Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body.

   Refer to "GROUND INSPECTION ".

Fig 1: Locating M28 & M54 Body Ground Screws

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

OK or NG 

OK: GO TO  2.

NG: Repair or replace ground connections.

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

Fig 2: Checking Voltage Between Terminal No. 3 & Ground

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

OK or NG 

OK: GO TO  8.

NG: GO TO  3.

1. Turn ignition switch OFF.
2. Disconnect throttle control motor relay.
   Fig 3: 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.

   Voltage: Battery voltage 

Fig 4: Checking Voltage Between Throttle Control Motor Relay Terminals 2, 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO  5.

NG: GO TO  4.

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 battery

  : Repair open circuit or short to ground or short to power in harness or connectors.

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 3 and throttle control motor relay terminal 3.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. Also check harness for short to ground and short to power.

OK or NG 

OK: GO TO  6.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Check continuity between ECM terminal 104 and throttle control motor relay terminal 1.

   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  7.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO  11.

NG: Replace throttle control motor relay.

1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
Fig 5: Disconnecting Electric Throttle Control Actuator Harness Connector
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 .
   TERMINAL CONTINUITY REFERENCE
   
   

   Electric throttle control actuator terminal	ECM terminal	Continuity
   3	4	Should exist
   	5	Should not exist
   6	4	Should not exist
   	5	Should exist

5. Also check harness for short to ground and short to power.

OK or NG 

OK: GO TO  9.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Remove the intake air duct.
2. Check if foreign matter is caught between the throttle valve and the housing.

Fig 6: Checking Electric Throttle Control Actuator Visually

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

OK or NG 

OK: GO TO  10.

NG: Remove the foreign matter and clean the electric throttle control actuator inside.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO  11.

NG: GO TO  12.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT "

OK or NG 

OK: GO TO  12.

NG: Repair or replace harness or connectors.

1. Replace the electric throttle control actuator.
2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
3. Perform "IDLE AIR VOLUME LEARNING ".

   : INSPECTION END