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Home >> Infiniti >> 2004 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1124 & P1126 Throttle Control Motor Relay >> Diagnostic Procedure
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Diagnostic 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-II or tester. See Figure .
      1. Voltage: Battery voltage 

    OK or NG

    1. OK: go to 5.
    2. NG: go to 2.

  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 wiring diagram. See Figure .
      1. Continuity should exist  .
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to 4.
    2. NG: go to 3.

  3. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E211, M41
    • Harness for open or short between ECM and IPDM E/R
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  4. Check Fuse 
    1. Disconnect 15A fuse.
    2. Check 15A fuse for blown.

    OK or NG

    1. OK: go to 8.
    2. NG: Replace 15A 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-II or tester. See Figure and Figure .

    OK or NG

    1. OK: go to 8.
    2. NG: go to 6.

  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 wiring diagram. See Figure .
      1. Continuity should exist  .
    5. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to 8.
    2. NG: go to 7.

  7. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E19, F49
    • Harness for open or short between ECM and IPDM E/R
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  8. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    OK or NG

    1. OK: Replace IPDM E/R. .
    2. NG: Repair or replace harness or connectors.

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