Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. TERMINALS OF ECU

Text in Illustration

*a

Component without harness connected

(Skid Control ECU)

-

-

Terminal No. (Symbol)

Terminal Description

A6-1 (GND1)

Skid control ECU ground

A6-2 (+BM1)

Power supply for motor

A6-3 (FR+)

Front speed sensor RH power supply output

A6-4 (FL-)

Front speed sensor LH input

A6-5 (RR+)

Rear speed sensor RH power supply output

A6-6 (RL-)

Rear speed sensor LH input

A6-7 (STP)

Stop light switch assembly

A6-9 (CSW)

VSC OFF switch

A6-11 (CANH)

CAN communication terminal H

A6-12 (SP1)

Speedometer signal

A6-13 (ATRC)*2

A-TRAC switch

A6-16 (STPO)

Stop light switch assembly

A6-17 (FR-)

Front speed sensor RH input

A6-18 (FL+)

Front speed sensor LH power supply output

A6-19 (RR-)

Rear speed sensor RH input

A6-20 (RL+)

Rear speed sensor LH power supply output

A6-24 (TS)

Sensor test terminal (Signal check switch)

A6-25 (CANL)

CAN communication terminal L

A6-27 (EXI)*2

for Part-time 4WD: A.D.D. detection switch

for Full-time 4WD: Center differential lock detection switch

A6-31 (+BS)

Power supply for solenoid

A6-32 (GND2)

Skid control ECU ground

A6-40 (EXI3)

w/ Rear Differential Lock: Rear differential lock detection switch

w/o Rear Differential Lock*1: IG power supply

w/o Rear Differential Lock*2: Front wheel drive ECU

A6-41 (LBL)

Brake fluid level warning switch

A6-44 (HDCS)*3

Downhill assist control switch

A6-45 (STP2)

Stop light switch assembly

A6-46 (IG1)

IG1 power supply

A7-1 (IG2)

IG2 power supply

A7-2 (+BM2)

Power supply for motor

A7-4 (GND3)

Skid control ECU ground

  • *1: for 2WD
  • *2: for 4WD
  • *3: w/ Downhill Assist Control

2. TERMINAL INSPECTION

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

HINT:

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

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU)

-

-

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A6-1 (GND1) - Body ground

W-B

Ground

Always

Below 1 Ω

A6-2 (+BM1) - Body ground

B

Power supply for motor

(from battery)

Always

11 to 14 V

A6-7 (STP) - Body ground

L

Stop light switch assembly

Brake pedal depressed → released

8 to 14 V → Below 1.5 V

A6-9 (CSW) - Body ground

V-W

VSC OFF switch input

VSC OFF switch off → on and held

10 kΩ or higher → Below 1 Ω

A6-13 (ATRC) - Body ground*1

LG

A-TRAC switch input

A-TRAC switch off → on and held

10 kΩ or higher → Below 1 Ω

A6-16 (STPO) - Body ground

LG-B

Stop light switch assembly

Always

11 to 14 V

A6-31 (+BS) - Body ground

L-R

Power supply for solenoid

(from battery)

Always

11 to 14 V

A6-32 (GND2) - Body ground

W-B

Ground

Always

Below 1 Ω

A6-41 (LBL) - Body ground

V-G

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

A6-44 (HDCS) - Body ground*2

P

Downhill assist control switch input

Downhill assist control switch off → on

10 kΩ or higher → Below 1 Ω

A6-45 (STP2) - Body ground

V-G

Stop light switch assembly

Brake pedal depressed → released

8 to 14 V → Below 1.5 V

A6-46 (IG1) - Body ground

G

IG1 power supply

Ignition switch off → ON

Below 1 V → 11 to 14 V

A7-1 (IG2) - Body ground

W

IG2 power supply

Ignition switch off → ON

Below 1 V → 11 to 14 V

A7-2 (+BM2) - Body ground

B

Power supply for motor

(from battery)

Always

11 to 14 V

A7-4 (GND3) - Body ground

W-B

Ground

Always

Below 1 Ω

  • *1: for 4WD
  • *2: w/ Downhill Assist Control
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