Lycoming TEO-540-C1A Maintenance Manual page 499

TEO-540-C1A Engine Maintenance Manual
Fault ID 266
Primary: 5V Sensor Supply 3 Range
Fault
Description Secondary: 5V Sensor Supply 3 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*?
•
38Mhz
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 monitored
range. This does not affect system operation, but, if the frequency is not removed, can produce an
ongoing nuisance fault.
Fault ID 267
Primary: ECU Supply Voltage Range
Fault
Description Secondary: ECU Supply Voltage 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.
*NOTE: If the fault occurs prior to engine start (captured as RPM=0000 when the fault is logged.)
Check the battery voltage before proceeding to Step 1. Refer to the aircraft maintenance manual,
POH, or other aircraft manual for minimum battery voltage. If no voltage is stated, minimum
voltage is 10.5 VDC. If the battery output voltage is less than the minimum, charge the battery or
replace as necessary.
1. With Ignition switch in OFF position, remove ECU power by pulling the ECU circuit breaker. Wait 10s
before resetting. Is fault active? If no, go to step 2. If yes, replace the Power Box.
2. Clear Service faults using the FST by following the steps outlined in the "Access the Field Service
Tool" section in Appendix C or the latest revision of SSP-118.
3. If fault repeats, replace the Power Box.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group
Fault
Fault
Troubleshooting Steps
Fault Group
Fault
Fault
Troubleshooting Steps
34 Fault Name
Fault Lamp
34 Fault Name
Fault Lamp
[FAULT: 5V sensor supply 3 range]
TLO
[FAULT: ECU supply voltage
range]
TLO
Appendix D
Page 469