Lycoming TEO-540-C1A Maintenance Manual page 508

Fault ID 285
Primary: ACJ Temperature External
Fault
Description Secondary: ACJ Temperature External
This fault implies that the Thermocouple offset voltage is deemed INVALID.
1: The Thermocouple offset voltage may be INVALID due to a circuit fault or a slew-rate
fault on the Thermocouple offset voltage input. For details of the Thermocouple offset
voltage slew-rate and Thermocouple offset voltage circuit fault refer to Fault Ids 163
Root Cause
and 201.
2: Multiple thermocouples (CHTs, EGTs and TIT) use the Thermocouple offset voltage to
derive the corresponding temperatures so if it becomes INVALID then all the sensors
that are connected to it would set corresponding External (sensor supply) faults
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, replace the ECU.
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. If fault repeats, replace the ECU.
Fault ID 286
Fault
Description
Root Cause
Fault ID 287
Fault
Description
Root Cause
Fault ID 288
Fault
TIT Discrepancy Fault
Description
This fault indicates TIT 1 and TIT 2 differ by more than a maximum discrepancy
threshold. The fault will become inactive if TIT 1 and TIT 2 converge below the maximum
Root Cause
discrepancy.
1. Are there any active TIT slew rate, circuit or range faults? If yes, refer to troubleshooting section for the
active fault. If no, go to step 2.
2. Contact Lycoming Engines.
Appendix D
Page 478
Fault Group
Fault
Fault
Troubleshooting Steps
Fault Group
Troubleshooting Steps
Fault Group
Troubleshooting Steps
Fault Group
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
36 Fault Name
Fault Lamp
36 Fault Name
Fault Lamp
36 Fault Name
Fault Lamp
37 Fault Name
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
[FAULT: ACJ temperature external]
None
-Reserved-
None
-Reserved-
None
[FAULT: turbine inlet temperature
discrepancy]
FFL
November 2018