Lycoming TEO-540-C1A Maintenance Manual page 488

Fault ID 242
Primary: Deck Temperature Sensor
Fault
Description
Secondary: -reserved-
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. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If yes,
go to step 3. If no, go to step 2.
2. Using the FST, download active and service fault logs, then clear fault logs and monitor engine operation for
the fault to repeat.
3. Inspect the sensor, sensor lead and connector. If there is damage found, replace the sensor per the "Sensor
Replacement Procedure" in Chapter 72-70. If there is no damage, go to step 4.
4. Inspect engine harness for visible signs of damage. If damage is found, contact Lycoming Engines. If no
damage is found, go to step 5.
5. Swap the sensor from the channel giving the fault with another sensor in a different position and run the
engine. Did the fault move with the sensor? If yes, replace the sensor per the "Sensor Replacement
Procedure" in Chapter 72-70. If no, complete a continuity test of the harness from the harness sensor
connector to the ECU connector using the engine system schematic. If the continuity check fails, isolate to
affected harness by disconnecting the firewall connection, then contact Lycoming Engines. If the continuity
checks good, replace the ECU.
6. If the above steps are unsuccessful, contact Lycoming
Fault ID 243
Primary: FRT (Fuel Rail Temperature)
Fault
Description
Secondary: -reserved-
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. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If yes,
go to step 3. If no, go to step 2.
2. Using the FST, download active and service fault logs, then clear fault logs and monitor engine operation for
the fault to repeat.
3. Inspect the sensor, sensor lead and connector. If there is damage found, replace the sensor per the "Sensor
Replacement Procedure" in Chapter 72-70. If there is no damage, go to step 4.
4. Inspect engine harness for visible signs of damage. If damage is found, contact Lycoming Engines. If no
damage is found, go to step 5.
5. Swap the fuel rail temp sensor with the oil temperature sensor (A026) and run the engine. Is there now an
active oil temperature sensor range fault? If yes, replace the sensor per the "Sensor Replacement Procedure"
in Chapter 72-70. If no, complete a continuity test of the harness from the harness sensor connector to the
ECU connector using the engine system schematic. If the continuity check fails, isolate to affected harness
by disconnecting the firewall connection, then contact Lycoming Engines. If the continuity checks good,
replace the ECU.
6. If the above steps are unsuccessful, contact Lycoming
Appendix D
Page 458
Fault Group
Range Fault
Troubleshooting Steps
Fault Group
Sensor Range Fault
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
31 Fault Name
Fault Lamp
31 Fault Name
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
[FAULT: deck temperature
range]
TLO
[FAULT: fuel rail temperature
range]
TLO
November 2018