Lycoming TEO-540-C1A Maintenance Manual page 445

TEO-540-C1A Engine Maintenance Manual
2. Inspect spark plugs and leads per the "Ignition Lead Inspection" and "Spark Plug Inspection" sections in
Chapter 74-20 and replace any spark plug or cable that does not meet serviceability requirements. If all
plugs and leads pass inspection, swap spark plug of affected ignition circuit with a spark plug from
another cylinder. Does the fault move with the spark plug? If yes, replace the spark plug. If no, swap
the cable of the affected ignition circuit with another cable with similar length so both can be
reconnected. Does the fault move with the cable? If yes, replace the cable. If no, go to step 3.
3. Remove the coil box cover, swap the coil of the affected ignition circuit with a coil from another
cylinder. Does the fault follow the coil? If yes, replace the coil. If no, go to step 8.
4. Using the FST, download active and service fault logs.
5. 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, then if one fault, go to step 2. If multiple faults, go to step 5.
6. If multiple cylinders were found to be malfunctioning in step 1, are they malfunctioning in groups as
shown below?
Group 1 (Pri)
1T
3T
5T
7. If yes, remove the coil box cover, disconnect all applicable harness coil connectors (Group 1, 2, 3, or 4),
apply power to the aircraft, turn on the ignition and check for 14VDC on pin A of each coil connector.
Is 14 VDC present on one or all malfunctioning coils? If 14 VDC is present on at least one, but not
three, complete a continuity test of the harness from each of the harness coil connectors to the ECU and
Power Box connectors 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 checks good, or if 14 VDC is not present, replace the Power Box.
8. Complete a continuity test of the harness from the harness coil connector to the ECU and Power Box
connectors 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.
*NOTE: When performing the continuity check, ensure all coils for the group are disconnected to prevent
false continuity by reading through another coil.
Fault ID 72
Fault
Cylinder 1 injection output failure
Description
Fault ID 73
Fault
Cylinder 2 injection output failure
Description
Fault ID 74
Fault
Cylinder 3 injection output failure
Description
Fault ID 75
Fault
Cylinder 4 injection output failure
Description
© 2018 Avco Corporation. All Rights Reserved
November 2018
Troubleshooting Steps for Faults 64 thru 71 (Cont.)
Group 2 (Sec) Group 3 (Sec)
2T 1B
4T 3B
6T 5B
Fault Group
Fault Group
Fault Group
Fault Group
Group 4 (Pri)
2B
4B
6B
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
10 Fault Name
Fault Lamp
[FAULT: Cylinder 1 injection output
failure]
NTO
[FAULT: Cylinder 2 injection output
failure]
NTO
[FAULT: Cylinder 3 injection output
failure]
NTO
[FAULT: Cylinder 4 injection output
failure]
NTO
Appendix D
Page 415