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

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Diagnosis System

DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) Air conditioning system data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (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) Check the DLC3 (See page 3. LIST OF OPERATION METHODS ).

3. LIST OF OPERATION METHODS

(a) By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.

4. INDICATOR CHECK

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON while pressing the air conditioning panel "AUTO" switch and "Recirculation/Fresh" switch simultaneously. Hold both switches until the indicator check screen appears.

Text in Illustration

Example

(c) The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off 4 times at 1 second intervals continuously.

Text in Illustration

*a	Example	*b	State of indicator check
*c	On	*d	Off
*e	1 second	-	-

HINT:

The sensor check automatically starts when the indicator check is completed.
Press the "OFF" switch to cancel check mode.

5. SENSOR CHECK (DTC CHECK)

(a) Start the engine and warm it up.

(b) Perform the indicator check.

HINT:

After the indicator check is completed, the system enters DTC check mode automatically.

Text in Illustration

*a	Example
*b	DTC

NOTICE:

In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the sensor check again.

HINT:

Refer to Diagnostic Trouble Code Chart for details of the codes (See page ).

When there are no problems, DTC 00 is output.
As an example, the illustration shows that DTC 12 is output.

(d) If the steps are difficult to read because they change automatically, press the "driver side TEMP UP" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "driver side TEMP UP" switch is pressed.

HINT:

Press the "OFF" switch to finish panel diagnosis.

6. SENSOR CHECK (CLEAR DTC)

(a) During the sensor check, press the "Mirror Heater" switch and "Rear DEF" switch simultaneously.

Text in Illustration

Example

System Description

SYSTEM DESCRIPTION 1. GENERAL (a) The air conditioning system has the following controls. Control Outline Neural Network Control This control is ca ...

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Other materials:

Front Stabilizer Bar
Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT FRONT STABILIZER LINK ASSEMBLY (a) Flip the ball joint stud back and forth 5 times, as shown in the illustration, before installing the nut. (b) Using a torque wrench, turn the nut continuously at a rate ...

Diagnosis System
DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here FUNCTION OF WARNING INDICATOR AND MESSAGE (a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message displayed on the multi-information display. Mas ...

Open in Bus 2 Main Bus Line
DESCRIPTION There may be an open circuit in one of the CAN main bus lines and/or a central gateway ECU (network gateway ECU) branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. Detection It ...