Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body.
  Refer to "GROUND INSPECTION ".
  
  Fig 1: Locating ECM Ground Screw
  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 RELAY SIGNAL CIRCUIT

Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.

THROTTLE CONTROL MOTOR RELAY SIGNAL

Ignition switch	Voltage
OFF	Approximately 0V
ON	Battery voltage (11 -14V)

OK or NG

OK : GO TO 8.
NG : GO TO 3.

Fig 2: Checking Voltage Between ECM Connector Terminal 3 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect throttle control motor relay.
  
  Fig 3: Locating 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
  Fig 4: Checking Voltage Between Throttle Control Motor Relay Connector Terminals 2, 5 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 5.
2. NG : GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E10, F48
- Fuse and fusible link box connector E23
- 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 exist.
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 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.
3. Disconnect ECM harness connector.
4. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
  
  Fig 5: Electric Throttle Control Actuator And ECM Terminals Continuity Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: 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.
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