Diagnosis Procedure

1. CHECK GROUND CONNECTIONS
   1. Turn ignition switch OFF.
   2. Loosen and retighten ground screws on the body.

   Refer to "GROUND INSPECTION ".

   • <=: Vehicle front
   • Body ground (1)

   OK or NG 

   OK: GO TO 2.

   NG: Repair or replace ground connections.

   Fig 1: Location Of Ground Screws

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK TUMBLE CONTROL VALVE POSITION SENSOR POWER SUPPLY CIRCUIT-I
   1. Reconnect ECM harness connector disconnected.
   2. Turn ignition switch ON.
   3. Check voltage between tumble control valve actuator terminal 1 and ground with CONSULT-III or tester.

      Voltage : Battery voltage 

   OK or NG 

   YES: GO TO  10.

   NO: GO TO 3.

   Fig 2: Checking Voltage Between Tumble Control Valve Actuator Terminal 1 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. CHECK TUMBLE CONTROL VALVE POSITION SENSOR POWER SUPPLY CIRCUIT-II
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Check harness continuity between tumble control valve actuator terminal 1 and ECM terminal 69.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

   OK or NG 

   OK: GO TO 4.

   NG: Repair open circuit.

4. CHECK POWER SUPPLY CIRCUITS

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

   TERMINALS REFERENCE CHART
   
   

   ECM terminal	Sensor terminal	Reference Wiring Diagram
   69	Tumble control valve actuator terminal 1	"WIRING DIAGRAM "
   74	Refrigerant pressure sensor terminal 3	"WIRING DIAGRAM "
   75	Crankshaft position sensor (POS) terminal 1	"WIRING DIAGRAM "
   76	EVAP control system pressure sensor terminal 3	"WIRING DIAGRAM "
   102	APP sensor terminal 5	"WIRING DIAGRAM "

   OK or NG 

   OK: GO TO 5.

   NG: Repair short to ground or short to power in harness or connectors.

5. CHECK CRANKSHAFT POSITION SENSOR (POS)

   Refer to "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO 6.

   NG: Replace crankshaft position sensor (POS). Refer to CYLINDER BLOCK .

6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

   Refer to "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO 7.

   NG: Replace EVAP control system pressure sensor. Refer to EVAPORATIVE EMISSION SYSTEM .

7. CHECK REFRIGERANT PRESSURE SENSOR

   Refer to TROUBLE DIAGNOSIS .

   OK or NG 

   OK: GO TO 8.

   NG: Replace refrigerant pressure sensor. Refer to REMOVAL AND INSTALLATION FOR REFRIGERANT PRESSURE SENSOR .

8. CHECK APP SENSOR

   Refer to "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO  12.

   NG: GO TO 9.

9. REPLACE ACCELERATOR PEDAL ASSEMBLY

   Replace accelerator pedal assembly. Refer to "REMOVAL AND INSTALLATION ".

   INSPECTION END 

10. CHECK TUMBLE CONTROL VALVE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between tumble control valve actuator terminal 2 and ECM terminal 47.

       Refer to WIRING DIAGRAM .

       Continuity should exist  .

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

    OK or NG 

    OK: GO TO 11.

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

11. CHECK TUMBLE CONTROL VALVE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between tumble control valve actuator terminal 3 and ECM terminal 35.

       Refer to WIRING DIAGRAM .

       Continuity should exist  .

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

    OK or NG 

    OK: GO TO 12.

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

12. CHECK INTERMITTENT INCIDENT

Refer to "DESCRIPTION ".

OK or NG 

OK: Replace intake manifold adapter. Refer to INTAKE MANIFOLD .

NG: Repair or replace harness or connectors.