Lycoming TEO-540-C1A Maintenance Manual page 452

Fault ID 98
Fault
Take off reserve time discrepancy fault
Description
This fault indicates the primary and secondary channel's take off reserve time differ by
Root Cause more than the calibrated maximum discrepancy possibly due to one channel down while
the other channel was operational.
NOTE: The ECU has to be hard reset at the facility for the fault to be inactive or the discrepancy limit needs
to be below the maximum calibrated limit. This fault doesn't cause any operational or performance
risks hence is considered very low risk.
Fault ID 99
Fault
Take off reserve time invalid fault
Description
This fault indicates the primary and secondary channel's take off reserve time is invalid
Root Cause
possibly due to a NVM (Non-Volatile Memory) issue
NOTE: The ECU has to be hard reset at the facility for the fault to be inactive. This fault doesn't cause any
operational or performance risks hence is considered very low risk.
Fault ID 100
Fault Take off reserve switch discrepancy
Description fault
This fault indicates the primary and secondary channel's take off reserve switch position
Root Cause differ possibility due to a switch hardware issue. The fault will become inactive if one of
both switch change position and agree with each other.
1. Disconnect wires from switch. Does fault go inactive? If yes, replace the switch. If no, go to step 2.
2. Complete a continuity and short circuit test of the harness from the switch connector(s) to ECU
connectors using the engine system schematic. If the continuity or short circuit check fails, isolate to
affected harness by disconnecting the airframe interface connection AF-P1. If problem is isolated to
engine airframe harness, contact Lycoming Engines. If problem is found from switch to AF-J1, repair in
accordance with aircraft maintenance manual. If the continuity check is good, replace the ECU.
Fault ID 101
Fault
Digital Channel ID discrepancy fault
Description
This fault indicates the primary and secondary channel ID are identical OR channel ID is
Root Cause invalid on at least one of the two channels possibly due to memory corruption or GPIO
(General Purpose Input Output) issue
1. Contact Lycoming Personnel to have the ECU reprogrammed with appropriate boot and application
code to ensure the fault has become inactive*
2. If step 1 is unsuccessful, contact Lycoming to have ECU replaced.
Appendix D
Page 422
Fault Group 13
Troubleshooting Steps
Fault Group 13
Troubleshooting Steps
Fault Group 13
Troubleshooting Steps
Fault Group 13
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: takeoff reserve time
Fault Name
discrepancy]
Fault Lamp
[FAULT: takeoff reserve time
Fault Name
invalid]
Fault Lamp
[FAULT: takeoff reserve switch
Fault Name
discrepancy]
Fault Lamp
[FAULT: digital channel ID
Fault Name
discrepancy]
Fault Lamp
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November 2018