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: Location Of Body Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect electric throttle control actuator (1) harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Location Of Electric Throttle Control Actuator
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between electric throttle control actuator terminal 2 and ground with CONSULT-III or tester.
  Voltage: Approximately 5 V
  
  OK or NG
  
  OK: GO TO 3.
  
  NG: Repair open circuit or short to ground or short to power in harness or connectors.
  
  Fig 3: Checking Voltage Between Electric Throttle Control Actuator Terminal 2 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 36.
  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 4.
  
  NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following;
  Electric throttle control actuator terminal 1 and ECM terminal 33,
  
  Electric throttle control actuator terminal 3 and ECM terminal 34.
  
  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 5.
  
  NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 7.

NG: GO TO 6.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace the electric throttle control actuator. Refer to INTAKE MANIFOLD .

INSPECTION END
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END