Lycoming TEO-540-C1A Maintenance Manual page 437

TEO-540-C1A Engine Maintenance Manual
Fault ID 29
Fault
Application TPU exception
Description
This fault indicates a failed attempt to initialize TPU (Time Processing Unit) or an inexact
Root Cause
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.
Fault ID 30
Fault
Factory Calibration area corrupt
Description
This fault indicates a failed checksum for Unit Factory Calibration due to a corrupted boot
Root Cause
and application code OR a possible 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 31
Fault
Unsupported Interrupt occurred
Description
This fault indicates an unsupported interrupt was received possibly due to an ECU
Root Cause
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.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 4
Troubleshooting Steps
Fault Group 4
Troubleshooting Steps
Fault Group 4
Troubleshooting Steps
Fault Name
[FAULT: TPU failure]
Fault Lamp
Fault Name
[FAULT: UNITCAL ERROR]
Fault Lamp
[FAULT: UNSUPPORTED
Fault Name
INTERRUPT]
Fault Lamp
NTO
NTO
NTO
Appendix D
Page 407