Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to Ground Inspection .
  
  Fig 1: Locating Two Ground Screws On Body (DTC P01128)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace ground connections.
CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect electric throttle control actuator harness connector.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following terminals.
  Refer to Wiring Diagram.
  
  Fig 2: Continuity Chart Of Throttle Control Motor Output Signal Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Disconnecting Electric Throttle Control Actuator Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace.
CHECK THROTTLE CONTROL MOTOR
Refer to Component Inspection .

OK or NG
1. OK: GO TO 4.
2. NG: GO TO 5.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: GO TO 5.
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