Diagnostic Procedure

RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
  1. : GO TO 2.
  Fig 1: Tightening Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK POWER SUPPLY
1. Disconnect throttle position sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Disconnecting Throttle Position Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between throttle position sensor terminal 1 and ground with CONSULT-II or tester.
  Voltage : Approximately 5V
OK or NG
1. OK : GO TO 3.
2. NG : Repair harness or connectors.
  
  Fig 3: Checking Voltage Between Throttle Position Sensor Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between throttle position sensor terminal 3 and engine ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK : GO TO 5.
2. NG : GO TO 4.
DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and throttle position sensor.
1. : Repair open circuit or short to power in harness or connectors.
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 23 and throttle position sensor terminal 2.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 6.
2. 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
1. OK : GO TO 7.
2. NG : Replace throttle position sensor. To adjust it, perform Basic Inspection .
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END.