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:
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) Blind spot monitor data and Diagnostic Trouble Codes (DTCs) can be read from
the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning,
use the Techstream to check for malfunctions and to repair it.
2. CHECK DLC3
(a) Check ...
Short to GND in Outer Mirror Indicator(Slave) (C1AB3)
DESCRIPTION
This DTC is stored when the blind spot monitor sensor RH detects a ground short
in the blind spot monitor indicator RH.
DTC Code
DTC Detection Condition
Trouble Area
C1AB3
With the blind spot monitor main switch assembly (w ...
Fail-safe Chart
FAIL-SAFE CHART
FAIL-SAFE FUNCTION
(a) When a malfunction occurs in the lane departure alert system, a message will
be displayed on the multi-information display in the combination meter assembly
and the lane departure alert system will be disabled depending on the malfunction.
War ...
