© 2018 Avco Corporation. All Rights Reserved
Appendix D
November 2018
Page 507
TEO-540-C1A Engine Maintenance Manual
Fault ID
398
Fault Group
50
Fault Name
-Reserved-
Fault
Description
Fault Lamp
NTO
Root Cause
Troubleshooting Steps
Fault ID
399
Fault Group
50
Fault Name
-Reserved-
Fault
Description
Fault Lamp
NTO
Root Cause
Troubleshooting Steps
Fault ID
400
Fault Group
51
Fault Name
[FAULT: QADC calibration failure]
Fault
Description
QADC calibration failure fault
Fault Lamp
None
Root Cause
This fault indicates a failure to write to the flash memory potentially due to flash memory
corruption.
Fault ID
401
Fault Group
51
Fault Name
[FAULT: QADC Initialization]
Fault
Description
QADC Initialization fault
Fault Lamp
None
Root Cause
This fault indicates QADC has failed to initialize properly potentially due to a hardware
failure in the QADC. The fault will become inactive if the converter successfully
initializes on subsequent attempts.
Fault ID
402
Fault Group
51
Fault Name
[FAULT: QADC scan overrun]
Fault
Description
QADC scan overrun fault
Fault Lamp
None
Root Cause
This fault indicates QADC has failed to sample the analogue channels every 1ms
potentially due to a hardware failure in the converter. The fault will become inactive if the
converter returns to normal function
Fault ID
403
Fault Group
51
Fault Name
[FAULT: Consistency QADC]
Fault
Description
QADC consistency fault
Fault Lamp
None
Root Cause
This fault indicates a memory corruption has affected the QADC
Troubleshooting Steps for Faults 400 thru 403
1.
With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active? If no, go to step 3. If yes, go to step 2.
2.
Contact Lycoming Engines to correct the calibration files and reflash the ECU. Is fault still active? If
no, go to step 3. If yes, replace the ECU.
3.
Clear Service faults using the FST by following the steps outlined in the “Access the Field Service
Tool” section in Appendix C or the latest revision of
SSP-118.
