Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. TERMINALS OF ECU

Text in Illustration

*a

Component without harness connected

(Skid Control ECU (Master Cylinder Solenoid))

-

-

Terminal No. (Symbol)

Terminal Description

S1-1 (GND1)

Ground

S1-2 (+BM1)

Power supply for motor

S1-3 (FR+)

Front wheel speed sensor RH power supply output

S1-4 (FL-)

Front wheel speed LH signal input

S1-5 (RR+)

Rear wheel speed sensor RH power supply output

S1-6 (RL-)

Rear wheel speed LH signal input

S1-7 (STP)

Stop light switch input

S1-9 (CSW)

VSC OFF switch input

S1-11 (CANH)

CAN communication line H

S1-12 (SP1)

Speed signal output for speedometer

S1-13 (TRM3)

A-TRAC switch input*1

CRAWL speed selector switch*2

S1-16 (STPO)

Stop light operated relay output

S1-17 (FR-)

Front wheel speed sensor RH input

S1-18 (FL+)

Front wheel speed sensor LH power supply output

S1-19 (RR-)

Rear wheel speed sensor RH input

S1-20 (RL+)

Rear wheel speed sensor LH power supply output

S1-21 (TRM2)

CRAWL speed selector switch*2

S1-25 (CANL)

CAN communication line L

S1-27 (EXI)

L4 detection switch input

S1-28 (PKB)

MTS SET switch input

S1-29 (EXI4)

4WD detection switch input

S1-31 (+BS)

Power supply for solenoid

S1-32 (GND2)

Ground

S1-41 (LBL)

Brake fluid level warning switch input

S1-43 (TRS)

CRAWL ON/OFF switch*2

S1-44 (TRM1)

CRAWL speed selector switch*2

S1-45 (STP2)

Stop light switch input

S1-46 (IG1)

IG1 power supply

S2-1 (IG2)

IG2 power supply

S2-2 (+BM2)

Power supply for motor

S2-4 (GND3)

Ground

  • *1: for Manual Transmission
  • *2: for Automatic Transmission

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 (master cylinder solenoid) as the connector is water resistant.

Text in Illustration

*a

Front view of wire harness connector

(Skid Control ECU (Master Cylinder Solenoid))

-

-

Standard

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

S1-1 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

S1-2 (+BM1) - Body ground

B - Body ground

Power supply for motor from battery

Always

11 to 14 V

S1-7 (STP) - Body ground

SB - Body ground

Stop light switch input

Stop light switch off (Brake pedal released)

Below 1.5 V

Stop light switch on (Brake pedal depressed)

8 to 14 V

S1-9 (CSW) - Body ground

GR - Body ground

VSC OFF switch input

VSC OFF switch off

10 kΩ or higher

VSC OFF switch on and hold

Below 1 Ω

S1-16 (STPO) - Body ground

B - Body ground

Stop light operated relay output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

S1-31 (+BS) - Body ground

R - Body ground

Power supply for solenoid from battery

Always

11 to 14 V

S1-32 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

S1-41 (LBL) - Body ground

V - Body ground

Brake fluid level warning switch input

Brake fluid level min. -5 mm

Below 1 Ω

Brake fluid level max.

1.9 to 2.1 kΩ

S1-45 (STP2) - Body ground

L - Body ground

Stop light switch input

Stop light switch off (Brake pedal released)

Below 1.5 V

Stop light switch on (Brake pedal depressed)

8 to 14 V

S1-46 (IG1) - Body ground

G - Body ground

IG1 power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

S2-1 (IG2) - Body ground

BE - Body ground

IG2 power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

S2-2 (+BM2) - Body ground

B - Body ground

Power supply for motor from battery

Always

11 to 14 V

S2-4 (GND3) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

Test Mode Procedure
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Diagnosis System
DIAGNOSIS SYSTEM 1. DIAGNOSIS (a) If the skid control ECU (master cylinder solenoid) detects a malfunction, the ABS and/or BRAKE warning lights and the slip indicator lights come on in accordance ...

Other materials:

Inspection
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Removal
REMOVAL PROCEDURE 1. REMOVE FRONT DOOR SCUFF PLATE LH (for Double Cab) 2. REMOVE FRONT DOOR SCUFF PLATE LH (for Access Cab) 3. REMOVE COWL SIDE TRIM BOARD LH 4. REMOVE CENTER INSTRUMENT CLUSTER CENTER FINISH PANEL SUB-ASSEMBLY 5. REMOVE INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY ...

Open / Short in Steering Lock ECU (B2781)
DESCRIPTION The steering lock ECU and steering lock motor are built into the steering lock actuator assembly. The steering lock ECU (steering lock actuator or UPR bracket assembly) detects whether the steering lock is in the lock or unlock position by using the lock sensor and unlock sensor ...

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