Lycoming TEO-540-C1A Maintenance Manual page 485

TEO-540-C1A Engine Maintenance Manual
Fault ID 224
Fault Primary: CHT1 Sensor Range Fault
Description Secondary -reserved-
Fault ID 225
Fault Primary: CHT3 Sensor Range Fault
Description Secondary: -reserved-
Fault ID 226
Fault Primary: CHT5 Sensor Range Fault
Description Secondary: -reserved-
Fault ID 227
Fault Primary: CHT7 Sensor Range Fault
Description Secondary: -reserved-
Fault ID 228
Fault Primary: -reserved-
Description Secondary: CHT2 Sensor Range Fault
Fault ID 229
Fault Primary: -reserved-
Description Secondary: CHT4 Sensor Range Fault
Fault ID 230
Fault Primary: -reserved-
Description Secondary: CHT6 Sensor Range Fault
Fault ID 231
Fault Primary: -reserved-
Description Secondary: CHT8 Sensor Range Fault
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
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 29
Fault Group 29
Fault Group 29
Fault Group 29
Fault Group 29
Fault Group 29
Fault Group 29
Fault Group 29
Troubleshooting Steps for Faults 224 thru 231
[FAULT: cylinder head temperature
Fault Name
cyl 1 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 3 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 5 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 7 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 2 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 4 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 6 range]
Fault Lamp
[FAULT: cylinder head temperature
Fault Name
cyl 8 range]
Fault Lamp
TLO
TLO
TLO
TLO
TLO
TLO
TLO
TLO
Appendix D
Page 455