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WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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04/01/25

Message Overview:

Message Name:

SHORT CKT - DE-PRIME VALVE/WIRING

Message Code:

4960288APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-90-00 - OIL
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] SSM 49-61-00-101 - APU Automatic Control System
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 49-12-01 - Sheet 1 - Harness - ALL
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-12-01 - Sheet 2 - Harness - ALL
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01 - Sheet 1 - Control - 9002-9129
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01 - Sheet 2 - Fadec Interface - 9002-9129
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01-1 - Sheet 1 Control - 9159-9249
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01-1 - Sheet 1 Control - 9250-9431
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01-1 - Sheet 1 Control - 9127-9129
[ Global Express ]  [ G5000 ]  [ Global XRS ] 49-61-01-1 - Sheet 1 Control - 9130-9249

Message Description:

The signals from the De-prime Valve to the Full-Authority Digital Engine-Controller (FADEC) are out of the accepted range. This shows a possible short or open between or in the signal lines.

Possible Causes:

  • Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC) (A108)
  • De-Prime Valve (V1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

Quick Links:

APU Safety Precautions AMM 49-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
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 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 ]
Removal of the De-Prime Valve AMM 49-90-24-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the De-Prime Valve AMM 49-90-24-400-801 [ 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 there is bare wiring, kinks, worn areas or other damage, replace engine branched wiring-harness and do close out.
    2. If there is no bare wiring, kinks, worn areas or other damage, continue with next step.

  2. Check for any of the messages that follow shows on the CAIMS PMAT.

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  3. Examine the de-prime valve (V1) receptacle for contamination and damage.

    1. If there is a contamination or damage, go to step 20.
    2. If there is no contamination or damage, continue with next step.

  4. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  5. Perform a continuity check between the pins of de-prime valve (V1) receptacle (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    V1P1-A V1P1-B 15-25 ohms

    1. If resistance is not as mentioned above, go to step 20.
    2. If the resistance is as mentioned above, continue with next step.

  6. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  7. Perform a continuity check between each pin that follows and the ground shell (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    V1P1-A Ground Shell >1 megohm
    V1P1-B Ground Shell >1 megohm

    1. If resistance is not as mentioned above, go to step 20.
    2. If the resistance is as mentioned above, continue with next step.

  8. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  9. Perform a continuity check between the pins of the connectors that follow (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    P802-52 V1P1-A <1 ohm
    P802-53 V1P1-B <1 ohm

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  10. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  11. Perform a continuity check between the pins of the de-prime valve connector (V1P1) (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    V1P1-A V1P1-B >1 megohm

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  12. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  13. Perform a continuity check between each pin that follows and the ground shell (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    P802-52 Ground Shell >1 megohm
    P802-53 Ground Shell >1 megohm
    V1P1-A Ground Shell >1 megohm
    V1P1-B Ground Shell >1 megohm

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  14. Check for any of the messages that follow still show on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  15. Perform wiring checks between aircraft wiring harness (J802) and FADEC (A108BP1).

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

  16. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  17. Perform a continuity check between the pins of J802 connector (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    J802-52 J802-53 >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  18. Check for any of the messages that follow still shows on the CAIMS PMAT.

    • SHORT CKT - DE-PRIME VALVE/WIRING
    • OPEN CKT - DE-PRIME VALVE/WIRING

    1. If the messages are shown on the CAIMS PMAT, troubleshoot the messages first and continue with next step.
    2. If the messages are not shown on the CAIMS PMAT, continue with next step.

  19. Perform a continuity check between each pin that follows and the ground shell (WM 49-61). The resistance should measure as follows:

    From To Expected Result Result
    J802-52 Ground Shell >1 megohm
    J802-53 Ground Shell >1 megohm
    A108BP1-116 Ground Shell >1 megohm
    A108BP1-117 Ground Shell >1 megohm

    1. If the resistance is not as mentioned above, repair defective wiring as required and do close out.
    2. If the resistance is as mentioned above, continue with next step.

  20. Replace De-prime valve (V1).

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  21. Replace FADEC.
  22. Do close out.

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