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Home >> Nissan-Datsun >> 2009 >> Murano LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> P2101 Electric Throttle Control Function >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. 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 connector and ground.
      TERMINALS VOLTAGE REFERENCE

      ECM Ground Condition Voltage
      Connector Terminal
      F7 2 Ground Ignition switch OFF Approx. 0 V
      Ignition switch ON Battery voltage

      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.
      TERMINAL CONTINUITY REFERENCE

      IPDM E/R ECM Continuity
      Connector Terminal Connector Terminal
      F12 70 F7 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 or 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.
      TERMINAL CONTINUITY REFERENCE

      IPDM E/R ECM Continuity
      Connector Terminal Connector Terminal
      F12 54 F7 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 or short to ground or short to power in harness or connectors.

  5. CHECK FUSE
    1. Disconnect 15A fuse (No. 51) from IPDM E/R.
    2. Check 15A fuse for blown.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace 15A fuse.

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    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.
      TERMINAL CONTINUITY REFERENCE

      Electric throttle control actuator ECM Continuity
      Connector Terminal Connector Terminal
      F29 5 F7 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.
    2. Check if foreign matter is caught between the throttle valve (1) and the housing.

      Is the inspection result normal? 

      YES: GO TO 9.

      NO: Remove the foreign matter and clean the electric throttle control actuator inside.

      Fig 1: Identifying Electric Throttle Control Actuator And Throttle Valve
      G05889697Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
    2. Refer to "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

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