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09/17/19

Message Overview:

Fault Message:

SHORT - FCU/FCU TORQUE MOTOR WRG

Fault Code:

4960179APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-30-00
Schematic Diagram: 49-61-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 49-12-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]
49-61-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

The signals from the Torque Motor Metering Valve, of the fuel control unit, to the Full-Authority Digital Engine-Controller (FADEC) are not within the expected range. This shows a possible short in the Torque Motor Metering Valve or the engine branched wiring-harness.

Possible Causes:

  • Fuel Control Unit (A3)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Engine Branched Wiring-Harness AMM 49-12-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Engine Branched Wiring-Harness AMM 49-12-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Fuel Control Unit AMM 49-30-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Control Unit AMM 49-30-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Full-Authority Digital Engine-Controller (FADEC) AMM 49-61-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Examine the engine branched wiring-harness for bare wiring, kinks, worn areas and other damage (WM 49-12).

    1. If the engine branched wiring-harness is not acceptable, replace engine branched wiring-harness and do close out.
    2. If SHORT - FCU/FCU TORQUE MOTOR WRG still shows on the CAIMS PMAT, continue with next step.

  2. Examine the fuel control unit (A3) receptacle for contamination and damage.

    1. If fuel control unit (A3) receptacle is contaminated or damaged, go to step 8.
    2. If SHORT - FCU/FCU TORQUE MOTOR WRG still shows on the CAIMS PMAT, continue with next step.

  3. Perform a continuity check between the fuel control unit (A3) receptacle (WM 49-12) as follows:

    From To Expected Result Result
    A3P1-C A3P1-D 30 - 40 ohms

    1. If checks are not good, repair defective wiring as required and do close out.
    2. If checks are good, continue with next step.

  4. Make sure there is no short between each A3P1-C and A3P1-D, and the connector shell of A3 receptacle (WM 49-12).

    1. If short, go to step 8.
    2. If SHORT - FCU/FCU TORQUE MOTOR WRG still shows on the CAIMS PMAT, continue with next step.

  5. Make sure there is no short between each P1-41 and P1-42, and the connector shell of P1 (WM 49-12).

    1. If checks are not good, repair defective wiring as required and do close out.
    2. If SHORT - FCU/FCU TORQUE MOTOR WRG still shows on the CAIMS PMAT, continue with next step.

  6. Make sure there is no short between each J802-41 and J802-42, and the connector shell of J802 (WM 49-61).

    1. If checks are not good, repair defective wiring as required and do close out.
    2. If checks are good, continue with next step.

  7. Make sure SHORT - FCU/FCU TORQUE MOTOR WRG does not show on the CAIMS PMAT.

    1. If checks are not good, repair defective wiring as required and do close out.
    2. If checks are good, continue with next step.

  8. Replace Fuel Control Unit.
  9. Do close out.

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