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Terminals Of Ecu

  1. TERMINALS OF ECU 
    Fig 1: Identifying Skid Control ECU Connector Terminal
    G05556483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION CHART

    Terminal No. (Symbol) Terminal Description
    1 (GND1) Skid control ECU ground
    2 (+BM1) Power supply for motor
    3 (FR+) Front wheel speed sensor RH power supply output
    4 (FL-) Front wheel speed sensor LH input
    5 (RR+) Rear wheel speed sensor RH power supply output
    6 (RL-) Rear wheel speed sensor LH input
    7 (STP) Stop light switch input
    10 (NEO)(1) Center diff. lock indicator light input
    11 (CANH) CAN communication line H
    12 (SP1) Speed signal output to combination meter
    13 (D/G) Diagnosis tester communication line
    14 (P) Shift position indicator P signal input
    15 (INFR) AUTO LSD indicator light output
    16 (STPO) Stop light operation relay output
    17 (FR-) Front wheel speed sensor RH input
    18 (FL+) Front wheel speed sensor LH power supply output
    19 (RR-) Rear wheel speed sensor RH input
    20 (RL+) Rear wheel speed sensor LH power supply output
    21 (EXI4) 4WD control switch (L4) input(2)
    A.D.D. (Auto disconnected differential lock) actuator switch input(3)
    24 (TS) Sensor test terminal (Signal check switch) input
    25 (CANL) CAN communication line L
    26 (EXI3) A.D.D. (Auto disconnected differential lock) actuator switch input(2)
    Rear differential lock indicator switch input(3)
    27 (EXI)(1) Center diff. lock switch input
    28 (PKB) Parking brake switch input
    29 (WA) ABS warning light output
    30 (BZ) Skid control buzzer output
    31 (+BS) Power supply for solenoid
    32 (GND2) Skid control ECU ground
    33 (HDCW) Downhill assist control indicator light output(2)
    A-TRAC indicator light output(3)
    34 (IND) SLIP indicator light output
    36 (VSCW) VSC OFF indicator light output
    37 (FRO) Front RH wheel speed output
    38 (FLO) Front LH wheel speed output
    41 (LBL) Brake fluid level warning switch input
    42 (WFSE) Write flash enable input
    43 (CSW) VSC OFF switch input
    44 (HDCS) Downhill assist control switch input(2)
    A-TRAC switch input(3)
    45 (STP2) Stop light switch input
    46 (IG1) IG1 power supply
    (1) for 4WD
    (2) for 4WD w/o A-TRAC Switch
    (3) for 4WD w/ A-TRAC Switch
    Fig 2: Identifying Skid Control ECU Connector Terminal
    G05556484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION CHART

    Terminal No. (Symbol) Terminal Description
    1 (IG2) IG2 power supply
    2 (+BM2) Power supply for motor
    3 (BRL) BRAKE warning light output
    4 (GND3) Skid control ECU ground
  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 3: Identifying S28 And S29 Skid Control ECU Connector Terminal
    G05556485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION CHART

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    S28-2 (+BM1) - S28-1 (GND1) Y-B - W-B Power supply for motor (from battery) Always 11 to 14 V
    S28-7 (STP) - S28-1 (GND1) G-B - W-B Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V → Below 1.5V
    S28-14 (P) - S28-1 (GND1) G-B - W-B Shift position indicator P signal input Ignition switch ON, shift position P → any shift position except P 8 to 14 V → Below 1.5 V
    S28-28 (PKB) - S28-1 (GND1) LG - W-B Parking brake switch input Ignition switch ON, parking brake switch ON → OFF Below 1.5 V → 10 to 14 V
    S28-31 (+BS) - S28-1 (GND1) Y - W-B Power supply for solenoid (from battery) Always 11 to 14 V
    S28-41 (LBL) - S28-1 (GND1) LG - W-B Brake fluid level warning switch input Brake fluid level is +/- 5 mm (+/- 0.197 in.) from the minimum level → maximum level Below 1 Ω → 1.9 to 2.1 kΩ
    S28-45 (STP2) - S28-1 (GND1) G-Y - W-B Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V → Below 1.5 V
    S28-46 (IG1) - S28-1 (GND1) B-R - W-B IG1 power supply Ignition switch off → ON Below 1 V → 10 to 14V
    S29-1 (IG2) - S29-4 (GND3) B-O - W-B IG2 power supply Ignition switch off → ON Below 1 V → 10 to 14 V
    S29-2 (+BM2) - S29-4 (GND3) Y-B - W-B Power supply for motor (from battery) Always 11 to 14 V
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