Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. 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 three ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Loosen & Retighten Three Ground Screws On The Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 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: ECM Continuity Specification Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Electric Throttle Control Actuator
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 3.
- NG: Repair or replace.
CHECK THROTTLE CONTROL MOTOR
Refer to "COMPONENT INSPECTION ".

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

OK or NG
- OK: GO TO 5.
- 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 ".
  - : INSPECTION END