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1.

Connect scan tool with 'DATA LINK CONNECTOR' (DLC).

2.

Warm engine up to normal operating temperature.

3.

Turn all the electrical devices including air conditioner OFF.

4.

Monitor "A/C ON SIGNAL SWITCH" and "A/C PRESSURE SENSOR" parameter on the scan tool.

Reference value :

A/C switch "ON" : A/C RELAY "ON" (A/C compressor turns ON and OFF periodically by A/C pressure S/W. )

A/C switch "OFF" : A/C RELAY "OFF"

Fig.1) The operating condition of A/C relay is shown.

☞ Check if A/C compressor works properly when A/C switch is turning ON.

☞ Diagnosing problem of "A/C RELAY" and "A/C COMPRESSOR" is convenient through ACTUATION TEST on the scan tool.