Diagnostic Procedure

RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF
2. Loosen and retighten engine ground screws.
  1. GO TO 2.
Fig 1: Identifying Engine Ground Screws
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE CONTROL MOTOR RELAY SIGNAL CIRCUIT
Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.

Fig 2: ECM Terminal 3 And Ground Voltage Checking Conditions Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Voltage Between ECM Terminal 3 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 8.
2. NG: GO TO 3.
CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect throttle control motor relay.
  
  Fig 4: Disconnecting Throttle Control Motor Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between throttle control motor relay terminals 2, 5 and ground.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
Fig 5: Checking Voltage Between Throttle Control Motor Relay Terminals 2, 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E10, F48
- 15A fuse
- Harness for open or short between throttle control motor relay and fuse
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 3 and throttle control motor relay terminal 3.
  Refer to WIRING DIAGRAM .
  1. Continuity should exits.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 6.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 104 and throttle control motor relay terminal 1.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 7.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK THROTTLE CONTROL MOTOR RELAY
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 11.
2. NG: Replace throttle control motor relay.
CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
  
  Fig 6: Electric Throttle Control Actuator Terminals Continuity Conditions Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals.
  Refer to WIRING DIAGRAM .
  
  Fig 7: Identifying Electric Throttle Control Actuator
  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 9.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
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 10.
2. NG: Remove the foreign matter and clean the electric throttle control actuator inside.
Fig 8: Identifying Electric Throttle Control Actuator
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE CONTROL MOTOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 11.
2. NG: GO TO 12.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: GO TO 12.
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