DOC AIRBUS | TSM A320FLoss of the Data on ARINC Bus from the EIU to the FADEC on Engine 1
TASK 77-00-00-810-886-A
Loss of the Data on ARINC Bus from the EIU to the FADEC on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 77-00-00-710-211-A ** ON A/C NOT FOR ALL
Subtask 77-00-00-810-159-C ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:37:35 UTC
Loss of the Data on ARINC Bus from the EIU to the FADEC on Engine 1
1. Possible Causes
harness J3 between the EIU (1KS1) and the ECU (4000KS) - EIU-1 [1KS1]
- CONT-AIR COND SYSTEM 1 [47HH]
- CONT-AIR COND SYSTEM 2 [57HH]
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 21-61-34-000-002 | Removal of the Air-Conditioning System Controller |
| AMM 21-61-34-400-002 | Installation of the Air-Conditioning System Controller |
| 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 732506 | |
| AMM 73-25-34-000-040 | Removal of the Engine Interface Unit (EIU) |
| AMM 73-25-34-400-040 | Installation of the Engine Interface Unit (EIU) |
| AMM 73-25-34-710-040 | Operational Test of the Engine Interface Unit |
| AMM 73-29-00-710-040 | Operational Test of the FADEC on the ground (with Engine Motoring) |
Subtask 77-00-00-710-211-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.
(2) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault Isolation(1) Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.
(2) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
Subtask 77-00-00-810-159-C ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the upper ECAM warning ENG1 BLEED STATUS FAULT and the tests of the EIU and FADEC give no maintenance messages:
- do a check for open or short to ground of the
harness J3 between the EIU (1KS1) and the ECU (4000KS) pins AB/5A, 5C to pins J3/22, 23 ASM 732506.
- repair the above wiring.
- replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- replace the CONT-AIR COND SYSTEM 1 [47HH] and CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.