Lycoming TEO-540-C1A Maintenance Manual page 449

TEO-540-C1A Engine Maintenance Manual
Fault ID 89
Fault
Crank sensor fault
Description
This fault indicates that a crank synchronization has failed due to an incorrect number of teeth
Root Cause detection or no teeth detection. This fault also indicates an issue with the crank sensor and will
be cleared if correct teeth detection resumes
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If yes,
go to step 4. If no, go to step 2.
2. Using the FST, download active and service fault logs. Go to step 3.
3. Review logs to determine if a fault was set. If there are no active faults, but fault keeps reoccurring, then go
to step 4.
4. Inspect crank sensor harness connection for any damage (eg...burned, broken or frayed wires, cracked or
broken connectors). Contact Lycoming if harness damage is found. If no damage is found, go to step 5.
5. Swap crank sensor with cam sensor. Is the ECU now giving a cam sensor fault? If yes, replace the crank
sensor. If no, go to step 6.
6. Complete a continuity test of the harness from the harness crank sensor connector to 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 check is good, replace the ECU.
90
Fault ID
Fault
Waste Gate output driver fault
Description
This fault occurs to indicate inability to actuate the Wastegate as desired due to a circuit fault.
The circuit fault may be internal to the ECU (drive stage) or external to the ECU (load or
harness).
The fault is set under any one of the following conditions:
-
Root Cause
-
-
-
-
-
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? If yes,
go to step 2. If no, go to step 3.
2. Are there faults on both primary and secondary channels for the waste gate actuator? If yes, go to step 5. If
no, go to step 6.
3. Using the FST, download active and service fault logs. Go to step 4.
4. Review logs to determine which fault was set, and if there are more than one fault. If there are no active
faults, but fault(s) keep reoccurring, go to step 5.
5. If faults are found on both channels, inspect harness for damage (eg...burned, broken or frayed wires,
cracked or broken connectors). If damage found, contact Lycoming. If no damage found, replace the waste
gate actuator.
6. Inspect waste gate actuator harness connection for any damage (eg...burned, broken or frayed wires, cracked
or broken connectors). Contact Lycoming if harness damage is found. If no damage is found, go to step 7.
7. Complete a continuity test of the harness from the harness injector connector to ECU connector A001-P3,
and A001-P4, 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 check is good,
replace the ECU.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group
Troubleshooting Steps
Fault Group
The actuator or the drive stage is Open-circuit
The actuator is short-circuited
Low Side Drive (LSD) is shorted to the GND
High Side Drive (HSD) is shorted to the GND
LSD is shorted to the V Supply
HSD is shorted to the V Supply
Troubleshooting Steps
12 Fault Name
Fault Lamp
12
Fault Name
Fault Lamp
[FAULT: crank sensor]
NTO
[FAULT: wastegate output
failure]
NTO
Appendix D
Page 419