Lycoming TEO-540-C1A Maintenance Manual page 542

Fault ID 418
Fault Engine speed discrepancy fault
Description
This fault indicates the average engine speed between primary and secondary channels
Root Cause
differ by more than a maximum threshold
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 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.
Fault ID 419
Fault
Description
Root Cause
Fault ID 420
Fault
Description
Root Cause
Fault ID 421
Fault
Description
Root Cause
Fault ID 422
Fault
Description
Root Cause
Appendix D
Page 512
Fault Group 53
Troubleshooting Steps
Fault Group 53
Troubleshooting Steps
Fault Group 53
Troubleshooting Steps
Fault Group 53
Troubleshooting Steps
Fault Group 53
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: engine speed discrepancy]
Fault Name
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
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November 2018