Lycoming TEO-540-C1A Maintenance Manual page 527

TEO-540-C1A Engine Maintenance Manual
Fault ID 352
Fault
Local Ignition Switch Noise Fault
Description
This fault indicates the local ignition switch is noisy. The fault will become inactive if the
Root Cause
noise is reduced.
1. Inspect wires connected to switch for breaks or damage. Are wires broken or damaged? If yes, repair in
accordance with the aircraft maintenance manual. If no, go to step 2.
2. Complete a continuity and short circuit test of the switch. If the continuity or short circuit check fails,
replace the switch. If the continuity and short circuit test check is good, go to step 3.
3. Complete a continuity test of the harness from the switch connections to the ECU connector using the
engine system schematic. If the continuity check fails, isolate to affected harness by disconnecting the
airframe interface connection AF-P1. If the continuity fails between switch and AF-J1, repair cable in
accordance with aircraft maintenance manual. If the continuity fails between AF-P1 and ECU, contact
Lycoming Engines. If the continuity checks good, replace the ECU.
Fault ID 353
Fault Local Ignition Switch Discrepancy
Description Fault
This fault indicates the ignition switch differs between primary and secondary channels
Root Cause
possibly due to a hardware issue
1. Is the fault active, or are there any active or logged ignition switch slew rate or circuit faults?
If yes, go to step 2.
2. Inspect wires connected to switch for breaks or damage. Are wires broken or damaged? If yes, repair in
accordance with the aircraft maintenance manual. If no, go to step 2.
3. Complete a continuity and short circuit test of the switch. If the continuity or short circuit check fails,
replace the switch. If the continuity and short circuit test check is good, go to step 4.
4. Complete a continuity test of the harness from the switch connections to the ECU connector using the
engine system schematic. If the continuity check fails, isolate to affected harness by disconnecting the
airframe interface connection AF-P1. If the continuity fails between switch and AF-J1, repair cable in
accordance with aircraft maintenance manual. If the continuity fails between AF-P1 and ECU, contact
Lycoming Engines. If the continuity checks good, replace the ECU.
Fault ID 354
Fault
Description
Root Cause
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 45
Troubleshooting Steps
Fault Group 45
Troubleshooting Steps
Fault Group 45
Troubleshooting Steps
Fault Name
[FAULT: local ignition switch noise]
Fault Lamp
[FAULT: ignition switch
Fault Name
discrepancy]
Fault Lamp
Fault Name
-Reserved-
Fault Lamp
FFL
FFL
FFL
Appendix D
Page 497