Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK GROUND CONNECTION 
   1. Turn A/C switch and blower fan switch OFF.
   2. Stop engine.
   3. Turn ignition switch OFF.
   4. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT 
   1. Disconnect refrigerant pressure sensor harness connector.
   2. Turn ignition switch ON.
   3. Check the voltage between refrigerant pressure sensor harness connector and ground.

      Refrigerant pressure sensor		Ground	Voltage (V)
      Connector	Terminal
      E219	1	Ground	Approx. 5

      Fig 1: Checking Voltage Between Refrigerant Pressure Sensor Connector And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

3. DETECT MALFUNCTIONING PART 

   Check the following.

   • Harness connectors E3, F1
   • Junction block connectors E44, E45
   • IPDM E/R harness connectors E18, E201
   • Harness for open or short between ECM and refrigerant pressure sensor

     : Repair open circuit, short to ground or short to power in harness or connectors.

4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

      Refrigerant pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E219	3	F13	40	Existed

   4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

5. DETECT MALFUNCTIONING PART 

   Check the following.

   • Harness connectors E3, F1
   • IPDM E/R harness connectors E18, E201
   • Harness for open or short between ECM and refrigerant pressure sensor

     : Repair open circuit, short to ground or short to power in harness or connectors.

6. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
   1. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.

      Refrigerant pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E219	2	F13	39	Existed

   2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7.

7. DETECT MALFUNCTIONING PART 

   Check the following.

   • Harness connectors E3, F1
   • IPDM E/R harness connectors E18, E201
   • Harness for open or short between ECM and refrigerant pressure sensor

     : Repair open circuit, short to ground or short to power in harness or connectors.

8. CHECK INTERMITTENT INCIDENT 

   Refer to "INTERMITTENT INCIDENT ".

   Is the inspection result normal? 

   YES: Replace refrigerant pressure sensor. Refer to "REMOVAL AND INSTALLATION " (with color display) or "REMOVAL AND INSTALLATION " (with monochrome display).

   NO: Repair or replace malfunctioning part.