Diagnosis System

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) Air conditioning system data and 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





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(a) Turn the engine switch off.

(b) Turn the engine switch on (ACC) and wait at least 5 seconds.

(c) Press and hold the air conditioning control "AUTO" switch and "recirculation/fresh" switch simultaneously, and turn the engine switch on (IG). Continue holding the 2 switches until panel diagnosis mode begins.

(d) Check that all indicators turn on and off 4 times in succession at 1 second intervals.





HINT
* After the indicator check is completed, the system enters DTC check mode automatically.
* Press the "OFF" switch to cancel the check mode.

5. DTC CHECK (SENSOR CHECK)





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(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 code displayed on the panel.

NOTICE:
In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be only partially completed.

HINT
Refer to the 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 DTC 23 is output.

(d) If the codes are difficult to read because they change automatically, operate the driver temperature up switch to display the codes one at a time so that they can be read easily. The items are displayed one by one each time the driver temperature up switch is operated.

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