Lycoming TEO-540-C1A Maintenance Manual page 498

Fault ID 262
Fault
Description
Root Cause
Fault ID 263
Fault
Description
Root Cause
Fault ID 264
Primary: 5V Sensor Supply 1 Range
Fault
Description Secondary: 5V Sensor Supply 1 Range
Fault ID 265
Primary: 5V Sensor Supply 2 Range
Fault
Description Secondary: 5V Sensor Supply 2 Range
This fault occurs if the Engineering value of the measured parameter is outside the expected
window defined by the calibratable Highest and Lowest Valid Engineering Values.
Root Cause The Highest and Lowest possible engineering values define the range of values that can be
expected for the entire engine operating envelope. Any value observed outside this
envelope is flagged as a sensor range fault.
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active or intermittent? If active, and won't clear, replace the ECU. If
intermittent, go to step 2. If not active or intermittent, monitor engine operation for the fault to repeat.
If fault repeats, go to step 2.
2. Inspect area around ECU, Power Box, ADL, and engine system cabling. Are there any RF or electrical
cables within 6" of any of these that carry the following frequency ranges*?
•
57Mhz (Supply 1)
•
59Mhz (Supply 1)
•
64Mhz (Supply 1)
•
68Mhz (Supply 1)
If yes, move cables so they are no longer within 6" of these components.
*NOTE: During RF Susceptibility testing, some frequencies in the ranges shown above were noted to cause
an intermittent range fault by altering the 5V supply voltage to 0.001 volts below its engineering
limit. This does not affect system operation, but, if the frequency is not removed, can produce an
ongoing nuisance fault.
Appendix D
Page 468
Fault Group
Troubleshooting Steps
Fault Group
Troubleshooting Steps
Fault Group
Fault
Fault
Fault Group
Fault
Fault
Troubleshooting Steps for Faults 264 and 265
•
316Mhz (Supply 2)
•
323Mhz (Supply 2)
•
338Mhz (Supply 2)
•
346Mhz (Supply 2)
TEO-540-C1A Engine Maintenance Manual
33 Fault Name
Fault Lamp
33 Fault Name
Fault Lamp
34 Fault Name
Fault Lamp
34 Fault Name
Fault Lamp
•
363Mhz (Supply 2)
•
380Mhz (Supply 1)
•
389Mhz (Supply 1)
•
398Mhz (Supply 1)
© 2018 Avco Corporation. All Rights Reserved
-Reserved-
TLO
-Reserved-
TLO
[FAULT: 5V sensor supply 1 range]
TLO
[FAULT: 5V sensor supply 2 range]
TLO
November 2018