8509031

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 ON SIGNAL SWITCH" is "OFF" : "A/C PRESSURE SENSOR" is 1200mV~1800mV

"A/C ON SIGNAL SWITCH" is "ON" : Higher than A/C "OFF" pressure by more than 500mV

Fig.1) Data at idle and A/C "OFF".

Fig.2) Data at idle and A/C "ON". A/C pressure transducer output voltage increases as A/C compressor operates.

☞ A/C pressure transducer voltage varies too much, therefore do not concern too much about the figure instead, check the rising tendency of A/C pressure transducer.