Toyota Tacoma 2015-2018 Service Manual: 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 vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3
(a) Inspect the battery voltage.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge the battery before proceeding.
(b) Check the DLC3 (See page .gif)
).
3. FUNCTION OF INDICATOR LIGHT
(a) When a problem occurs in the touch select 2-4 and high-low system, a message is displayed on the multi-information display and/or the 4LO indicator light on the combination meter assembly rapidly blinks* to inform the driver of the problem.
- *: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
(b) Indicator light status (illumination and blinking) or multi-information display status when DTC is output.
TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM|
DTC No. |
4WD Indicator Light (Green) |
4LO Indicator Light |
Multi-information Display Message |
|---|---|---|---|
|
U0100 |
When 2WD: Not illuminated When H4 or L4: Illuminated |
Rapidly blinking |
- |
|
U0122 |
Not illuminated |
Rapidly blinking*1 |
2WD-4WD mode change malfunction visit your dealer |
|
U0416 |
|||
|
P163B |
|||
|
P17A0 |
|||
|
P17A4 |
Not illuminated |
Not illuminated |
2WD-4WD mode change malfunction visit your dealer |
|
P17A8 |
Not illuminated |
Rapidly blinking |
2WD-4WD mode change malfunction visit your dealer |
|
P17A9 |
|||
|
P17AA |
|||
|
P17AC |
|||
|
P17C7 |
Not illuminated |
When 2WD or H4: Not illuminated When L4: Illuminated |
2WD-4WD mode change malfunction visit your dealer |
|
P17C8 |
|||
|
P2772 |
When 2WD: Not illuminated When H4 or L4: Illuminated |
Rapidly blinking |
- |
|
P279E |
Not illuminated |
Rapidly blinking |
2WD-4WD mode change malfunction visit your dealer |
Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
- *1: P163B may also display the 2WD/4WD mode status.
System Diagram
SYSTEM DIAGRAM
Transmitting ECU (Transmitter)
Receiving ECU
Signal
Communication Method
4 wheel drive control ECU
Skid ...
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:
Power Outlet Socket(for Front Side)
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. REMOVE INSTRUMENT PANEL LOWER CENTER FINISH PANEL
(See page )
2. REMOVE NO. 1 POWER OUTLET SOCKET ASSEMBLY
(a) Using a screwdriver with its tip wrapped in protective tape, disengage
the 2 claws to remove t ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. REMOVE FRONT DOOR LOWER FRAME BRACKET GARNISH
(See page
)
2. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG
(See page
)
3. ...
Removal
REMOVAL
PROCEDURE
1. REMOVE FRONT FENDER MUDGUARD (w/ Mudguard)
Click here
2. REMOVE FRONT FENDER WHEEL OPENING MOULDING (w/ Over Fender)
Click here
3. REMOVE FRONT NO. 1 WHEEL OPENING EXTENSION PAD (w/ Front Spoiler)
(a) Remove 9 screws and front No. 1 wheel opening extension ...