Lycoming TEO-540-C1A Maintenance Manual page 442

Fault ID 53
Fault Cylinder 6 excessive detonation
Description detected
Fault ID 54
Fault Cylinder 7 excessive detonation
Description detected
Fault ID 55
Fault Cylinder 8 excessive detonation
Description detected
The fault indicates that the number of detected detonation events for the cylinder over the
Root Cause most recent 100 firing cycles has exceeded the calibrated threshold. The fault will become
inactive if the number of detected detonation events fall back under the threshold
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If
yes, does the behavior of the engine correspond to the fault (Is it knocking)? If yes, is it detonating on
more than one cylinder? If yes to all questions, go to step 2. If there is no detonation, go to step 4.
2. Using the FST, download active and service fault logs.
3. Review logs to determine if there are any faults for the following sub-systems in the active or service
fault logs and go to the step that corresponds to the fault:
a. Fuel Pump
b. Injector
If faults are found for step 3a, complete steps 5 and 6. If faults are found for step 3b, complete step 7.
4. Swap detonation sensor with another cylinder. If fault does not move with sensor, complete a continuity
check of harness from knock sensor connector to ECU connector using the engine system schematic. If
the continuity check fails, isolate to affected harness by disconnecting firewall harness and repeating the
continuity check, then contact Lycoming Engines. If the continuity check passes, go to step 5.
5. Verify appropriate engine fuel outlet pressure and fuel rail pressure are achieved per Appendix A of the
TEO-540-C1A Installation and Operation Manual.
6. Inspect aircraft fuel system for any blockage that may result in fuel starvation at the fuel rails per the
"Fuel System Inspection Checklist in Chapter 73-10 and purge the fuel system if necessary.
7. Verify fuel injector connector is seated on injector. If so, swap injector with another cylinder. Does the
fault move with the injector? If yes, replace the injector. If no, complete a continuity check of harness
from fuel injector connector to ECU connector using the engine system schematic. If the continuity
check fails, isolate to affected harness by disconnecting firewall harness and repeating the continuity
check, then contact Lycoming Engines.
Fault ID 56
Fault
Cylinder 1 excessive CHT
Description
Fault ID 57
Fault
Cylinder 2 excessive CHT
Description
Fault ID 58
Fault
Cylinder 3 excessive CHT
Description
Appendix D
Page 412
Fault Group 7
Fault Group 7
Fault Group 7
Troubleshooting Steps for Faults 48 thru 55
Fault Group 8
Fault Group 8
Fault Group 8
TEO-540-C1A Engine Maintenance Manual
[FAULT: Cylinder 6 detonation
Fault Name
detected]
Fault Lamp
[FAULT: Cylinder 7 detonation
Fault Name
detected]
Fault Lamp
[FAULT: Cylinder 8 detonation
Fault Name
detected]
Fault Lamp
[FAULT: Cylinder 1 CHT over
Fault Name
temperature]
Fault Lamp
[FAULT: Cylinder 2 CHT over
Fault Name
temperature]
Fault Lamp
[FAULT: Cylinder 3 CHT over
Fault Name
temperature]
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
NTO
NTO
NTO
TLO
TLO
TLO
November 2018