Lycoming TEO-540-C1A Maintenance Manual page 544

Fault ID 426
Fault Low fuel injector pressure delta fault
Description
This fault indicates the fuel injector pressure delta is consistently below the minimum
Root Cause
allowable threshold
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If
yes, go to step 2. If no, go to step 6.
2. While engine is running, set aux fuel pump switch to on. Is fault still active? If yes, go to step 3. If no,
go to step 6.
3. Are there any active or logged fuel pressure sensor, MAP sensor, or aux fuel pump faults? If yes, go to
troubleshooting procedure for related fault. If no, go to step 4.
4. Inspect airframe fuel pump, fuel filter, fuel supply lines, fuel return lines, engine fuel pump, fuel rail,
fuel pressure regulator, and fuel manifold return lines for damage or obstructions. Replace any
components that are damaged or obstructed. Run the engine in accordance with the engine and aircraft
maintenance manuals. Is the fault active? If yes, go to step 5. If no, go to step 6.
5. With engine running, using the FST, monitor engine fuel pump and fuel rail pressure. Is fuel pump and
fuel rail pressure within specified limits in accordance with Appendix A of the TEO-540-C1A Engine
Installation and Operation Manual? If pump pressure is out of limits, replace fuel pump. If fuel rail
pressure is out of limits, replace fuel pressure regulator. Then go to step 6. If both are within limits,
contact Lycoming Engines.
6. Clear Service faults using the FST by following the steps outlined in the "Access the Field Service
Tool" section in Appendix C or the latest revision of SSP-118.
Fault ID 427
Fault Low fuel pressure with Aux Pump
Description active
Root Cause This fault indicates the fuel pump pressure is low with auxiliary pump active.
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If
yes, go to step 2. If no, go to step 6.
2. While engine is running, set aux fuel pump switch to on. Is fault still active? If yes, go to step 3. If no,
go to step 6.
3. Is there an active aux fuel pump output fault? If yes, go to corresponding troubleshooting procedure. If
no, go to step 4.
4. Inspect airframe fuel pump, fuel filter, fuel supply lines for proper operation, damage or obstructions in
accordance with aircraft maintenance manual. Replace any components that are not operating properly,
damaged or obstructed. Run the engine in accordance with the engine and aircraft maintenance
manuals. Is the fault active? If yes, go to step 5. If no, go to step 6.
5. With engine running, using the FST, monitor engine fuel pump and fuel rail pressure. Is fuel pump and
fuel rail pressure within specified limits in accordance with Appendix A of the TEO-540-C1A
Installation and Operation Manual? If pump pressure is out of limits, replace the fuel pump. If fuel
rail pressure is out of limits, replace fuel pressure regulator. Then go to step 6. If both are within limits,
contact Lycoming Engines.
6. Clear Service faults using the FST by following the steps outlined in the "Access the Field Service
Tool" section in Appendix C or the latest revision of SSP-118.
Appendix D
Page 514
Fault Group 54
Troubleshooting Steps
Fault Group 54
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: low fuel injector pressure
Fault Name
delta]
Fault Lamp
[FAULT: Low fuel pressure with
Fault Name
aux pump active]
Fault Lamp
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FFL
FFL
November 2018