Diagnostic Procedure

CHECK GROUND CONNECTIONS
Models with FDC system, navigation system or telephone
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Identifying Body Ground Screws (Models With FDC System)
  Courtesy of NISSAN MOTOR CO., U.S.A.
Models without FDC system, navigation system and telephone
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 2: Identifying Body Ground Screws (Models Without FDC System)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector.
  
  Fig 3: Identifying Electric Throttle Control Actuator
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between electric throttle control actuator terminal 6 and ground with CONSULT-III or tester.
  
  Fig 4: Checking Voltage Between Electric Throttle Control Actuator Terminal 6 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approximately 5V
OK or NG

OK: GO TO 3.

NG: Repair open circuit or short to ground or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 3 and ECM terminal 40 (bank 1) or 48 (bank 2).
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
4. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 4.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following;
  ECM terminal 30 (bank 1) or 31 (bank 2) and electric throttle control actuator terminal 4,
  
  ECM terminal 34 (bank 1) or 35 (bank 2) and electric throttle control actuator terminal 5.
  
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
2. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 5.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE POSITION SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 7.

NG: GO TO 6.
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
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END