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Home >> Nissan-Datsun >> 2011 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1148 To P2A03 (Qr25DE) >> DTC P2101 Electric Throttle Control Function >> Diagnosis Procedure
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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: Location Of Washer Tank, Fuse And Fusible Link Box And Body Ground E15
    G07144410Courtesy 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.

    TERMINAL VOLTAGE REFERENCE CHART

    Ignition switch Voltage
    OFF Approximately 0 V
    ON Battery voltage (11 - 14 V)
    Fig 2: Checking Voltage Between ECM Terminal 2 And Ground
    G07144411Courtesy 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
      G07144412Courtesy 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. For the fuse number, refer to "WIRING DIAGRAM ". For the fuse arrangement, refer to "IPDM E/R TERMINAL ARRANGEMENT ".
    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 .

      TERMINAL CONTINUITY REFERENCE CHART

      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: Location Of Electric Throttle Control Actuator
      G07144413Courtesy 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. Refer to "REMOVAL AND INSTALLATION ".
    2. Check if foreign matter is caught between the throttle valve (1) and the housing.
      • : Vehicle front
      • Electric throttle control actuator (2)
      Fig 5: Location Of Throttle Valve And Electric Throttle Control Actuator
      G07144414Courtesy 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, and then perform throttle valve closed position learning. Refer to "THROTTLE VALVE CLOSED POSITION LEARNING ".

  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

    Replace the electric throttle control actuator. Refer to "REMOVAL AND INSTALLATION ".

    INSPECTION END 

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