Lycoming TEO-540-C1A Maintenance Manual page 468

Fault ID 159
Primary: -reserved-
Fault
Secondary: Operating Mode Selector
Description
Root Cause This fault indicates pilot operating mode slew rate is greater than the calibrated maximum
1. Is there an active fault(s) that correspond to the fault numbers listed in the Root Cause box, items 1 and
2? If yes, go to troubleshooting procedure for the active fault(s). If no, go to step 2.
2. Inspect wires and resistors connected to switch for breaks or damage. Are wires or resistors broken or
damaged? If yes, repair in accordance with the aircraft maintenance manual. If no, go to step 3.
3. Disconnect wires from switch and disconnect ECU connector A001-P2. Measure resistance from A001-
P2 pin 48 to each wire and check for resistance as shown in the table below. Are the resistances
measured within the table limits? If yes, go to step 4. If no, but resistance is present and not within
table limits, replace the defective resistor in accordance with the aircraft maintenance manual. If no, and
circuit is open, go to step 5.
Switch Position
C
NORM
S
4. Complete a continuity and short circuit test of the switch. If the continuity or short circuit check fails,
replace the switch. If the continuity check is good, replace the ECU.
5. Complete a continuity test of the harness from the input side of each resistor 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 160
Fault
5V sensor supply 1 slew rate fault
Description
Root Cause This fault indicates 5V sensor supply 1 slew rate is greater than the calibrated maximum
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault still active or repetitive? If yes, go to step 2. If no, monitor engine operation
for the fault to repeat. If fault repeats, go to step 2.
2. If fault is still active or repetitive, but is not affecting engine operation, contact Lycoming for further
assistance. If fault affects engine operation (ie... causes other faults), replace the ECU.
Fault ID 161
Fault
5V sensor supply 2 slew rate fault
Description
Root Cause This fault indicates 5V sensor supply 2 slew rate is greater than the calibrated maximum
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault still active or repetitive? If yes, go to step 2. If no, monitor engine operation
for the fault to repeat. If fault repeats, go to step 2.
2. If fault is still active or repetitive, but is not affecting engine operation, contact Lycoming for further
assistance. If fault affects engine operation (ie... causes other faults), replace the ECU.
Appendix D
Page 438
Fault Group 20
Slew Rate Fault
Troubleshooting Steps
Resistance Tolerance
330kΩ
±10%
1.01MΩ
±10%
3.21MΩ
±10%
Fault Group 21
Troubleshooting Steps
Fault Group 21
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: analogue pilot operating
Fault Name
mode slew rate]
Fault Lamp
[FAULT: 5V sensor supply 1 slew
Fault Name
rate]
Fault Lamp
[FAULT: 5V sensor supply 2 slew
Fault Name
rate]
Fault Lamp
© 2018 Avco Corporation. All Rights Reserved
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November 2018