Lycoming TEO-540-C1A Maintenance Manual page 497

TEO-540-C1A Engine Maintenance Manual
Fault ID 260
Primary: ECU Temperature Sensor
Fault
Description Secondary: ECU Temperature Sensor
This fault occurs if the Engineering value of the measured parameter is outside the expected
window defined by the calibratable Highest and Lowest Valid Engineering Values.
Root Cause
The Highest and Lowest possible engineering values define the range of values that can be
expected for the entire engine operating envelope. Any value observed outside this
envelope is flagged as a sensor range fault.
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault still active or repetitive? If yes, go to step 2. If no, monitor engine operation
for the fault to repeat. If fault repeats, go to step 2.
2. Check area surrounding ECU and Power Box to ensure there is nothing that could be causing an out of
limit temperature. If something is found, correct discrepancy, then go to step 4. If nothing is found, go
to step 3.
3. If fault is still active or repetitive, but is not affecting engine operation, contact Lycoming for further
assistance. If fault affects engine operation (ie... causes other faults), replace the ECU.
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.
Fault ID 261
Primary: Power Box Temperature
Fault
Description Secondary: Power Box Temperature
This fault occurs if the Engineering value of the measured parameter is outside the expected
window defined by the calibratable Highest and Lowest Valid Engineering Values.
Root Cause
The Highest and Lowest possible engineering values define the range of values that can be
expected for the entire engine operating envelope. Any value observed outside this
envelope is flagged as a sensor range fault.
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault still active or repetitive? If yes, go to step 2. If no, monitor engine operation
for the fault to repeat. If fault repeats, go to step 2.
2. Check area surrounding ECU and Power Box to ensure there is nothing that could be causing an out of
limit temperature. If something is found, correct discrepancy, then go to step 4. If nothing is found, go
to step 3.
3. If fault is still active or repetitive, but is not affecting engine operation, contact Lycoming for further
assistance. If fault affects engine operation (ie...causes other faults), replace the Power Box, then go to
step 4.
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.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group
Range Fault
Range Fault
Troubleshooting Steps
Fault Group
Sensor Range Fault
Sensor Range Fault
Troubleshooting Steps
33 Fault Name
Fault Lamp
33 Fault Name
Fault Lamp
[FAULT: ECU temperature range]
TLO
[FAULT: APU-100 temperature
range]
TLO
Appendix D
Page 467