Simple Inspection Of The A/C Pressure Sensor

WARNING: This page is about a different car, the 2015 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 (See Fig 2).
Turn ON the engine and then turn ON the air conditioning switch.

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

Fig 2: Checking Voltage Between A/C Pressure Sensor Terminal 2 And 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 in the figure below.
NOTE: The allowance shall be defined as ±5%.

Fig 3: VS Refrigerant Pressure Out Voltage Graph
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.