Lycoming TEO-540-C1A Maintenance Manual page 520

Fault ID 328
Fault
TLO lamp output failure fault
Description
Root Cause This fault indicates a lamp output failure has been consistently detected.
1. If annunciator uses an incandescent bulb, go to step 2. If annunciator uses an LED bulb, go to step 4.
2. Replace the bulb. Does fault become inactive. If yes, go to step 3. If no, go to step 4.
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. Remove connector/wires from annunciator. Complete continuity/short circuit test on annunciator
assembly, using a multi-meter and aircraft wiring manual. If annunciator is defective, replace. If
annunciator passes tests, go to step 5.
5. Complete a continuity test of the harness from the annunciator to the ECU connector using the engine
system schematic in Appendix B and aircraft wiring diagram manual. If the continuity check fails,
isolate to affected harness by disconnecting AF-P1. If engine airframe harness is at fault, contact
Lycoming Engines. If aircraft wiring is at fault, repair in accordance with aircraft maintenance manual.
If the continuity checks good, replace the annunciator. If fault persists, replace the ECU.
Fault ID 329
Fault
TLO time discrepancy fault
Description
This fault indicates TLO 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. With Ignition switch in OFF position, using the FST, reset the TLO timer by following the steps
outlined in the "Access the Field Service Tool" section in Appendix C or the latest revision of SSP-118.
2. Set ignition switch to on, do not start engine, then 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. Is fault still active? If no, sequence complete. If yes, replace the ECU.
Fault ID 330
Fault
TLO time remaining invalid fault
Description
Root Cause This fault indicates TLO time is invalid possible due to data logger or EEPROM memory
1. If equipped with a data logger, are there any active data logger faults? If no, go to step 2. If yes, go to
step 4.
2. With Ignition switch in OFF position, using the FST, reset the TLO timer by following the steps
outlined in the "Access the Field Service Tool" section in Appendix C or the latest revision of SSP-118.
Is the fault still active? If no, go to step 3. If yes, replace the ECU.
3. Set ignition switch to on, do not start engine, then 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. 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. Did data logger faults clear? If yes,
then go to step 2. If no, go to step 5.
5. Complete a continuity test of the harness from the data logger connector to the ECU connector using the
engine system schematic in Appendix B and aircraft wiring diagram manual. If the continuity check
fails, isolate to affected harness by disconnecting AF-P1. If engine airframe harness is at fault, contact
Lycoming Engines. If aircraft wiring is at fault, repair in accordance with aircraft maintenance manual.
Are there any active data logger faults? If yes, contact Lycoming Engines. If no, go to step 2.
Appendix D
Page 490
Fault Group 42
Troubleshooting Steps
Fault Group 42
Troubleshooting Steps
Fault Group 42
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
Fault Name
[FAULT: TLO lamp output failure]
Fault Lamp
[FAULT: TLO time remaining
Fault Name
discrepancy]
Fault Lamp
Fault Name
[FAULT: TLO time remaining invalid]
Fault Lamp
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November 2018