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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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09/13/19

Message Overview:

Fault Message:

VOLTS TO START MOTOR OUT HIGH

Fault Code:

4960113APU

Associated CAS:

None

Reporting LRU: Full-Authority Digital Engine-Controller (FADEC)
System Description: 49-40-00
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 start relay feedback voltage is more than 45 volts. This is out of the expected range of the Full-Authority Digital Engine-Controller (FADEC).

Possible Causes:

  • Auxiliary Power Unit (APU) Full-Authority Digital Engine-Controller (FADEC) (A108)
  • Auxiliary Power Unit (APU) Starter Motor (B55) (MPE3)
  • 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 Starter Motor AMM 49-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Starter Motor AMM 49-42-01-400-801 [ 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 there is bare wiring, kinks, worn areas or other damage, replace engine branched wiring-harness and do close out.
    2. If NOT, continue with next step.

  2. Check if the VOLTS TO START MOTOR OUT HIGH still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  3. Examine the starter motor terminals for contamination and damage.

    1. If contaminated or damaged, go to step 13.
    2. If not contaminated or damaged, continue with next step.

  4. Check if the VOLTS TO START MOTOR OUT HIGH still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  5. Perform a continuity check between the negative and positive terminals on the starter motor (MPE3) (WM 49-12) as follows:

    From To Expected Result Result
    MPE3-NEG MPE3-POS less than one ohm

    1. If the measurement fails, go to step 13.
    2. If the measurement is good, continue with next step.

  6. Check if the VOLTS TO START MOTOR OUT HIGH still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  7. Perform a continuity check between the pins of the connectors as follows (WM 49-12):

    From To Expected Result Result
    APU P1-4 positive cable less than one ohm
    APU P1-5 negative cable less than one ohm

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

  8. Check if the VOLTS TO START MOTOR OUT HIGH still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

  9. Make sure there is no short between each pin 4 and 5, and the connector shell of P1 (WM 49-12).

    1. If there is short, replace the engine branched wiring-harness and do close out.
    2. If there is no short, continue with next step.

  10. Check if the VOLTS TO START MOTOR OUT HIGH still shows on the CAIMS PMAT.

    1. If NO, do close out.
    2. If YES, continue with next step.

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

    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.

  12. Make sure there is no short between each pin 4 and 5, and the connector shell of J802 (WM 49-61).

    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.

  13. Replace starter motor (MPE3).
  14. Do close out.

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