Simple Inspection Of The A/C Pressure Sensor

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Assemble a gauge manifold on the high pressure service valve.
Disconnect the A/C pressure sensor connector and connect special tool test harness MB991658 as shown in the illustration.
Turn ON the engine and then turn ON the air conditioner switch.

Fig 1: A/C Pressure Sensor
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Measuring Voltage Between A/C Pressure Sensor Connector Terminal & Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
At this time, check to see that the voltage of A/C pressure sensor terminal No. 2 reflects the specifications of the illustration.
NOTE: The allowance shall be defined as ± 5%.

Fig 3: Refrigerant Pressure & Output Voltage Graph
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.