Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

1. CHECK GROUND CONNECTION
   1. Turn ignition switch OFF.
   2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
   1. Check the voltage between ECM harness connectors.

      ECM				Condition	Voltage
      +		-
      Connector	Terminal	Connector	Terminal
      F14	2	E10	112	Ignition switch OFF	Approx. 0 V
      				Ignition switch ON	Battery voltage

      Fig 1: Checking Voltage Between ECM Harness Connectors F14 And E10

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 3.

3. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Disconnect IPDM E/R harness connector.
   4. Check the continuity between IPDM E/R harness connector and ECM harness connector.

      IPDM E/R		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F10	70	F14	15	Existed

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

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

4. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
   1. Check the continuity between IPDM E/R harness connector and ECM harness connector.

      IPDM E/R		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F10	54	F14	2	Existed

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

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK FUSE
   1. Disconnect 15 A fuse (No. 43) from IPDM E/R.
   2. Check if 15 A fuse is blown.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace 15 A fuse.

6. CHECK INTERMITTENT INCIDENT

   Refer to "INTERMITTENT INCIDENT ".

   Is the inspection result normal? 

   YES: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION .

   NO: Repair or replace harness or connectors.

7. 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 the continuity between electric throttle control actuator harness connector and ECM harness connector.

      Electric throttle control actuator		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      F57	5	F14	5	Not existed
      			6	Existed
      	6		5	Existed
      			6	Not existed

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

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Repair or replace malfunctioning part.

8. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
   1. Remove the intake air duct. Refer to "REMOVAL AND INSTALLATION ".
   2. Check if foreign matter is caught between the throttle valve (1) and the housing.
      Fig 2: Identifying Throttle Valve And Electric Throttle Control Actuator

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Remove the foreign matter and clean the electric throttle control actuator inside, and then perform throttle valve closed position learning. Refer to "THROTTLE VALVE CLOSED POSITION LEARNING: SPECIAL REPAIR REQUIREMENT ".

9. CHECK THROTTLE CONTROL MOTOR

   Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO 10.

   NO: GO TO  11.

10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Repair or replace harness or connectors.

11. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
    1. Replace electric throttle control actuator. Refer to INTAKE MANIFOLD COLLECTOR .
    2. Refer to "SPECIAL REPAIR REQUIREMENT ".

       : INSPECTION END