Lycoming TEO-540-C1A Maintenance Manual page 434

Fault ID 20
Fault
Memory Alignment Exception
Description
This fault indicates an alignment exception Interrupt Vector Register 5 (IVOR5) from
Root Cause
processor possibly due to an ECU hardware issue.
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
Program Exception
Description
This fault indicates a program exception Interrupt Vector Register 6 (IVOR6) from
Root Cause
processor possibly due to an ECU hardware issue.
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
FPU Exception
Description
This fault indicates a Floating Point Unavailable exception Interrupt Vector Register 7
Root Cause
(IVOR7) possibly due to an ECU hardware issue.
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.
Appendix D
Page 404
Fault Group 3
Troubleshooting Steps
Fault Group 3
Troubleshooting Steps
Fault Group 3
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
Fault Name
[FAULT: ALIGNMENT]
Fault Lamp
Fault Name
[FAULT: PROGRAM]
Fault Lamp
Fault Name
[FAULT: FPU]
Fault Lamp
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NTO
NTO
NTO
November 2018