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Appendix D
November 2018
Page 467
TEO-540-C1A Engine Maintenance Manual
Fault ID
260
Fault Group
33
Fault Name
[FAULT: ECU temperature range]
Fault
Description
Primary: ECU Temperature Sensor
Range Fault
Secondary: ECU Temperature Sensor
Range Fault
Fault Lamp
TLO
Root Cause
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.
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.
Troubleshooting Steps
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
Fault Group
33
Fault Name
[FAULT: APU-100 temperature
range]
Fault
Description
Primary: Power Box Temperature
Sensor Range Fault
Secondary: Power Box Temperature
Sensor Range Fault
Fault Lamp
TLO
Root Cause
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.
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.
Troubleshooting Steps
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.