Lycoming TEO-540-C1A Maintenance Manual page 466

Fault ID 155
Fault Analogue engine identifier slew rate
Description fault
Root Cause This fault indicates the engine identifier slew rate is greater than the calibrated maximum.
1. Run the engine in accordance with the engine and aircraft maintenance manuals. 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 start engine. 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 156
Fault
Fuel rail pressure slew rate fault
Description
Root Cause This fault indicates the pressure sensor slew rate is greater than the calibrated maximum.
1. Run the engine in accordance with the engine and aircraft maintenance manuals. Is the fault active? *
If yes, go to step 3. If no, go to step 2.
2. Using the FST, download active and service fault logs, then clear fault logs and monitor engine
operation for the fault to repeat.
3. Inspect sensor, and lines for any damage (eg...burned, broken or frayed wires, cracked or broken
connectors or hoses, burned or broken sensors). If damage is found, replace the damaged part per the
"Sensor Replacement Procedures" section in Chapter 72-70. If no damage is found, go to step 4.
4. Inspect harness connection for any damage (eg...burned, broken or frayed wires, cracked or broken
connectors). Contact Lycoming if harness damage is found. If no damage found, go to step 5.
5. Swap fuel rail pressure sensor with fuel pump pressure sensor and run the engine. Does the fault move
with the sensor? If yes, replace the sensor. If no, go to step 6.
6. Complete a continuity test of the harness from the harness sensor connector to the ECU connector using
the engine system schematic. If the continuity check fails, isolate to affected harness by disconnecting
the firewall connection, then contact Lycoming Engines. If the continuity checks good, replace the
sensor. If fault persists, replace the ECU.
*NOTE: This fault could be caused by another fuel rail pressure fault. If there are any other active fuel rail
pressure faults go to troubleshooting steps for the corresponding fuel pressure fault.
Appendix D
Page 436
Fault Group 20
Troubleshooting Steps
Fault Group 20
Troubleshooting Steps
TEO-540-C1A Engine Maintenance Manual
[FAULT: analogue engine identifier
Fault Name
slew rate]
Fault Lamp
[FAULT: fuel rail pressure slew
Fault Name
rate]
Fault Lamp
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November 2018