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:

Operation History List
OPERATION HISTORY LIST NOTICE: The cause of a malfunction is stored in the RAM or EEPROM in the certification ECU (smart key ECU assembly). As the cause of a malfunction stored in the RAM will be cleared when the cable is disconnected from the negative (-) battery terminal, do ...

Cruise Main Indicator Light Circuit
DESCRIPTION When the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button), the cruise control indicator (vehicle-to-vehicle distance control mode) illuminates. The ECM uses this and other indicators to indicate the control condition (presence o ...

Voice is not Recognized
PROCEDURE 1. CHECK CONDITION (a) Check if the system voice recognition level is low for a particular voice. Result Result Proceed to System voice recognition level is low for any voice. A System vo ...

© 2011-2021 Copyright www.ttguide.net