DOC AIRBUS | TSM A320FInternal Failure of the ECU on Engine 1
TASK 73-20-81-810-874-A
Internal Failure of the ECU on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-20-81-710-122-B ** ON A/C NOT FOR ALL
Subtask 73-20-81-810-122-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:39 UTC
Internal Failure of the ECU on Engine 1
1. Possible Causes
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 73-21-60-000-001 | Removal of the Electronic Control Unit (ECU) |
| AMM 73-21-60-400-001 | Installation of the Electronic Control Unit (ECU) |
| ASM 732510 | |
| AMM 73-29-00-710-040 | Operational Test of the FADEC on the ground (with Engine Motoring) |
Subtask 73-20-81-710-122-B ** ON A/C NOT FOR ALL
A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault IsolationSubtask 73-20-81-810-122-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message ECU (ARINC OUT):
- do a check for a short to ground at the wiring and connectors between the ECU (4000KS) and the test receptacle of the aircraft computers:
. EIU1 (1KS1) - DMC1 (1WT1)
. DMC2 (1WT2) - DMC3 (1WT3)
. FMGC1 (1CA1) - FWC1 (1WW1)
. FWC2 (1WW2) - DMU (1TV)
ASM 732510.
- repair the defective wiring.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.