Lycoming TEO-540-C1A Maintenance Manual page 446

Fault ID 76
Fault
Cylinder 5 injection output failure
Description
Fault ID 77
Fault
Cylinder 6 injection output failure
Description
Fault ID 78
Fault
Cylinder 7 injection output failure
Description
Fault ID 79
Fault
Cylinder 8 injection output failure
Description
This fault occurs to indicate inability to actuate the injector as desired due to a circuit fault.
The circuit fault may be internal to the ECU (drive stage) or external to the ECU (load or
harness).
The fault is set under any one of the following conditions:
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Root Cause
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1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If
yes or no, continue. Does the behavior of the engine correspond to the fault (missing)? If yes, continue.
If no, go to step 3. Are there active faults for other cylinders, or other cylinders behaving the same as
the affected cylinder? If yes, go to step 5. If no, go to step 2.
2. Are there faults on both primary and secondary channels for the same injector? If yes, replace the
injector. If no, go to step 6.
3. Using the FST, download active and service fault logs. Go to step 4.
4. Review logs to determine which fault was set, and if there are more than one fault. If there are no active
faults, but fault(s) keep reoccurring, then if fault is for one injector, go to step 2. If there are faults for
multiple injectors, go to step 5.
5. If multiple cylinders and/or channels for multiple injectors were found to be malfunctioning in step 1, or
found in step 4, inspect harness for damage (eg...burned, broken or frayed wires, cracked or broken
connectors). If damage found, contact Lycoming. If no damage found, replace the ECU.
6. Inspect injector harness connection for any damage (eg...burned, broken or frayed wires, cracked or
broken connectors). Contact Lycoming if harness damage is found. If no damage is found, go to step 7.
7. Complete a continuity test of the harness from the harness injector connector to ECU connector A001-
P3, and A001-P4, using the engine system schematic. If the continuity check fails, isolate to affected
harness by disconnecting the firewall connection, then contact Lycoming Engines. If the continuity
check is good, replace the ECU.
Appendix D
Page 416
Fault Group
Fault Group
Fault Group
Fault Group
The actuator or the drive stage is Open-circuit
The actuator is short-circuited
Low Side Drive (LSD) is shorted to the GND
High Side Drive (HSD) is shorted to the GND
LSD is shorted to the V Supply
HSD is shorted to the V Supply
Troubleshooting Steps for Faults 72 thru 29
TEO-540-C1A Engine Maintenance Manual
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
[FAULT: Cylinder 5 injection output
failure]
NTO
[FAULT: Cylinder 6 injection output
failure]
NTO
[FAULT: Cylinder 7 injection output
failure]
NTO
[FAULT: Cylinder 8 injection output
failure]
NTO
November 2018