Automotive air conditioning pressure switch three lines how to measure good or bad
In fact, the pressure switch is normal when there are two lines are the way, the two lines in series in the control loop to protect the high and low voltage anomalies. The other as a signal line, feedback abnormal report, usually connected to the compressor fault indicator!
Marked as NO for the static end of the static normally open contact, and C line between the open state. Three lines of a two resistance reaction, the performance of the resistance tends to 0 value.
With a multimeter buzzer or 100 ohm stalls to measure the pressure switch is good or bad, that is, to measure its turn on and off the state, the power off, the switch marked as C (or com) for the public end of the line ,
