Lycoming TEO-540-C1A Maintenance Manual page 480

3. 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.
4. 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 196
Fault Primary/Secondary: 5V Sensor Supply
Description
This fault occurs if the Raw voltage observed on the input is outside the expected window
defined by the calibratable Highest and Lowest Valid Raw voltage values.
This does not distinguish between Open and Short Circuit Faults as any of the following
Root Cause
failures would result in the Raw voltage outside the expected voltage window:
-
-
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, replace the ECU.
Fault ID 197
Fault Primary/Secondary: 5V Sensor Supply
Description
This fault occurs if the Raw voltage observed on the input is outside the expected window
defined by the calibratable Highest and Lowest Valid Raw voltage values.
This does not distinguish between Open and Short Circuit Faults as any of the following
Root Cause
failures would result in the Raw voltage outside the expected voltage window:
-
-
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, replace the ECU.
Fault ID 198
Fault Primary/Secondary: 5V Sensor Supply
Description
This fault occurs if the Raw voltage observed on the input is outside the expected window
defined by the calibratable Highest and Lowest Valid Raw voltage values.
This does not distinguish between Open and Short Circuit Faults as any of the following
Root Cause
failures would result in the Raw voltage outside the expected voltage window:
-
-
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, replace the ECU.
Appendix D
Page 450
Troubleshooting Steps for Fault 195 (Cont.)
Fault Group
1 Circuit Fault
-
Open Circuit
-
Short to 5V
Troubleshooting Steps
Fault Group
2 Circuit Fault
-
Open Circuit
-
Short to 5V
Troubleshooting Steps
Fault Group
3 Circuit Fault
-
Open Circuit
-
Short to 5V
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
25 Fault Name
Fault Lamp
Short to VPwr
Short to GND
25 Fault Name
Fault Lamp
Short to VPwr
Short to GND
25 Fault Name
Fault Lamp
Short to VPwr
Short to GND
© 2018 Avco Corporation. All Rights Reserved
[FAULT: AN31 circuit]
TLO
[FAULT: AN32 circuit]
TLO
[FAULT: AN33 circuit]
TLO
November 2018