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Home >> Nissan-Datsun >> 2008 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P1148 To P2A03 (Qr25DE) >> DTC P2101 Electric Throttle Control Function >> Diagnostic Procedure
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Diagnostic 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 Body Ground Connections
      G04926182Courtesy 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.

    TERMINALS VOLTAGE CHART

    Ignition switch Voltage
    OFF Approximately 0V
    ON Battery voltage (11 - 14V)
    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 

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 6.

    Fig 3: Checking Voltage Between ECM Terminal 15 And Ground
    G04926184Courtesy of NISSAN MOTOR CO., U.S.A.
  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 15A fuse.
    2. Check 15A fuse for 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. Fig 4: Identifying Electric Throttle Control Actuator
      G04926185Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals.

      Refer to WIRING DIAGRAM .

      TERMINALS CONTINUITY 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.
    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)
      3. 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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