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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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04/22/21

Message Overview:

Message Name:

OIL PRESSURE SENSOR 1B

Message Code:

B3-303644

Associated CAS:

None

Reporting LRU: L ENG OIL PRES
System Description: 79-30-00
Schematic Diagram: 79-31-00
Wiring Diagram: None

Message Description:

Left engine oil pressure sensor fault 1B.

[MCID 1002]
Oil Pressure Sensor 1B.
Detection of a fault in the oil pressure sensor harness between the oil pressure sensor and the ECU B. The ECU B cannot support full system operation.

Possible Causes:

  • Oil Pressure Transducer
  • Wiring Harness (W6)
  • Wiring Harness (W4)
  • Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit A (ECU) (A43)

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Engine Electronic Control Unit (ECU) AMM 76-10-05-000-801
Installation of the Engine Electronic Control Unit (ECU) AMM 76-10-05-400-801
Removal of the Oil Pump AMM 79-21-01-000-802
Installation of the Oil Pump AMM 79-21-01-400-802
Removal of the Oil Filter AMM 79-21-05-000-801
Installation of the Oil Filter AMM 79-21-05-400-801
Removal of the Chip Detector AMM 79-21-09-000-801
Installation of the Chip Detector AMM 79-21-09-400-801
Removal of the Oil Filter Bypass-Indicator AMM 79-31-01-000-802
Installation of the Oil Filter Bypass-Indicator AMM 79-31-01-400-802
Removal of the Oil Temperature Transducer AMM 79-31-05-000-801
Installation of the Oil Temperature Transducer AMM 79-31-05-400-801
Removal of the Oil Pressure Transducer AMM 79-31-09-000-801
Installation of the Oil Pressure Transducer AMM 79-31-09-400-801
Removal of the Oil Level Probe AMM 79-31-13-000-801
Installation of the Oil Level Probe AMM 79-31-13-400-801
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Isolate per the Light Engine Maintenance Manual Subtask 72-00-00-810-162-A01, System Check 4, and MCID 1002.
  2. Disconnect and examine the OIL PRESS connector W4P12 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal).
  3. Apply 28 VDC to the system.
  4. Do a check to measure supply voltage at the pressure sensor as shown in the list below.

    Connector Pins Reading
    Input Check W4P12 1, 2 28 VDC
    W4P12 7, 8 28 VDC
    Output Check W4P12 3, 4 0.325 to 0.675 VDC
    W4P12 9, 10 0.325 to 0.675 VDC

  5. With power removed, do a internal short check at the connector as shown in the list below:

    Connector: To: From:
    W4P12 1 2
    W4P12 7 8

  6. Disconnect and examine the INTERFACE connector W4P1 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal).

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