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Terminals Of Ecu

  1. TERMINALS OF ECU 
    Fig 1: Identifying Skid Control ECU Terminals
    G05579788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION REFERENCE

    Symbols (Terminal No.) Terminal Description
    GND1 (1) Skid control ECU ground
    +BM1 (2) Power supply for motor
    FR+ (3) Front right wheel speed sensor power supply output
    FL- (4) Front left wheel speed signal input
    RR+ (5) Rear right wheel speed sensor power supply output
    RL- (6) Rear left wheel speed signal input
    STP (7) Stop light switch input
    NEO (10) (1) 2WD/4WD change over switch input
    CANH (11) CAN communication line H
    SP1 (12) (2) Speed signal output for combination meter
    D/G (13) Diagnosis tester communication line
    P (14) (2) Shift position indicator P signal input
    INFR (15) (3) AUTO LSD indicator light output
    STPO (16) Stop light operated relay output
    FR- (17) Front right wheel speed sensor input
    FL+ (18) Front left wheel speed sensor power supply output
    RR- (19) Rear right wheel speed sensor input
    RL+ (20) Rear left wheel speed sensor power supply output
    EXI4 (21) (4) Transfer indicator switch (L4) input
    TS (24) Sensor test terminal (Sensor check switch) input
    CANL (25) CAN communication line L
    EXI3 (26) (5) Rear differential lock position switch input
    EXI (27) (4) Transfer indicator switch (A/T: 4WD position, M/T: center differential lock position) input
    PKB (28) Parking brake switch input
    WA (29) ABS warning light input
    BZ (30) Skid control buzzer output
    +BS (31) Power supply for solenoid
    GND2 (32) Skid control ECU ground
    HDCW (33) (6) A-TRAC indicator light output
    IND (34) SLIP indicator light output
    WT (35) (7) VSC OFF indicator light output
    VSCW (36) VSC TRAC warning light output
    LBL (41) Brake fluid level warning switch input
    WFSE (42) Write flash enable input
    CSW (43) (3) AUTO LSD switch input
    HDCS (44) (6) A-TRAC switch input
    STP2 (45) Stop light switch input
    IG1 (46) IG1 power supply
    (1) 4WD with Automatic Transmission
    (2) Automatic Transmission
    (3) with AUTO LSD
    (4) 4WD
    (5) with rear differential lock
    (6) with A-TRAC
    (7) 4WD or 2WD with rear differential lock
    Fig 2: Identifying Skid Control ECU A5 Connector Terminal
    G05112237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION REFERENCE

    Symbols (Terminal No.) Terminal Description
    IG2 (1) IG2 power supply
    +BM2 (2) Power supply for motor
    BRL (3) BRAKE warning light output
    GND3 (4) 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 Skid Control ECU A4 And A5 Connector Terminal
    G05579790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard 

    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    +BM1 (A4-2) - GND1, GND2 (A4-1, 32) L-Y - W-B Power supply for motor from battery Always 11 to 14 V
    1G1 (A4-46) - GND1, GND2 (A4-1, 32) B-R - W-B IG1 power supply IG switch OFF Below 1 V
    IG1 (A4-46) - GND1, GND2 (A4-1, 32) B-R - W-B IG1 power supply IG switch ON 11 to 14 V
    STP (A4-7) - GND1, GND2 (A4-1, 32) G-B - W-B Stop light switch input Stop light switch OFF (Brake pedal released) Below 1.5 V
    STP (A4-7) - GND1, GND2 (A4-1, 32) G-B - W-B Stop light switch input Stop light switch ON (Brake pedal released) 8 to 14 V
    p (A4-14) - GND1, GND2 (A4-1, 32) (*1) Y-B - W-B Shift position indicator P signal input IG switch ON, shift P position 8 to 14 V
    p (A4-14) - GND1, GND2 (A4-1, 32) (*1) Y-B - W-B Shift position indicator P signal input IG switch ON, any shift position except P Below 1 V
    EXI4 (A4-21) - GND1, GND2 (A4-1, 32)(*1)(*2) W-L - W-B Transfer indicator switch (L4) input IG switch ON, transfer position L4 Below 1.5 V
    EXI4 (A4-21) - GND1, GND2 (A4-1, 32)(*1)(*2) W-L - W-B Transfer indicator switch (L4) input IG switch ON, transfer condition except L4 8 to 14 V
    EXI3 (A4-26) - GND1, GND2 (A4-1, 32)(*3) L-Y - W-B Rear differential lock detection switch input IG switch ON, rear differential lock switch ON Below 1.5 V
    EXI3 (A4-26) - GND1, GND2 (A4-1, 32)(*3) L-Y - W-B Rear differential lock detection switch input IG switch ON, rear differential lock switch OFF 8 to 14 V
    EXI (A4-27) - GND1, GND2 (A4-1, 32)(*2) GR - W-B Transfer indicator switch (A/T; 4WD position, M/T: center differential lock position) input A/T: IG switch ON, transfer condition H4 or L4
    M/T: IG switch ON, transfer condition LL or HL    		 Below 1.5 V
    EXI (A4-27) - GND1, GND2 (A4-1, 32)(*2) GR - W-B Transfer indicator switch (A/T: 4WD position, MAT: center differential lock position) input A/T: IG switch ON, transfer condition H2 M/T: IG switch ON, transfer condition H 8 to 14 V
    PKB (A4-28) - GND1, GND2 (A4-1, 32) W-R - W-B Parking brake switch input IG switch ON, parking brake switch ON Below 1.5 V
    PKB (A4-28) - GND1, GND2 (A4-1, 32) W-R - W-B Parking brake switch input IG switch ON, parking brake switch OFF 11 to 14 V
    +BS (A4-31) - GND1, GND2 (A4-1, 32) Y-W-B Power supply for solenoid from battery Always 11 to 14 V
    LBL (A4-41) - GND1, GND2 (A4-1, 32) V-R - W-B Brake fluid level warning switch input Brake fluid level min. -5 mm Below 1 Ω
    LBL (A4-41) - GND1, GND2 (A4-1, 32) V-R - W-B Brake fluid level warning switch input Brake fluid level max. 1.9 k to 2.1 kΩ
    CSW (A4-43) - GND1, GND2 (A4-1, 32) (*4) R-L - W-B AUTO LSD switch input Ignition switch ON, AUTO LSD switch ON Below 1.5 V
    CSW (A4-43) - GND1, GND2 (A4-1, 32) (*4) R-L - W-B AUTO LSD switch input Ignition switch ON, AUTO LSD switch OFF 8 to 14 V
    HDCS (A4-44) - GND1, GND2 (A4-1, 32) (*5) P-G - W-B A-TRAC switch input Ignition switch ON, A-TRAC switch ON Below 1.5 V
    HDCS (A4-44) - GND1, GND2 (A4-1, 32) (*5) P-G - W-B A-TRAC switch input Ignition switch ON, A-TRAC switch OFF 8 to 14 V
    STP2 (A4-45) - GND1, GND2 (A4-1, 32) G-Y - W-B Stop light switch input Stop light switch OFF (Brake pedal released) Below 1.5 V
    STP2 (A4-45) - GND1, GND2 (A4-1.32) G-Y - W-B Stop light switch input Stop light switch ON (Brake pedal released) 8 to 14 V
    IG2 (A5-1) - GND3 (A5-4) B-O - W-B IG2 power supply IG switch OFF Below 1 V
    IG2 (A5-1) - GND3 (A5-4) B-O - W-B IG2 power supply IG switch ON 11 to 14 V
    +BM2 (A5-2) - GND3 (A5-4) L-Y - W-B Power supply for motor from battery Always 11 to 14 V
    HINT:
    • (*1): A/T
    • (*2):4WD
    • (*3): with rear differential lock
    • (*4): with AUTO LSD
    • (*5): with A-TRAC
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