Diagnostic Procedure

CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect throttle position switch harness connector.
  
  Fig 1: Identifying Throttle Position Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between terminal 5 and engine ground with CONSULT-II or tester.
Voltage : Battery voltage

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M59, F27
- Fuse block (J/B) connector M27
- 10A fuse
- Harness for open or short between throttle position switch and fuse
  1. Repair harness or connectors.
CHECK INPUT SIGNAL CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 28 and terminal 6.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the harness for open or short between throttle position switch and ECM.
1. Repair open circuit or short to ground or short to power in harness or connectors.
ADJUST THROTTLE POSITION SWITCH IDLE POSITION
Check the following items. Refer to "Basic Inspection ".

Fig 3: Specification Chart
Courtesy of NISSAN MOTOR CO., U.S.A.
1. GO TO 6.
CHECK CLOSED THROTTLE POSITION SWITCH
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and turn ignition switch "ON".
3. Select "DATA MONITOR" mode with CONSULT-II.
  
  Fig 4: Scan Tool Display - Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check indication of "CLSD THL/P SW" under the following conditions.
  NOTE: Measurement must be made with closed throttle position switch installed in vehicle.
  
  If NG, adjust closed throttle position switch. Refer to "Basic Inspection ".
5. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace closed throttle position switch.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF".
3. Disconnect throttle position switch harness connector.
4. Check continuity between terminals 5 and 6 under the following conditions.
  
  Fig 5: Throttle Valve Condition Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: Checking Continuity Between Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  NOTE: Continuity measurement must be made with closed throttle position switch installed in vehicle.
  
  If NG, adjust closed throttle position switch. Refer to "Basic Inspection ".
5. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace closed throttle position switch.
OK or NG
1. OK: GO TO 7.
2. NG: Replace throttle position switch.
CHECK THROTTLE POSITION SENSOR
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and turn ignition switch ON.
3. Select "DATA MONITOR" mode with CONSULT-II.
  
  Fig 7: Scan Tool Display - Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage of "THRTL POS SEN" under the following conditions.
  NOTE: Voltage measurement must be made with throttle position sensor installed in vehicle.
  
  If NG, adjust closed throttle position switch. Refer to "Basic Inspection ".
5. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace throttle position sensor.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and turn ignition switch ON.
3. Check voltage between ECM terminal 23 (Throttle position sensor signal) and ground under the following conditions.
  
  Fig 8: Throttle Valve Condition Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 9: Checking Voltage Between ECM Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  NOTE: Voltage measurement must be made with throttle position sensor installed in vehicle.
  
  If NG, adjust closed throttle position switch. Refer to "Basic Inspection ".
4. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace throttle position sensor.
OK or NG
1. OK: GO TO 8.
2. NG: Replace throttle position sensor.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END.