Diagnosis Procedure

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: Identifying Ground Screws On Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.
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.

CHECK POWER SUPPLY CIRCUITS

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

SENSOR TERMINAL REFERENCE

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.

CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace crankshaft position sensor (POS).
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 7.

NG: Replace EVAP control system pressure sensor.
CHECK REFRIGERANT PRESSURE SENSOR
Refer to TROUBLE DIAGNOSIS .

OK or NG

OK: GO TO 8.

NG: Replace refrigerant pressure sensor.
CHECK APP SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 12.

NG: GO TO 9.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
4. Perform "IDLE AIR VOLUME LEARNING ".
  INSPECTION END
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.
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.
CHECK INTERMITTENT INCIDENT
Refer to "DESCRIPTION ".

OK or NG

OK: Replace intake manifold adapter.

NG: Repair or replace harness or connectors.