Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK 4 WHEEL DRIVE CONTROL ECU

Text in Illustration

*a

Component with harness connected

(4 Wheel Drive Control ECU)

-

-

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A25-1 (DM1) - A25-5 (GND)

W - W-B

A. D. D. shift motor output

Ignition switch ON

Transfer position switch 4H → 2WD

(during A.D.D. actuator Lock to Free operation)

10 to 14 V

A25-2 (DM2) - A25-5 (GND)

Y - W-B

A. D. D. shift motor output

Ignition switch ON

Transfer position switch 2WD → 4H

(during A.D.D. actuator Free to Lock operation)

10 to 14 V

A25-5 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A25-6 (B) - A25-5 (GND)

G - W-B

ECU power supply

Always

11 to 14 V

A25-7 (DL1) - A25-5 (GND)

LG - W-B

A.D.D. actuator limit switch input

Ignition switch ON

Transfer position 2WD (A.D.D. actuator Free)

10.5 to 14 V

Ignition switch ON

Transfer position 4WD (A.D.D. actuator Lock)

Below 1.5 V

A25-11 (LO) - A25-5 (GND)

P - W-B

Transfer position switch input

Ignition switch ON

Transfer position switch 2WD

10.5 to 14 V

Ignition switch ON

Transfer position switch 4H

Below 1.5 V

Ignition switch ON

Transfer position switch 4L

Below 1 V

A25-12 (2-4) - A25-5 (GND)

B - W-B

Transfer position switch input

Ignition switch ON

Transfer position switch 2WD

Below 1 V

Ignition switch ON

Transfer position switch 4H

Below 1.5 V

Ignition switch ON

Transfer position switch 4L

10.5 to 14 V

A25-16 (IG) - A25-5 (GND)

V - W-B

IG power

Ignition switch ON

11 to 14 V

A25-18 (ADD) - A25-5 (GND)

GR - W-B

A.D.D. detection switch input

Ignition switch ON

Transfer position 2WD

10 to 14 V

Ignition switch ON

Transfer position 4WD

Below 1.5 V

A25-20 (DL2) - A25-5 (GND)

R - W-B

A.D.D. actuator limit switch input

Ignition switch ON

Transfer position 2WD (A.D.D. actuator Free)

Below 1.5 V

Ignition switch ON

Transfer position 4WD (A.D.D. actuator Lock)

10.5 to 14 V

A25-23 (CANH) - A25-22 (CANL)

BE - W

CAN communication line

Ignition switch off

54 to 69 Ω

A26-1 (TM1) - A25-5 (GND)

R - W-B

Transfer shift motor output

Ignition switch ON

Shift lever in N

Transfer position switch turned from 2WD to 4H (switching from 2WD to 4H)

Transfer position switch turned from 4H to 4L (switching from 4H to 4L)

10 to 14 V

A26-2 (TM2) - A25-5 (GND)

W - W-B

Transfer shift motor output

Ignition switch ON

Shift lever in N

Transfer position switch turned from 4L to 4H (switching from 4L to 4H)

Transfer position switch turned from 4H to 2WD (switching from 4H to 2WD)

10 to 14 V

A26-6 (SCC) - A25-5 (GND)

L - W-B

Solenoid coil output

Ignition switch ON

Transfer position switch turned from 2WD to 4H (switching from 2WD to 4H))

10 to 14 V

A26-12 (H4) - A25-5 (GND)

BE - W-B

Transfer indicator switch input

Ignition switch ON

Transfer position not in 4L

4 to 6 V

Ignition switch ON

Transfer position 4L

Below 1.5 V

A26-13 (L4) - A25-5 (GND)

B - W-B

Transfer indicator switch input

Ignition switch ON

Transfer position not in 4L

11 to 14 V

Ignition switch ON

Transfer position 4L

Below 1.5 V

A26-18 (TL1) - A25-5 (GND)

V - W-B

Transfer shift actuator limit switch input

Ignition switch ON

Not switching driving mode

4 to 6 V

Ignition switch ON

Switching driving mode

4 to 6 V ←→ Below 1.5 V

A26-20 (TL2) - A25-5 (GND)

BR - W-B

Transfer shift actuator limit switch input

Ignition switch ON

Not switching driving mode

4 to 6 V

Ignition switch ON

Switching driving mode

4 to 6 V ←→ Below 1.5 V

A26-22 (GTL) - A25-5 (GND)

P - W-B

Transfer shift actuator limit switch GND input

Ignition switch ON

Not switching driving mode

4 to 6 V

Ignition switch ON

Switching driving mode

Below 1.5 V

A26-24 (TL4) - A25-5 (GND)

SB - W-B

Transfer shift actuator limit switch input

Ignition switch ON

Not switching driving mode

4 to 6 V

Ignition switch ON

Switching driving mode

4 to 6 V ←→ Below 1.5 V

A26-26 (TL3) - A25-5 (GND)

W - W-B

Transfer shift actuator limit switch input

Ignition switch ON

Not switching driving mode

4 to 6 V

Ignition switch ON

Switching driving mode

4 to 6 V ←→ Below 1.5 V

    System Diagram

    Lost Communication with ECM / PCM "A" (U0100,U0122)

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