Lycoming TEO-540-C1A Maintenance Manual page 514

Fault ID 308
Fault
Tacho time discrepancy fault
Description
This fault indicates tacho time differs between primary and secondary channel possibly
Root Cause
due to a memory corruption or one channel being down while the other was running.
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 2. If yes, go to step 3.
2. 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.
3. Set ignition switch to on, do not start engine, complete step 2. Is fault still active? If no, sequence
complete. If yes, replace the ECU.
Fault ID 309
Fault
Tacho time invalid fault
Description
This fault indicates tacho time is invalid possibly due to a data logger fault or EEPROM
Root Cause
memory corruption.
1. If equipped with a data logger, continue step 1, if not, continue to step 2. Are there any active data
logger faults? If no, go to step 2. If yes, go to step 3.
2. 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 4. If yes, go to step 5.
3. Inspect data logger and cabling for damage. If damage is noted, repair damage in accordance with
aircraft maintenance manual. If data logger is damaged, replace.
4. 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.
5. Set ignition switch to on, do not start engine, complete step 2. Is fault still active? If no, sequence
complete. If yes, replace the ECU.
Fault ID 310
Fault
EEC time discrepancy fault*
Description
This fault indicates EEC time differs between primary and secondary channel possibly due
Root Cause
to a memory corruption or one channel being down while the other was running.
1. If equipped with a data logger, continue step 1, if not, continue to step 2. Are there any active data
logger faults? If no, go to step 2. If yes, go to step 3.
2. 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 4. If yes, go to step 5.
3. Inspect data logger and cabling for damage. If damage is noted, repair damage in accordance with
aircraft maintenance manual. If data logger is damaged, replace.
4. 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.
5. Set ignition switch to on, do not start engine, complete step 4. Is fault still active? If no, sequence
complete. If yes, replace the ECU.
*NOTE: This fault does not cause any performance or operational limitations.
Appendix D
Page 484
Fault Group 39
Troubleshooting Steps
Fault Group 39
Troubleshooting Steps
Fault Group 39
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
Fault Name
[FAULT: tacho time discrepancy]
Fault Lamp
Fault Name
[FAULT: tacho time invalid]
Fault Lamp
Fault Name
[FAULT: EEC time discrepancy]
Fault Lamp
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November 2018