Lycoming TEO-540-C1A Maintenance Manual page 436

Fault ID 26
Fault RPRA area invalid during exception
Description processing
This fault indicates an exception or interrupt occurred before the RPRA was tested and
Root Cause initialized. This should prompt the boot code to initialize the RPRA. The fault was
triggered 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 27
Fault
RPRA area is not coherent
Description
This fault indicates the RPRA contains an invalid data possibly due to an ECU hardware
Root Cause
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 28
Fault
SPE Exception
Description
This fault indicates a SPE (Signal Processing Engine) Floating Point data exception or
Root Cause
inexact result from floating-point instruction 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 406
Fault Group 4
Troubleshooting Steps
Fault Group 4
Troubleshooting Steps
Fault Group 4
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: RPRA INVALID
Fault Name
EXCEPTION]
Fault Lamp
Fault Name
[FAULT: RPRA INVALID]
Fault Lamp
Fault Name
[FAULT: SPE]
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
NTO
NTO
NTO
November 2018