DOC AIRBUS | TSM A320FStart Valve Closure Fault on EIU-2
TASK 73-25-00-810-A96-A
Start Valve Closure Fault on EIU-2
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-535-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-810-397-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-149-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:48 UTC
Start Valve Closure Fault on EIU-2
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| REFERENCE | DESIGNATION |
|---|---|
| AWM 215103 | |
| 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 73-25-34-000-802 | Removal of the Engine Interface Unit (EIU) |
| AMM 73-25-34-400-802 | Installation of the Engine Interface Unit (EIU) |
| AMM 73-25-34-710-802 | Operational Test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) |
| AMM 73-25-34-860-803 | Engine Interface Unit (EIU) DISCRETE OUTPUTS Simulation |
Subtask 73-25-00-710-535-A ** ON A/C NOT FOR ALL
A. Do the operational test of the Engine Interface Unit (EIU) with the Centralized Fault Display System (CFDS) to confirm this fault AMM 73-25-34-710-802.
4. Fault IsolationSubtask 73-25-00-810-397-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
(1) Remove both air-conditioning system controllers (47HH and 57HH) AMM 21-61-34-000-002.
(2) On the MCDU, simulate the Discrete Output (DSO) 10:
(a) Push the adjacent button to DSO 10 to have the status equal to 1 AMM 73-25-34-860-803.
(b) Use a MULTIMETER - STANDARD to at both controllers rack connectors (AB), do a check for ground at contact 2A AWM 215103.
1 Stop the simulation of DSO 10 AMM 73-25-34-860-803.
(3) If there is no ground, do a check of wiring for continuity (less than 5 ohms resistance) and short to ground AWM 215103:
(a) If there is no ground at both contacts 2A, do a check of wiring between EIU-2 (1KS2) rack contact 2F and (209VT) on SHELF 95VU.
(b) If there is no ground at contact 2A of controller (47HH) rack, do a check of wiring between contact 2A of controller (47HH) rack and (209VT).
(c) If there is no ground at contact 2A of controller (57HH) rack, do a check of wiring between contact 2A and (209VT).
(d) If you find damage, repair or replace wiring AWM 215103.
(e) If you find no damage:
1 Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(4) If there is ground at contacts 2A:
(a) Replace CONT-AIR COND SYSTEM 1 [47HH] AMM 21-61-34-400-002.
2 Do the test given in Para. 3.
(5) If the fault continues:
(a) Replace CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 AMM 21-61-34-400-002.
(b) Do the test given in Para. 3.
5. Close-up(1) Remove both air-conditioning system controllers (47HH and 57HH) AMM 21-61-34-000-002.
(2) On the MCDU, simulate the Discrete Output (DSO) 10:
(a) Push the adjacent button to DSO 10 to have the status equal to 1 AMM 73-25-34-860-803.
(b) Use a MULTIMETER - STANDARD to at both controllers rack connectors (AB), do a check for ground at contact 2A AWM 215103.
1 Stop the simulation of DSO 10 AMM 73-25-34-860-803.
(3) If there is no ground, do a check of wiring for continuity (less than 5 ohms resistance) and short to ground AWM 215103:
(a) If there is no ground at both contacts 2A, do a check of wiring between EIU-2 (1KS2) rack contact 2F and (209VT) on SHELF 95VU.
(b) If there is no ground at contact 2A of controller (47HH) rack, do a check of wiring between contact 2A of controller (47HH) rack and (209VT).
(c) If there is no ground at contact 2A of controller (57HH) rack, do a check of wiring between contact 2A and (209VT).
(d) If you find damage, repair or replace wiring AWM 215103.
(e) If you find no damage:
1 Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(4) If there is ground at contacts 2A:
(a) Replace CONT-AIR COND SYSTEM 1 [47HH] AMM 21-61-34-400-002.
NOTE: Replacement of the controller (47HH) firstly then controller (57HH) secondly can be reversed.
1 Install the controller (57HH) AMM 21-61-34-400-002. 2 Do the test given in Para. 3.
(5) If the fault continues:
(a) Replace CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 AMM 21-61-34-400-002.
(b) Do the test given in Para. 3.
Subtask 73-25-00-860-149-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(1) Make sure that the work area is clean and clear of tools and other items.