Diagnostic Procedure

Check Ground Connections
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. See Figure .
  Refer to GROUND INSPECTION .
OK or NG
1. OK: go to 2.
2. NG: Repair or replace ground connections.
Check Throttle Control Motor Relay Input Signal Circuit-I
1. Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.
  
  Fig 1: Identifying Conditions For Testing Throttle Control Motor Relay Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Testing Throttle Control Motor Relay Signal (W/DVOM)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: go to 10.
2. NG: go to 3.
Check Throttle Control Motor Relay Input Signal Circuit-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector E8.
4. Check harness continuity between ECM terminal 3 and IPDM E/R terminal 42.
  Refer to wiring diagram. See Figure .
  1. Continuity should exist .
5. 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 following.
- Harness connectors E19, F49
- Harness for open or short between ECM and IPDM E/R
  1. Repair open circuit or short to ground or short to power in harness or connectors.
Check Throttle Control Motor Relay Power Supply Circuit-I
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch OFF.
3. Check voltage between ECM terminal 104 and ground with CONSULT-II or tester.
  
  Fig 3: Testing Throttle Control Motor Relay Circuit-I (W/DVOM)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Voltage: Battery voltage
OK or NG
1. OK: go to 9.
2. NG: go to 6.
Check Throttle Control Motor Relay Power Supply Circuit-II
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E9.
3. Check harness continuity between ECM terminal 104 and IPDM E/R terminal 47. Refer to wiring diagram. See Figure .
  1. Continuity should exist .
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: go to 8.
2. NG: go to 7.
Detect Malfunctioning Part
Check the following.
- Harness connectors E211, M41
- Harness for open or short between ECM and IPDM E/R
  1. Repair open circuit or short to ground or short to power in harness or connectors.
Check Fuse
1. Disconnect 15A fuse.
2. Check 15A fuse for blown.
OK or NG
1. OK: go to 9.
2. NG: Replace 15A fuse.
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: Replace IPDM E/R. .
2. NG: Repair or replace harness or connectors.
Check Throttle Control Motor Output Signal Circuit For Open Or Short
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
3. Disconnect ECM harness connector. See Figure .
4. Check harness continuity between the following terminals.
  Refer to wiring diagram. See Figure .
  
  Fig 4: Identifying Electric Throttle Control Actuator Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: go to 11.
2. NG: Repair or replace.
Check Electric Throttle Control Actuator Visually
1. Remove the intake air duct.
2. Check if foreign matter is caught between the throttle valve and the housing.
OK or NG
1. OK: go to 12.
2. NG: Remove the foreign matter and clean the electric throttle control actuator inside. See Figure .
Check Throttle Control Motor
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: go to 13.
2. NG: go to 14.
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: go to 14.
2. NG: Repair or replace harness or connectors.
Replace Electric Throttle Control Actuator
1. Replace the electric throttle control actuator.
2. Perform THROTTLE VALVE CLOSED POSITION LEARNING .
3. Perform IDLE AIR VOLUME LEARNING .
  1. Inspection end