Lycoming TEO-540-C1A Maintenance Manual page 467

TEO-540-C1A Engine Maintenance Manual
Fault ID 157
Fault
Fuel pump 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 pump pressure sensor with fuel rail 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 pump pressure fault. If there are any other active fuel
pump pressure faults go to troubleshooting steps for the corresponding fuel pressure fault.
Fault ID 158
Fault
Local throttle position slew rate fault
Description
This fault indicates the throttle position sensor slew rate is greater than the calibrated
Root Cause
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 throttle position sensor and throttle body for damage. If damage is found, replace the damaged
part** per the "Sensor Replacement Procedures" section in Chapter 72-70 or the "(Electronic) Throttle
Body Replacement" section in Chapter 73-20. 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. 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, throttle body**.
If fault persists, replace the ECU.
*NOTE: This fault could be caused by another throttle position fault. If there are any other active throttle
position faults, go to troubleshooting steps for the corresponding oil pressure fault.
**NOTE: The throttle position sensor is part of throttle body assembly and required replacing the entire
throttle body if damaged or defective.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Fault Group 20
Troubleshooting Steps
Fault Group 20
Troubleshooting Steps
[FAULT: fuel pump pressure slew
Fault Name
rate]
Fault Lamp
[FAULT: local throttle position slew
Fault Name
rate]
Fault Lamp
None
None
Appendix D
Page 437