Toyota Tacoma (2015-2018) Service Manual: Diagnosis System

Toyota Tacoma (2015-2018) Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / 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 3. FUNCTION OF INDICATOR LIGHT ).

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	Not illuminated	When 2WD or H4: Not illuminated When L4: Illuminated	2WD-4WD mode change malfunction visit your dealer
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) ...

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