Appendix D
© 2018 Avco Corporation. All Rights Reserved
Page 404
November 2018
TEO-540-C1A Engine Maintenance Manual
Fault ID
20
Fault Group
3
Fault Name
[FAULT: ALIGNMENT]
Fault
Description
Memory Alignment Exception
Fault Lamp
NTO
Root Cause
This fault indicates an alignment exception Interrupt Vector Register 5 (IVOR5) from
processor possibly due to an ECU hardware issue.
Troubleshooting Steps
1.
With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active? If no, go to step 3. If yes, go to step 2.
2.
Contact Lycoming Personnel to have the ECU reprogrammed. Is fault active or reprogram
unsuccessful? If no, go to step 3. If yes, replace the ECU.
3.
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.
4.
If fault repeats, replace the ECU.
Fault ID
21
Fault Group
3
Fault Name
[FAULT: PROGRAM]
Fault
Description
Program Exception
Fault Lamp
NTO
Root Cause
This fault indicates a program exception Interrupt Vector Register 6 (IVOR6) from
processor possibly due to an ECU hardware issue.
Troubleshooting Steps
1.
With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active? If no, go to step 3. If yes, go to step 2.
2.
Contact Lycoming Personnel to have the ECU reprogrammed. Is fault active or reprogram
unsuccessful? If no, go to step 3. If yes, replace the ECU.
3.
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.
4.
If fault repeats, replace the ECU.
Fault ID
22
Fault Group
3
Fault Name
[FAULT: FPU]
Fault
Description
FPU Exception
Fault Lamp
NTO
Root Cause
This fault indicates a Floating Point Unavailable exception Interrupt Vector Register 7
(IVOR7) possibly due to an ECU hardware issue.
Troubleshooting Steps
1.
With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active? If no, go to step 3. If yes, go to step 2.
2.
Contact Lycoming Personnel to have the ECU reprogrammed. Is fault active or reprogram
unsuccessful? If no, go to step 3. If yes, replace the ECU.
3.
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.
4.
If fault repeats, replace the ECU.
