Lycoming TEO-540-C1A Maintenance Manual page 486

Fault ID 232
Fault Primary: CHT1 External Reference Fault
Description Secondary: -reserved-
Fault ID 233
Fault Primary: CHT3 External Reference Fault
Description Secondary: -reserved-
Fault ID 234
Fault Primary: CHT5 External Reference Fault
Description Secondary: -reserved-
Fault ID 235
Fault Primary: CHT7 External Reference Fault
Description Secondary: -reserved-
Fault ID 236
Primary: -reserved-
Fault
Secondary: CHT2 External Reference
Description
Fault ID 237
Primary: -reserved-
Fault
Secondary: CHT4 External Reference
Description
Fault ID 238
Primary: -reserved-
Fault
Secondary: CHT6 External Reference
Description
Fault ID 239
Primary: -reserved-
Fault
Secondary: CHT8 External Reference
Description
Root Cause This fault occurs if there is a loss of the ACJ (Auto Cold Junction) in the ECU.
1. Is the fault active? If no, go to step 2. If yes, are there any other ACJ faults? If yes, go to
troubleshooting procedure for corresponding fault. If no, replace the ECU. Then 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.
Appendix D
Page 456
Fault Group 30
Fault Group 30
Fault Group 30
Fault Group 30
Fault Group 30
Fault
Fault Group 30
Fault
Fault Group 30
Fault
Fault Group 30
Fault
Troubleshooting Steps for Faults 232 thru 239
TEO-540-C1A Engine Maintenance Manual
[FAULT CHT 1 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 3 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 5 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 7 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 2 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 4 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 6 External Supply
Fault Name
Fault]
Fault Lamp
[FAULT CHT 8 External Supply
Fault Name
Fault]
Fault Lamp
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November 2018