Lycoming TEO-540-C1A Maintenance Manual page 491

TEO-540-C1A Engine Maintenance Manual
Fault ID 248
Primary: Venturi Pressure 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 the sensor, and sensor connector. If there is damage found, replace the throttle body* per the
"(Electronic Throttle Body Replacement" procedure in Chapter 73-20. 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. 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, go to step 6.
6. Replace the throttle body. Is the fault active? If yes, replace the ECU.
7. If the above steps are unsuccessful, contact Lycoming.
*NOTE: This sensor is a sub-part of throttle body assembly hence replacing the sensor is not possible and
requires replacement of the entire throttle body assembly.
Fault ID 249
Primary: Deck Pressure Sensor Range Fault
Fault
Secondary: Deck Pressure Sensor Range
Description
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.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group
Fault
Troubleshooting Steps
Fault Group
Fault
Troubleshooting Steps
32 Fault Name
Fault Lamp
32 Fault Name
Fault Lamp
[FAULT: venturi pressure range]
TLO
[FAULT: local deck pressure
range]
TLO
Appendix D
Page 461