Lycoming TEO-540-C1A Maintenance Manual page 505

TEO-540-C1A Engine Maintenance Manual
Fault ID 280
Primary: -reserved-
Fault
Secondary: Engine ID External (Sensor
Description
This fault implies that the 5V sensor supply that is connected to the sensor is deemed
INVALID.
1: The 5V supply may be INVALID due to a circuit fault or a slew-rate fault on the 5V
supply. For details of the 5V Supply faults refer to Fault Ids 160-162, 196-198 and 264-
Root Cause 266.
2: Multiple sensors may be connected to the same 5V supply so if it becomes INVALID
then all the sensors that are connected to it would set corresponding External (sensor
supply) faults. Refer to the system schematic to identify the sensors that may be
connected to a 5V supply.
1. Is the fault active? If yes, go to step 2. If no, go to step 4.
2. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault still active? If yes, go to step 3. If no, monitor engine operation for the fault to
repeat.
3. Remove harness connector A001-P2 from ECU connector A001-J2. Using a multi-meter, check for
continuity (or a specific resistance if a resistor is installed) between pins 33 and 42 of A001-P2. Does
continuity (or correct resistance) exist? If yes, reconnect A001-J2, and go to step 4. If no, contact
Lycoming Engines.
4. Clear Service fault history and turn ignition switch on. If the fault is still active replace the ECU.
NOTE: By default, this configurable parameter has been disabled hence this fault should only occur if this is
enabled in the calibration for an engine specific installation.
Fault ID 281
Primary: -reserved-
Fault Secondary: Operating Mode Selector
Description
This fault implies that the 5V sensor supply that is connected to the sensor is deemed
INVALID.
1: The 5V supply may be INVALID due to a circuit fault or a slew-rate fault on the 5V
supply. For details of the 5V Supply faults refer to Fault Ids 160-162, 196-198 and 264-
Root Cause 266.
2: Multiple sensors may be connected to the same 5V supply so if it becomes INVALID
then all the sensors that are connected to it would set corresponding External (sensor
supply) faults. Refer to the system schematic to identify the sensors that may be
connected to a 5V supply.
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.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 36
Supply Fault)
Troubleshooting Steps
Fault Group 36
External (Sensor Supply
Fault)
Troubleshooting Steps
[FAULT: analogue engine identifier
Fault Name
external]
Fault Lamp
[FAULT: analogue pilot operating
Fault Name
mode external]
Fault Lamp
None
None
Appendix D
Page 475