2. Check Refrigerant Pressure Sensor Power Supply Circuit

1. Turn A/C switch and blower switch OFF.
2. Stop engine.
3. Disconnect refrigerant pressure sensor harness connector.
4. Turn ignition switch ON.
5. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.
   1. Voltage: Approximately 5V 

OK or NG 

OK >> GO TO 4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .

NG >> GO TO 3. DETECT MALFUNCTIONING PART .

Fig 1: Check Voltage Between Refrigerant Pressure Sensor Terminal 1 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.