Lycoming TEO-540-C1A Maintenance Manual page 441

TEO-540-C1A Engine Maintenance Manual
4. Inspect CHT and EGT sensors, and leads for any damage (eg...burned, broken or frayed wires, cracked
or broken connectors, burned or broken sensors). Replace any damaged sensors in accordance with the
engine maintenance manual.
5. Inspect CHT and EGT harness connections for any damage (eg...burned, broken or frayed wires,
cracked or broken connectors). Contact Lycoming if harness damage is found.
6. Swap the sensor from the channel giving the fault with another sensor on a different cylinder. Does the
fault move with the sensor? If so, replace the sensor in accordance with the engine maintenance manual.
If the fault does not move, perform a continuity test of the harness from the harness sensor connector to
the ECU connector using the engine system schematic. If continuity check fails, isolate to affected
harness by disconnecting the firewall connection, then contact Lycoming Engines. If continuity checks
good, go to next step.
7. Inspect spark plugs and leads in accordance with the maintenance manual and clean or replace as
needed.
8. If spark plug and leads check good, remove cover from coil box, remove connector from coil of affected
cylinder, and check for 14 VDC on pin A of the harness coil connector (with power applied to EEC
system). If 14 VDC is present, swap coil with another cylinder. Does fault move with coil? If so,
replace coil in accordance with engine maintenance manual. If 14 VDC is not present, or the fault does
not move with the coil, perform a continuity test of the harness from the harness coil connector to the
ECU and APU connectors using the engine system schematic. If continuity check fails, isolate to
affected harness by disconnecting the firewall connection, then contact Lycoming Engines. If continuity
check passes, but 14 VDC is not present, contact Lycoming Engines for replacement of the APU. If all
checks pass, go to next step.
9. Swap fuel injector of the affected cylinder with another cylinder. Run the engine. Does the fault move
with the injector? If so, replace the injector. If the fault does not move, perform a continuity test of the
harness from the harness injector connector to the ECU using the engine system schematic. If continuity
check fails, isolate to affected harness by disconnecting the firewall connection, then contact Lycoming
Engines. If continuity check passes, go to step 7.
10. If all above steps check good, perform a compression check in accordance with the maintenance manual.
11. If all steps pass, contact Lycoming Engines.
Fault ID 48
Fault Cylinder 1 excessive detonation
Description detected
Fault ID 49
Fault Cylinder 2 excessive detonation
Description detected
Fault ID 50
Fault Cylinder 3 excessive detonation
Description detected
Fault ID 51
Fault Cylinder 4 excessive detonation
Description detected
Fault ID 52
Fault Cylinder 5 excessive detonation
Description detected
© 2018 Avco Corporation. All Rights Reserved
November 2018
Troubleshooting Steps for Faults 40 thru 47 (Cont.)
Fault Group
Fault Group
Fault Group
Fault Group
Fault Group
7 Fault Name
Fault Lamp
7 Fault Name
Fault Lamp
7 Fault Name
Fault Lamp
7 Fault Name
Fault Lamp
7 Fault Name
Fault Lamp
[FAULT: Cylinder 1 detonation
detected]
NTO
[FAULT: Cylinder 2 detonation
detected]
NTO
[FAULT: Cylinder 3 detonation
detected]
NTO
[FAULT: Cylinder 4 detonation
detected]
NTO
[FAULT: Cylinder 5 detonation
detected]
NTO
Appendix D
Page 411