Diagnosis System

HEATING / AIR CONDITIONING: AIR CONDITIONING 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 General Information.

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 engine switch off.

(b) Turn the engine switch on (IG) while pressing the A/C control "AUTO" switch and "R/F" 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 at 1 second intervals 4 times in succession.





HINT
* The sensor check automatically starts when the indicator check is completed.
* Press the "OFF" switch to cancel the check mode.
* If a navigation system is installed, the indicator will blink and the buzzer will sound.

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 DTC displayed on the panel.





NOTICE:
* In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the actuator check, and then the sensor check again.
* If the check is performed in a dark place, DTC 21 or 24 may be displayed even though the system is normal.

HINT
Refer to the DTC chart (Diagnostic Trouble Code chart) for details of the codes Air Conditioning System.

* When there are no problems, DTC 00 is output.
* As an example, the illustration shows that display code 21 is output.

(d) If the steps are difficult to read because they change automatically, push the "UpDr" 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 "UpDr" switch is pushed.





* Push the "OFF" switch to finish panel diagnosis.

* Push the "R/F" switch to enter actuator check mode.

(e) Clear the DTC





(1) During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch at the same time.

6. ACTUATOR CHECK

(a) Start the engine and warm it up.

(b) Perform the indicator check.

(c) Push the "R/F" switch to perform the actuator check.





HINT
Be sure to perform the actuator check after starting the engine.

(d) As the actuator check is repeated from steps 1 to 10 at 1 second intervals, check the temperature and air flow visually and by hand.





HINT
* The display blinks at 1 second intervals in the step operation.
* Push the "OFF" switch to finish panel diagnosis.
* Push the "AUTO" switch to enter sensor check mode.





HINT
*: This only occurs for check mode.

The air outlets remain the same but the air mix damper position will differ.

(e) If the steps are difficult to read because they change automatically, push the "UpDr" 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 "UpDr" switch is pushed.





HINT
* Push the "OFF" switch to finish panel diagnosis.
* Push the "R/F" switch to enter sensor check mode.