Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Checking ECM Ground Connections
  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. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals.
  Refer to WIRING DIAGRAM .
  
  Fig 2: Electric Throttle Control Actuator Terminal Continuity Chart
  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.
5. Also check harness for short to ground and short to power.
OK or NG
- OK : GO TO 3.
- NG : Repair open circuit or short to ground or short to power in harness or connectors.
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