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

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION The 4 wheel drive control ECU records DTCs when the ECU detects a malfunction in the ECU itself or in system circuits. The DTCs can be read through the DLC3 of the ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Check the DTCs. (1) Turn the ignition switch off. (2) Connect the Techstream to the DLC3. (3) Turn the ignition switch to ON. (4) Turn the Techstream on. (5) ...

Other materials:

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) When troubleshooting OBD II (On-Board Diagnostics) vehicles, an OBD II scan tool (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle ECM (Engine Control Module) can be then read. (b) ...

Precaution
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Vehicle Information Not Obtained (C1A02)
DESCRIPTION When a new millimeter wave radar sensor assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or 4WD, etc.) from the main body ECU (multiplex network body ECU) and stores the information. DTC C1A02 is stored when the millime ...

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