Diagnosis Procedure

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

1. CHECK GROUND CONNECTION 
   1. Turn ignition switch OFF.
   2. 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 CONNECTOR 
   1. Disconnect EVAP control system pressure sensor harness connector.
   2. Check that water is not inside connectors.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness connector.

3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
   1. Turn ignition switch ON.
   2. Check the voltage between EVAP control system pressure sensor harness connector and ground.

      EVAP control system pressure sensor		Ground	Voltage (V)
      Connector	Terminal
      B41	3	Ground	Approx. 5

      Fig 1: Checking Voltage Between EVAP Control System Pressure Sensor Harness Connector And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 4.

4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II 
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

      EVAP control system pressure sensor		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      B41	3	E10	91	Existed

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

5. DETECT MALFUNCTIONING PART 

   Check the following.

   • Harness connectors B10, E29
   • Harness for open or short between EVAP control system pressure sensor and ECM

     : Repair open circuit.

6. CHECK SENSOR POWER SUPPLY CIRCUIT 

   Check harness for short to power and short to ground, between the following terminals.

   ECM		Sensor
   Connector	Terminal	Name	Connector	Terminal
   F13	72	Refrigerant pressure sensor	E219	1
   	76	CKP sensor (POS)	F30	1
   E10	87	APP sensor	E40	6
   	91	EVAP control system pressure sensor	B41	3

   Is the inspection result normal? 

   YES: GO TO 7.

   NO: Repair short to ground or short to power in harness or connectors.

7. CHECK COMPONENTS 

   Check the following.

   • Crankshaft position sensor (POS) (Refer to "COMPONENT INSPECTION ".)
   • Refrigerant pressure sensor (Refer to "DIAGNOSIS PROCEDURE ".)

     Is the inspection result normal? 

     YES: GO TO 8.

     NO: Replace malfunctioning components.

8. CHECK APP SENSOR 

   Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO  15.

   NO: GO TO 9.

9. REPLACE ACCELERATOR PEDAL ASSEMBLY 
   1. Replace accelerator pedal assembly. Refer to "REMOVAL AND INSTALLATION ".
   2. Refer to "SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

       EVAP control system pressure sensor		ECM		Continuity
       Connector	Terminal	Connector	Terminal
       B41	1	E10	96	Existed

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

       Is the inspection result normal? 

       YES: GO TO  12.

       NO: GO TO 11.

11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B10, E29
    • Harness for open or short between EVAP control system pressure sensor and ECM

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

12. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

       EVAP control system pressure sensor		ECM		Continuity
       Connector	Terminal	Connector	Terminal
       B41	2	E10	86	Existed

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

       Is the inspection result normal? 

       YES: GO TO  14.

       NO: GO TO 13.

13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B10, E29
    • Harness for open or short between EVAP control system pressure sensor and ECM

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

14. CHECK RUBBER TUBE 
    1. Disconnect rubber tube connected to EVAP canister vent control valve.
    2. Check the rubber tube for clogging.

       Is the inspection result normal? 

       YES: GO TO 15.

       NO: Clean the rubber tube using an air blower, repair or replace rubber tube.

15. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 16.

    NO: Replace EVAP canister vent control valve. Refer to "REMOVAL AND INSTALLATION ".

16. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 17.

    NO: Replace EVAP control system pressure sensor. Refer to "REMOVAL AND INSTALLATION ".

17. CHECK DRAIN FILTER 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 18.

    NO: Replace drain filter.

18. CHECK IF EVAP CANISTER IS SATURATED WITH WATER 
    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to "REMOVAL AND INSTALLATION (EVAP CANISTER) ".
    2. Check if water will drain from the EVAP canister.
       Fig 2: Checking EVAP Canister For Water

       Courtesy of NISSAN NORTH AMERICA, INC.

       Does water drain from the EVAP canister? 

       YES: GO TO 19.

       NO: GO TO  21.

19. CHECK EVAP CANISTER 

    Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

    The weight should be less than 2.1 kg (4.6 lb). 

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: GO TO 20.

20. DETECT MALFUNCTIONING PART 

    Check the following.

    • EVAP canister for damage
    • EVAP hose between EVAP canister and drain filter for clogging or poor connection

      : Repair hose or replace EVAP canister. Refer to "REMOVAL AND INSTALLATION (EVAP CANISTER) ".

21. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END