Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

TERMINALS OF ECU

*a

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

-

-

Terminal No. (Symbol)

Terminal Description

   

1 (+BM)

ABS motor relay power supply

2 (STP)

Stop light switch assembly input

3

-

4 (SP1)

Speed signal output for speedometer

5

-

6 (IG1)

IG1 power source input

7

-

8

-

9

-

10 (CANL)

CAN communication line L

11 (CANH)

CAN communication line H

12 (STP2)

Stop light control relay (VSC ACC) input

13 (GND2)

Pump motor ground

14

-

15

-

16

-

17 (FSW+)

Brake pedal load sensing switch input

18

-

19

-

20 (CSW)

VSC OFF switch (traction control switch) input

21

-

22 (EXI2)

A.D.D. detection switch (A.D.D. actuator) input

23

-

24

-

25 (+BS)

ABS solenoid relay power supply

26 (FR-)

Front wheel speed RH (-) signal input

27 (FR+)

Front wheel speed RH (+) signal input

28 (STPO)

Stop light control relay (VSC ACC) output

29 (RL+)

Rear wheel speed LH (+) signal input

30 (RL-)

Rear wheel speed LH (-) signal input

31 (D/G)

Diagnostic tester communication line

32

-

33 (RR-)

Rear wheel speed RH (-) signal input

34 (RR+)

Rear wheel speed RH (+) signal input

35

-

36 (FL+)

Front wheel speed LH (+) signal input

37 (FL-)

Front wheel speed LH (-) signal input

38 (GND1)

Skid control ECU (brake actuator assembly) ground

TERMINAL INSPECTION

(a) Disconnect the connector and measure the voltage and resistance on the wire harness side.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

-

-

HINT:

The voltage cannot be measured with the connector connected to the skid control ECU (brake actuator assembly) because the connector is watertight.

Standard

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A57-1 (+BM) - Body ground

L - Body ground

ABS motor relay power supply

Always

11 to 14 V

A57-2 (STP) - Body ground

Y - Body ground

Stop light switch assembly input

Stop light switch assembly on → off (Brake pedal depressed → released)

8 to 14 V → Below 1.5 V

A57-6 (IG1) - Body ground

SB - Body ground

IG1 power source input

Ignition switch ON

11 to 14 V

A57-12 (STP2) - Body ground

GR - Body ground

Stop light control relay (VSC ACC) input

Stop light switch assembly on → off (Brake pedal depressed → released)

8 to 14 V → Below 1.5 V

A57-13 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

A57-17 (FSW+) - Body ground

GR - Body ground

Brake pedal load sensing switch input

Brake pedal load sensing switch OFF→ ON (Brake pedal depressed → released)

950 to 1050 Ω → 203 to 223 Ω

A57-20 (CSW) - Body ground

P - Body ground

VSC OFF switch (traction control switch) input

VSC OFF switch (traction control switch) on → off (Pressed → not pressed)

Below 1 Ω → 10 kΩ or higher

A57-22 (EXI2) - Body ground

GR - Body ground

A.D.D. detection switch (A.D.D. actuator) input

  • Ignition switch ON
  • 4WD (A.D.D. detection switch ON)

Below 1.5 V

  • Ignition switch ON
  • 2WD (A.D.D. detection switch OFF)

9.5 to 14 V

A57-25 (+BS) - Body ground

R - Body ground

ABS solenoid relay power supply

Always

11 to 14 V

A57-28 (STPO) - Body ground

BR - Body ground

Stop light control relay (VSC ACC) output

Always

11 to 14 V

A57-38 (GND1) - Body ground

W-B - Body ground

Skid control ECU (Brake actuator assembly) ground

Always

Below 1 Ω

    System Diagram

    Test Mode Procedure

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