Not Using SUZUKI Scan Tool

Connect manifold gauge set to charging valves.
Special Tool

: 09990-06020
Disconnect A/C refrigerant pressure sensor connector (1).
Connect terminals of A/C refrigerant pressure sensor (2) and A/C refrigerant pressure sensor connector with service wire (5).
Connect voltmeter (4) between terminal "2" (3) of sensor connector and vehicle body.

Fig 1: Connecting Voltmeter Between Terminals Of Sensor Connector And Vehicle Body
Courtesy of SUZUKI OF AMERICA CORP.
Push engine switch to change ignition mode to "ON".
When A/C switch is at OFF, check pressure [B] of high pressure gauge and voltage [A] of A/C refrigerant pressure sensor.
Start engine and operate A/C system.
Check that the voltage increases as the refrigerant pressure rises as shown in the illustration.
If check result is not satisfactory, replace A/C refrigerant pressure sensor.

Fig 2: A/C Refrigerant Pressure Sensor Characteristic Graph
Courtesy of SUZUKI OF AMERICA CORP.