Lycoming TEO-540-C1A Maintenance Manual page 492

Fault ID 250
Fault Primary: CIP Sensor Range Fault
Description Secondary: CIP 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, and sensor 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 (if
equipped) 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 there is no sensor to swap with, replace the
sensor. Did the fault clear? 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 251
Fault Primary: EOP Sensor Range 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 sensor, and lines for any damage (eg...burned, broken or frayed wires, cracked or broken
connectors or hoses, burned or broken sensors). If damaged, replace the sensor per the "Sensor
Replacement Procedure" in Chapter 72-70. If no damage is found, go to step 4.
4. Inspect harness connection for any damage (eg...burned, broken or frayed wires, cracked or broken
connectors). Contact Lycoming if harness damage is found. If no damage found, replace the sensor. If
fault is still active, go to step 5.
5. 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 and fault
persists, replace the ECU.
Appendix D
Page 462
Fault Group 32
Troubleshooting Steps
Fault Group 32
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: local compressor inlet air
Fault Name
pressure range]
Fault Lamp
Fault Name
[FAULT: engine oil pressure range]
Fault Lamp
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TLO
TLO
November 2018