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 |
|
*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 |
|
*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:
Front Radar Sensor Beam Axis Not Adjusted (C1A14)
DESCRIPTION
After installing a new millimeter wave radar sensor assembly, if sensor beam
axis adjustment has not been performed, DTC C1A14 will be stored.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1A14
Fro ...
Brake Warning Light Remains ON
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination
meter assembly via CAN communication.
If any of the following is detected, the brake warning light remains on:
The skid control ECU (brake actuator assembly) connector is disconnected
from the ...
Sliding Roof does not Move by Operating Sliding Roof Control Switch
DESCRIPTION
The sliding roof ECU (sliding roof drive gear sub-assembly) receives slide and
tilt signals when the sliding roof switch is operated and drives its built-in motor.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before ...
