (-) output
    FLA- (16) FL pressure increase linear solenoid (-) output
    RRA- (17) RR pressure increase linear solenoid (-) output
    R2- (18) Motor relay 2 output
    CANL (19) CAN communication line L
    PKB (20) Parking brake switch input
    RR- (23) RR wheel speed sensor input
    VCM2 (24) Pressure sensor 2 power supply output
    FL- (25) FL wheel speed sensor input
    R2+ (26) Main relay 2 power supply output
    BSO2 (28) SMC2 power supply output
    RRA+ (29) RR pressure increase linear solenoid (+) output
    RRR+ (30) RR pressure decrease linear solenoid (+) output
    RRR- (31) RR pressure decrease linear solenoid (-) output
    MR2 (32) Motor relay 2 power supply output
    DI2 (33) +B input 2
    DO2 (34) +B output 2
    CBI2 (35) Capacitor power supply input 2
    CSW (36) VSC OFF switch input
    PRR (37) RR wheel cylinder pressure sensor signal input
    E2 (38) Pressure sensor 2 ground
    PFL (39) FL wheel cylinder pressure sensor signal input
    R4+ (40) Main relay 2 output
  2. TERMINAL INSPECTION 
    1. Disconnect the connector and measure the voltage or resistance on the wire harness side.
      Fig 4: Identifying A13 And A15 Skid Control ECU Connector Terminals
      G05297034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

      ECU TERMINAL REFERENCE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (A13-1) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω
      IG1 (A13-16) - Body ground B-Y - Body ground IG1 power supply Engine switch on (IG) 10 to 14 V
      +B (A13-29) - Body ground G-R - Body ground Start power supply input (STP) Always 10 to 14 V
      DI1 (A13-39) - Body ground GR - Body ground +B input 1 Always 10 to 14 V
      STP (A13-45) - Body ground R-W - Body ground Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V → Below 1.5 V
      GND4 (A15-1) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω
      LBL (A15-11) - Body ground Y-B - Body ground Brake fluid level warning switch input Brake fluid level is minimum level → maximum level 1.9 to 2.1 kΩ → Below 1 Ω
      IG2 (A15-14) - Body ground B-W - Body ground IG2 power supply Engine switch on (IG) 10 to 14 V
      PKB (A15-20) - Body ground Y-R - Body ground Parking brake switch input Engine switch on (IG), parking brake switch ON → OFF Below 1.5 V → 10 to 14 V
      DI2 (A15-33) - Body ground B - Body ground +B input 2 Always 10 to 14 V
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