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(WARNING)
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AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
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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Quick Links

09/20/19

Message Overview:

Fault Message:

SIG SHORT - OIL TEMP SENSOR/WIRING

Fault Code:

4960241APU

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 Oil Temperature Sensor to the Full-Authority Digital Engine-Controller (FADEC) are out of the accepted range. This shows a possible open in the Oil Temperature Sensor low input, the Oil Temperature Sensor input or the Oil Temperature Sensor high input.

Possible Causes:

  • Oil Temperature Sensor (MT6)
  • 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 Oil Temperature Sensor AMM 49-90-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Oil Temperature Sensor AMM 49-90-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Open the Auxiliary Power Unit (APU) Access Doors (321BB) AMM 52-43-00-010-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Close the Auxiliary Power Unit (APU) Access Doors (321BB) AMM 52-43-00-410-801 [ 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 any of the messages that follow show on the CAIMS PMAT

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  3. Examine the oil temperature sensor (MT6) receptacle for contamination and damage.

    1. If contamination or damage is found, go to step 16.
    2. If contamination or damage is not found, continue with next step.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  5. Perform a continuity check within oil temperature sensor (MT6) receptacle (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    MT6P1-A MT6P1-B 50 to 250 ohms

    1. If the resistance value is not within the range, go to step 16.
    2. If the resistance value is within the range, continue with next step.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  7. Perform a continuity check between oil temperature sensor (MT6) and the ground shell (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    MT6P1-A Ground >1 megohm
    MT6P1-B Ground >1 megohm

    1. If resistance value is not more than one megaohm for each wire, go to step 16.
    2. If resistance value is more than one megaohm for each wire, continue with next step.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  9. Perform a continuity check within oil temperature sensor (MT6) connector (WM 49-12). The resistance should measure as follows:

    From To Expected Result Result
    MT6P1-A MT6P1-B >1 megohm

    1. If resistance value is not more than one megaohm for each wire, replace the engine branched wiring-harness and do close out.
    2. If resistance value is more than one megaohm for each wire, continue with next step.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  11. 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
    P802-6 Ground >1 megohm
    P802-7 Ground >1 megohm
    P802-56 Ground >1 megohm
    MT6P1-A Ground >1 megohm
    MT6P1-B Ground >1 megohm

    1. If resistance value is not more than one megaohm for each wire, replace the engine branched wiring-harness and do close out.
    2. If resistance value is more than one megaohm for each wire, continue with next step.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  13. Perform a wiring check between aircraft wiring harness J802 and P802.

    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.

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

    • SIG SHORT - OIL TEMP SENSOR/WIRING
    • GND SHORT - OIL TEMP SENSOR/WIRING

    1. If the fault message exists, troubleshoot it first and continue with next step.
    2. If the fault message does not exists, continue with next step.

  15. 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
    J802-6 Ground >1 megohm
    J802-7 Ground >1 megohm
    J802-56 Ground >1 megohm
    A108BP1-J6 Ground >1 megohm
    A108BP1-H6 Ground >1 megohm
    A108BP1-G6 Ground >1 megohm

    1. If resistance value is not more than one megaohm for each wire, replace the engine branched wiring-harness and do close out.
    2. If resistance value is more than one megaohm for each wire, continue with next step.

  16. Replace Oil Temperature Sensor (MT6).
  17. Do close out.

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