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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Screws
      G08690763Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I 
    1. Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT or tester.
      Ignition switch Voltage
      OFF Approximately 0 V
      ON Battery voltage (11 - 14 V)
      Fig 2: Checking Voltage Between ECM Terminal 3 And Ground
      G08690764Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  9.

      NG: GO TO 3.

  3. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Check voltage between ECM terminal 104 and ground with CONSULT or tester.

      Voltage: Battery voltage 

      OK or NG 

      OK: GO TO  6.

      NG: GO TO 4.

      Fig 3: Checking Voltage Between ECM Terminal 104 And Ground
      G08690765Courtesy of NISSAN NORTH AMERICA, INC.
  4. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E122.
    3. Check harness continuity between ECM terminal 104 and IPDM E/R terminal 47.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

      OK or NG 

      OK: GO TO 5.

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

  5. CHECK FUSE 
    1. Disconnect 20 A fuse.
    2. Check 20 A (No. 52) fuse for blown.

      OK or NG 

      OK: GO TO  8.

      NG: Replace 20 A fuse.

  6. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E119.
    3. Check harness continuity between ECM terminal 3 and IPDM E/R terminal 6.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

      OK or NG 

      OK: GO TO  8.

      NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between ECM and IPDM E/R

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

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NG: Repair or replace harness or connectors.

  9. 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 .

      Electric throttle control actuator terminal ECM terminal Continuity
      5 5 Should not exist
      4 Should exist
      6 5 Should exist
      4 Should not exist
    5. Also check harness for short to ground and short to power.

      OK or NG 

      OK: GO TO 10.

      NG: Repair or replace.

      Fig 4: Identifying Electric Throttle Control Actuator, Throttle Position Sensor Harness Connector
      G08690766Courtesy of NISSAN NORTH AMERICA, INC.
  10. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 
    1. Remove the intake air duct. Refer to AIR CLEANER AND AIR DUCT .
    2. Check if foreign matter is caught between the throttle valve and the housing.

      OK or NG 

      OK: GO TO 11.

      NG: 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 ".

      Fig 5: Identifying Electric Throttle Control Actuator And Throttle Valve
      G08690767Courtesy of NISSAN NORTH AMERICA, INC.
  11. CHECK THROTTLE CONTROL MOTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 12.

    NG: GO TO  13.

  12. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: GO TO 13.

    NG: Repair or replace harness or connectors.

  13. 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 ".

      :INSPECTION END 

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