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Appendix D
© 2018 Avco Corporation. All Rights Reserved
Page 412
November 2018
TEO-540-C1A Engine Maintenance Manual
Fault ID
53
Fault Group
7
Fault Name
[FAULT: Cylinder 6 detonation
detected]
Fault
Description
Cylinder 6 excessive detonation
detected
Fault Lamp
NTO
Fault ID
54
Fault Group
7
Fault Name
[FAULT: Cylinder 7 detonation
detected]
Fault
Description
Cylinder 7 excessive detonation
detected
Fault Lamp
NTO
Fault ID
55
Fault Group
7
Fault Name
[FAULT: Cylinder 8 detonation
detected]
Fault
Description
Cylinder 8 excessive detonation
detected
Fault Lamp
NTO
Root Cause
The fault indicates that the number of detected detonation events for the cylinder over the
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
Troubleshooting Steps for Faults 48 thru 55
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 Group
8
Fault Name
[FAULT: Cylinder 1 CHT over
temperature]
Fault
Description
Cylinder 1 excessive CHT
Fault Lamp
TLO
Fault ID
57
Fault Group
8
Fault Name
[FAULT: Cylinder 2 CHT over
temperature]
Fault
Description
Cylinder 2 excessive CHT
Fault Lamp
TLO
Fault ID
58
Fault Group
8
Fault Name
[FAULT: Cylinder 3 CHT over
temperature]
Fault
Description
Cylinder 3 excessive CHT
Fault Lamp
TLO