Lycoming TEO-540-C1A Maintenance Manual page 473

TEO-540-C1A Engine Maintenance Manual
Fault ID 176
Fault Primary CHT Cylinder 1 Circuit Fault
Description Secondary CHT Cylinder 2 Circuit Fault
Fault ID 177
Fault Primary CHT Cylinder 3 Circuit Fault
Description Secondary CHT Cylinder 4 Circuit Fault
Fault ID 178
Fault Primary CHT Cylinder 5 Circuit Fault
Description Secondary CHT Cylinder 6 Circuit Fault
Fault ID 179
Fault Primary CHT Cylinder 7 Circuit Fault
Description Secondary CHT Cylinder 8 Circuit Fault
Fault ID 180
Fault Primary EGT Cylinder 2 Circuit Fault
Description Secondary EGT Cylinder 1 Circuit Fault
Fault ID 181
Fault Primary EGT Cylinder 4 Circuit Fault
Description Secondary EGT Cylinder 3 Circuit Fault
Fault ID 182
Fault Primary EGT Cylinder 6 Circuit Fault
Description Secondary EGT Cylinder 5 Circuit Fault
Fault ID 183
Fault Primary EGT Cylinder 8 Circuit Fault
Description Secondary EGT Cylinder 7 Circuit Fault
This fault occurs if the Raw voltage observed on the input is outside the expected window
defined by the calibratable Highest and Lowest Valid Raw voltage values.
This does not distinguish between Open and Short Circuit Faults as any of the following
Root Cause
failures would result in the Raw voltage outside the expected voltage window:
-
-
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 connector and lead. If any are damaged, 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 cylinder, 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.
*NOTE: The steps listed above are for troubleshooting a single fault event. If there are faults on multiple
thermocouples, check to see if there are any active faults for ECU ACJ offset or internal power
supply. If there are any other active faults, as those just mentioned, proceed to the troubleshooting
of those faults.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group
Fault Group
Fault Group
Fault Group
Fault Group
Fault Group
Fault Group
Fault Group
Open Circuit
Short to GND
Troubleshooting Steps
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
23 Fault Name
Fault Lamp
[FAULT: AN2 circuit]
FFL
[FAULT: AN3 circuit]
FFL
[FAULT: AN4 circuit]
FFL
[FAULT: AN5 circuit]
FFL
[FAULT: AN6 circuit]
FFL
[FAULT: AN7 circuit]
FFL
[FAULT: AN8 circuit]
FFL
[FAULT: AN9 circuit]
FFL
Appendix D
Page 443