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(WARNING)
RED MESSAGE (CAUTION)
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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04/08/21

Message Overview:

Message Name:

OPN/SHRT CIRCUIT
(Service Message)

Message Code:

B3-006343

Associated CAS:

None

Reporting LRU: APU OIL T SNSR
System Description: 49-00-00
Schematic Diagram: 49-61-00
Wiring Diagram: 49-61-01 Sh 1
49-61-01 Sh 2

Message Description:

Auxiliary Power Unit (APU) Electronic Control Unit (ECU) is reporting an open or short circuit of the oil temperature sensor.

Possible Causes:

  • Auxiliary Power Unit (APU) Electronic Control Unit (ECU) (A39)
  • High Oil Temperature Sensor (RT01)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-000-801
Installation of the Auxiliary Power Unit (APU) Electronic Control Unit (ECU) AMM 49-61-01-400-801
Removal of the Oil Temperature Sensor AMM 49-91-01-000-801
Installation of the Oil Temperature Sensor AMM 49-91-01-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check between the APU ECU (A39) and the Oil Temp Sensor (RT01) for the following wires:

    From To Result
    Conn. A39AP1-4C Conn. RT01P1-A
    Conn. A39AP1-4D Conn. RT01P1-B

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wiring.

  2. Replace the Oil Temp Sensor (RT01). Is the fault message still present\?

    1. If NO, do close out.
    2. If YES, continue with next step.
      NOTE: The internal resistance of the Oil Temp Sensor can be measure (A - B). The resistance range is approximately between 75 Ω and 222 Ω. However, a satisfactory check is NOT a confirmation of a good Oil Temp Sensor.

  3. Replace APU ECU (A39).
  4. Do close out.

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