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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> DTC P2100, P2103 Throttle Control Motor Relay >> Diagnosis Procedure
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Diagnosis Procedure

  1. 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-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 2.

    Fig 1: Checking Voltage Between ECM Terminal 104 And Ground
    G04900691Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E9.
    3. Check 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  4.

    NG: GO TO 3.

  3. 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.

  4. CHECK FUSE
    1. Disconnect 15 A fuse.
    2. Check if 15 A fuse is blown.

    OK or NG 

    OK: GO TO  8.

    NG: Replace 15 A fuse.

  5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
    1. 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  8.

    NG: GO TO 6.

    Fig 2: Checking Voltage Between ECM Connector Terminal 3 And Ground
    G04900692Courtesy of NISSAN MOTOR CO., U.S.A.
  6. 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 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  8.

    NG: GO TO 7.

  7. 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.

  8. 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.

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