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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> 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: Identifying Body Ground (M70 And M16)
    G06303423Courtesy 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 3 and ground under the following conditions with CONSULT-III or tester.

    VOLTAGE CONNECTOR TERMINALS REFERENCE CHART

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

    OK or NG 

    OK: GO TO  10.

    NG: GO TO 3.

    Fig 2: Checking Voltage Between ECM Connector Terminal 3 And Ground
    G04900692Courtesy of NISSAN MOTOR CO., U.S.A.
  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 E8.
    4. Check harness continuity between ECM terminal 3 and IPDM E/R terminal 42.

      Refer to SYSTEM WIRING DIAGRAMS article.

      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 E12, F3
    • 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. Turn ignition switch OFF.
    3. Check voltage between ECM terminal 104 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 104 And Ground
    G04900691Courtesy 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 E9.
    3. Check harness continuity between ECM terminal 104 and IPDM E/R terminal 47.

      Refer to SYSTEM WIRING DIAGRAMS article.

      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 E108, M15
    • 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 15 A fuse.

  9. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

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

    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.
      • Illustration shows the view with intake air duct removed.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals.

      Refer to SYSTEM WIRING DIAGRAMS article.

      ECM CONNECTOR TERMINALS REFERENCE CHART

      Electric throttle control actuator terminal ECM terminal Continuity
      5 5 Should not exist.
      4 Should exist.
      6 5 Should exist.
      4 Should not exist.
      Fig 4: Identifying Electric Throttle Control Actuator Harness Connector
      G05210523Courtesy 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 malfunctioning part.

  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.

    This illustration shows the view with intake air removed.

    OK or NG 

    OK: GO TO 12.

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

    Fig 5: Identifying Throttle Valve
    G05210925Courtesy of NISSAN MOTOR CO., U.S.A.
  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 "DIAGNOSIS PROCEDURE ".

    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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