DOC AIRBUS | TSM A320FLoss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1
TASK 73-25-00-810-891-A
Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-230-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-142-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:46 UTC
Loss of Data on the 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]
- ZONE CONTROLLER [8HK]
- ECU [4000KS]
- CONT-AIR COND SYSTEM 1 [47HH]
- CONT-AIR COND SYSTEM 2 [57HH]
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 21-63-34-000-001 | Removal of the Zone Controller |
| AMM 21-63-34-400-001 | Installation of the Zone 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 73-29-00-710-040 | Operational Test of the FADEC on the ground (with Engine Motoring) |
Subtask 73-25-00-710-230-A ** ON A/C NOT FOR ALL
A. Test
Do the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault IsolationDo the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.
Subtask 73-25-00-810-142-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message FCU, EIU (034), J3:
Subtask 73-25-00-810-142-B ** ON A/C NOT FOR ALL - 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 ZONE CONTROLLER [8HK] AMM 21-63-34-000-001 and AMM 21-63-34-400-001.
- Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. If the test gives the maintenance message FCU, EIU (034), J3:
Subtask 73-25-00-810-142-E ** ON A/C NOT FOR ALL - 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 ZONE CONTROLLER [8HK] AMM 21-63-34-000-001 and AMM 21-63-34-400-001.
- Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. If the test gives the maintenance message FCU, EIU (034), J3:
Subtask 73-25-00-710-231-A ** ON A/C NOT FOR ALL - 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.
B. Do the test given in Para. 3.A.