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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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09/20/19

Message Overview:

Fault Message:

OPEN CKT - DE-PRIME VALVE/WIRING

Fault Code:

4960289APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-90-00
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 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/De-Oil Solenoid Valve (V1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: 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 as required and do close out.
    2. If system checks are good, continue with next step.

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

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

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

    1. If contamination or damage is found, go to step 20.
    2. If system checks are good, continue with next step.

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

  5. Perform a continuity check within the 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 the 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 show on the CAIMS PMAT.

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

    1. If messages shown on the CAIMS PMAT, troubleshoot the message first and continue with next step.
    2. If messages 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 >1 megohm
    V1P1-B Ground >1 megohm

    1. If the 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 show on the CAIMS PMAT.

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

    1. If messages shown on the CAIMS PMAT, troubleshoot the message first and continue with next step.
    2. If messages 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 megohm
    P802-53 V1P1-B >1 megohm

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness as required 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 show on the CAIMS PMAT.

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

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

  11. Perform a continuity check within the de-prime valve (V1P1) connector (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 as required 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 show on the CAIMS PMAT.

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

    1. If messages shown on the CAIMS PMAT, troubleshoot the message first and continue with next step.
    2. If messages 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 >1 megohm
    P802-53 Ground >1 megohm
    V1P1-A Ground >1 megohm
    V1P1-B Ground >1 megohm

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness as required 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 messages shown on the CAIMS PMAT, troubleshoot the message first and continue with next step.
    2. If messages 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 show on the CAIMS PMAT.

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

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

  17. Perform a continuity check within the 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 show on the CAIMS PMAT.

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

    1. If messages shown on the CAIMS PMAT, troubleshoot the message first and continue with next step.
    2. If messages 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 more than one megohm.

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

    1. If the resistance is not as mentioned above, replace engine branched wiring-harness 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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