Toyota Tacoma manuals

Toyota Tacoma 2015-2018 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 resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F13-12 (SLS) - F12-10 (GND)

L - W-B

Differential lock indicator switch

Ignition switch ON

Rear differential FREE

10 to 14 V

Ignition switch ON

Rear differential LOCK

Below 1.5 V

F13-15 (R) - F12-10 (GND)

R - W-B

Differential lock switch input

Ignition switch ON

Differential lock switch not pressed

11 to 14 V

Ignition switch ON

Differential lock switch pressed and held

Below 1.5 V

F13-20 (CANH) - F13-40 (CANL)

BE - W

HIGH-level CAN bus wire

- LOW-level CAN bus wire

Ignition switch off

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

F13-21 (+B) - F12-10 (GND)

W - W-B

ECU power supply

Always

10 to 14 V

F12-1 (SL+) - F12-10 (GND)

B - W-B

Differential lock coil drive output (continuity with IG when operating)

Ignition switch ON

Rear differential free

Below 1.5 V

Ignition switch ON

Switching between free and locked (Condition: A or C)

Pulse generation (See waveform 1)

Ignition switch ON

Rear differential locked (Condition B)

Pulse generation (See waveform 1)

F12-4 (IG) - F12-10 (GND)

Y - W-B

ECU and actuator power supply

Ignition switch ON

11 to 14 V

F12-5 (SL-) - F12-10 (GND)

W - W-B

Differential lock coil drive output (continuity with GND when operating)

Ignition switch ON

Rear differential free

Below 1.5 V

Ignition switch ON

Rear differential switching between free and locked (Condition: A or C)

Pulse generation (See waveform 2)

Ignition switch ON

Rear differential locked (Condition B)

Pulse generation (See waveform 2)

F12-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(b) Waveform 1

(1) Rear differential in locked condition

Item

Content

Tester Connection

F12-1 (SL+) - F12-10 (GND)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition: A

Ignition switch ON

Switching between free and locked

Condition: B

Ignition switch ON

Rear differential locked

Text in Illustration

*a

Condition: A

*b

Condition: B

(2) Rear differential not in locked condition (switching between free and locked)

Item

Content

Tester Connection

F12-1 (SL+) - F12-10 (GND)

Tool Setting

.5 V/DIV., 500 ms./DIV.

Condition: C

Ignition switch ON

Switching between free and locked

(c) Waveform 2

(1) Rear differential in locked condition

Item

Content

Tester Connection

F12-5 (SL-) - F12-10 (GND)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition: A

Ignition switch ON

Switching between free and locked

Condition: B

Ignition switch ON

Rear differential locked

Text in Illustration

*a

Condition: A

*b

Condition: B

(2) Rear differential not in locked condition (switching between free and locked)

Item

Content

Tester Connection

F12-5 (SL-) - F12-10 (GND)

Tool Setting

5 V/DIV., 500 ms./DIV.

Condition: C

Ignition switch ON

Switching between free and locked

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