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Home >> Nissan-Datsun >> 2010 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - DTCS P1148 To P2A03 (Qr25DE) >> DTC P2101: Electric Throttle Control Function >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying Ground Screws On Body
      G06551975Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I

    Check voltage between ECM terminal 2 and ground under the following conditions with CONSULT-III or tester.

    VOLTAGE SPECIFICATION

    Ignition switch Voltage
    OFF Approximately 0 V
    ON BATTERY VOLTAGE (11 - 14 V)
    Fig 2: Checking Voltage Between ECM Terminal 2 And Ground
    G04925554Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  10.

    NG: GO TO 3.

  3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector E43.
    4. Check continuity between ECM terminal 2 and IPDM E/R terminal 8. Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

      OK or NG 

      OK: GO TO  5.

      NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E17, F10
    • 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.

  5. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I
    1. Reconnect all harness connectors disconnected.
    2. Check voltage between ECM terminal 15 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 3: Checking Voltage Between ECM Terminal 15 And Ground
      G04925553Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO  9.

      NG: GO TO 6.

  6. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E46.
    3. Check harness continuity between ECM terminal 15 and IPDM E/R terminal 46. 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 E3, F2
    • 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 FUSE
    1. Disconnect 15 A fuse.
    2. Check if 15 A fuse is blown.

      OK or NG 

      OK: GO TO 9.

      NG: Replace 15A fuse.

  9. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    OK: Replace IPDM E/R. Refer to IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) .

    NG: Repair or replace harness or connectors.

  10. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
    1. Turn ignition switch OFF.
    2. Disconnect electric throttle control actuator (1) harness connector.
      • <=: Vehicle front
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
      CONTINUITY SPECIFICATION

      Electric throttle control actuator terminal ECM terminal Continuity
      5 5 Should not exist.
      6 Should exist.
      6 5 Should exist.
      6 Should not exist.
      Fig 4: Identifying Electric Throttle Control Actuator Harness Connector
      G04926185Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Also check harness for short to ground and short to power.

      OK or NG 

      OK: GO TO 11.

      NG: Repair or replace.

  11. 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.
      • <=: Vehicle front
      • Electric throttle control actuator (2)
        Fig 5: Identifying Throttle Valve And Electric Throttle Control Actuator
        G04926149Courtesy of NISSAN MOTOR CO., U.S.A.

        OK or NG 

        OK: GO TO 12.

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

  12. CHECK THROTTLE CONTROL MOTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 13.

    NG: GO TO  14.

  13. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    OK: GO TO 14.

    NG: Repair or replace harness or connectors.

  14. 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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