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Terminals Of Ecu

  1. TERMINALS OF ECU 
    Fig 1: Identifying Skid Control ECU Connector Terminal Identification
    GTY309354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TEXT IN ILLUSTRATION

    *a Component without harness connected
    (Skid Control ECU)
    Terminal No. (Symbol) Terminal Description
    A4-1 (GND1) Skid control ECU ground
    A4-2 (+BM1) Power supply for motor
    A4-3 (FR+) Front right wheel speed sensor power supply output
    A4-4 (FL-) Front left wheel speed sensor input
    A4-5 (RR+) Rear right wheel speed sensor power supply output
    A4-6 (RL-) Rear left wheel speed sensor input
    A4-7 (STP) Stop light switch
    A4-9 (CSW) VSC OFF switch
    A4-11 (CANH) CAN communication terminal H
    A4-12 (SP1) Speedometer signal
    A4-13 (ATRC) A-TRAC switch*6
    A4-14 (P) Neutral start switch*2
    A4-16 (STPO) Stop light operation relay
    A4-17 (FR-) Front right wheel speed sensor input
    A4-18 (FL+) Front left wheel speed sensor power supply output
    A4-19 (RR-) Rear right wheel speed sensor input
    A4-20 (RL+) Rear left wheel speed sensor power supply output
    A4-24 (TS) Sensor test terminal (Signal check switch)
    A4-25 (CANL) CAN communication terminal L
    A4-27 (EXI) L4 detection switch*1*2
    LL detection switch*3
    A4-28 (PKB) Parking brake switch
    A4-29 (EXI4) A.D.D. detection switch*1*2
    Center differential lock detection switch*3
    A4-31 (+BS) Power supply for solenoid
    A4-32 (GND2) Skid control ECU ground
    A4-40 (EXI3) Rear differential lock detection switch*4
    IG power supply*5
    A4-41 (LBL) Brake fluid level warning switch
    A4-43 (NEO) Ground (Indicates 2WD or 4WD vehicle)*1
    A4-45 (STP2) Stop light switch
    A4-46 (IG1) IG1 power supply
    A5-1 (IG2) IG2 power supply
    A5-2 (+BM2) Power supply for motor (from battery)
    A5-4 (GND3) Ground
    • *1: for 4WD
    • *2: for Automatic Transmission
    • *3: for Manual Transmission
    • *4: w/ Rear Differential Lock
    • *5: w/o Rear Differential Lock
    • *6: w/ A-TRAC
  2. TERMINAL INSPECTION 

    Disconnect the connector and measure the voltage or resistance on the wire harness side.

    HINT: 

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

    Fig 2: Skid Control ECU Wiring Harness Connector Terminal Identification
    GTY309459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TEXT IN ILLUSTRATION

    *a Front view of wire harness connector
    (Skid Control ECU)
    STANDARD

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A4-1 (GND1) - Body ground W-B Ground Always Below 1 Ω
    A4-2 (+BM1) - Body ground L-Y Power supply for motor (from battery) Always 11 to 14 V
    A4-7 (STP) - Body ground G-B Stop light switch Brake pedal depressed → released 8 to 14 V → Below 1.5 V
    A4-9 (CSW) - Body ground R-L VSC OFF switch VSC OFF switch off → on and held 10 kΩ or higher → Below 1 Ω
    A4-13 (ATRC) - Body ground*6 P-G A-TRAC switch input A-TRAC switch off → on and held 10 kΩ or higher → Below 1 Ω
    A4-14 (P) - Body ground*2 Y-B Neutral start switch Ignition switch ON
    shift P position → any shift position except P    		 8 to 14 V → Below 1.5 V
    A4-16 (STPO) - Body ground B-L Stop light operation relay Ignition switch off → ON Below 1 V → 11 to 14 V
    A4-27 (EXI) - Body ground*1*2 W-L L4 detection switch Ignition switch ON
    Transfer condition L4    		 Below 1 V
    Ignition switch ON
    Transfer condition except L4    		 11 to 14 V
    A4-27 (EXI) - Body ground*3 W-L LL detection switch Ignition switch ON
    Transfer condition LL    		 Below 1 V
    Ignition switch ON
    Transfer condition except LL    		 11 to 14 V
    A4-28 (PKB) - Body ground W-R Parking brake switch Parking brake switch off → on 10 kΩ or higher → Below 1 Ω
    A4-29 (EXI4) - Body ground *1*2 GR ADD detection switch Ignition switch ON
    Transfer condition H4 or L4    		 Below 1.5 V
    Ignition switch ON
    Transfer condition H2    		 11 to 14 V
    A4-29 (EXI4) - Body ground*3 GR Center differential lock detection switch Ignition switch ON
    Transfer condition LL or HL    		 Below 1.5 V
    Ignition switch ON
    Transfer condition H    		 11 to 14 V
    A4-31 (+BS) - Body ground Y Power supply for solenoid (from battery) Always 11 to 14 V
    A4-32 (GND2) - Body ground W-B Ground Always Below 1 Ω
    A4-40 (EXI3) - Body ground*4 L-Y Rear differential lock detection switch Ignition switch ON
    differential lock switch ON    		 Below 1.5 V
    Ignition switch ON
    differential lock switch OFF    		 11 to 14 V
    A4-40 (EXI3) - Body ground*5 L-Y IG power supply Ignition switch off → ON Below 1 V → 11 to 14 V
    A4-41 (LBL) - Body ground V-R Brake fluid level warning switch Brake fluid level +/-5 mm (+/-0.197 in.) from minimum level → maximum level Below 1 Ω → 1.9 to 2.1 kΩ
    A4-43 (NEO) - Body ground*1 P-L Ground Always Below 1 Ω
    A4-45 (STP2) - Body ground G-Y Stop light switch Brake pedal depressed → released 8 to 14 V → Below 1.5 V
    A4-46 (IG1) - Body ground B-R IG1 power supply Ignition switch off → ON Below 1 V → 11 to 14 V
    A5-1 (IG2) - Body ground B-O IG2 power supply Ignition switch off → ON Below 1 V → 11 to 14 V
    A5-2 (+BM2) - Body ground L-Y Power supply for motor (from battery) Always 11 to 14 V
    A5-4 (GND3) - Body ground W-B Ground Always Below 1 Ω
    • *1: for 4WD
    • *2: for Automatic Transmission
    • *3: for Manual Transmission
    • *4: w/ Rear Differential Lock
    • *5: w/o Rear Differential Lock
    • *6: w/ A-TRAC
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