DOC AIRBUS | TSM A320FFailure of the EIU on Engine 2
TASK 73-25-00-810-854-A
Failure of the EIU on Engine 2
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-156-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-865-057-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:41:01 UTC
Failure of the EIU on Engine 2
1. Possible Causes
- EIU-2 [1KS2]
- aircraft wirings
- C/B-ENGINE/2/FADEC A/AND EIU 2 [2KS2]
- C/B-ENGINE/ENG2/FADEC B/AND EIU 2 [4KS2]
- 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 732505 | |
| 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 73-25-34-710-043 | Operational Test of the Engine Interface Unit |
Subtask 73-25-00-710-156-A ** ON A/C NOT FOR ALL
A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.
Subtask 73-25-00-710-156-B ** ON A/C NOT FOR ALL A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-043.
4. Fault IsolationSubtask 73-25-00-865-057-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
Subtask 73-25-00-810-103-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ENGINE/2/FADEC A/AND EIU 2 | 2KS2 | A05 |
| 121VU | ENGINE/ENG2/FADEC B/AND EIU 2 | 4KS2 | Q40 |
B. If the test gives the maintenance message EIU 2:
Subtask 73-25-00-710-157-A ** ON A/C NOT FOR ALL - do a check for 28VDC at EIU 2 (1KS2) pins AC/9, 11.
- replace the EIU-2 [1KS2] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.
- do a check for open or short to ground of the aircraft wirings between the EIU 2 (1KS2) and the circuit breakers (2KS2) and (4KS2) pins AC/9, 11.
- repair the defective wiring(s)
- replace the defective C/B-ENGINE/2/FADEC A/AND EIU 2 [2KS2] or the C/B-ENGINE/ENG2/FADEC B/AND EIU 2 [4KS2] ASM 732505.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
C. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.
Subtask 73-25-00-710-157-B ** ON A/C NOT FOR ALL C. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-043.