Toyota Tacoma 2015-2018 Service Manual: 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

(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.

(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.

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.

(c) Read the DTCs displayed on the display.

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 ).

(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.