DOC AIRBUS | TSM A320FIgnitors A and B Supplies Fault on EIU-2
TASK 73-25-00-810-A45-A
Ignitors A and B Supplies Fault on EIU-2
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-482-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-089-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:29 UTC
Ignitors A and B Supplies Fault on EIU-2
1. Possible Causes
- EIU-2 [1KS2]
- aircraft wiring
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| 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) |
| AWM 743101 | |
| AWM 743102 |
Subtask 73-25-00-710-482-A ** ON A/C NOT FOR ALL
A. Do the test as follows:
(1) Make sure the ENG/MASTER control switch (2KC) is in the OFF position.
(2) 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.
(3) If the fault is confirmed go to the Para. 4.
(4) If the fault is not confirmed, put the ENG/MASTER control switch (2KC) in the ON position.
(5) Do again the operational test of the EIU with the CFDS to confirm this fault AMM 73-25-34-710-802.
4. Fault Isolation(1) Make sure the ENG/MASTER control switch (2KC) is in the OFF position.
(2) 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.
(3) If the fault is confirmed go to the Para. 4.
(4) If the fault is not confirmed, put the ENG/MASTER control switch (2KC) in the ON position.
(5) Do again the operational test of the EIU with the CFDS to confirm this fault AMM 73-25-34-710-802.
WARNING:
MAKE SURE THAT THE CIRCUIT BREAKERS ARE OPEN BEFORE YOU DO MAINTENANCE WORK ON THIS SYSTEM WIRING. THE VOLTAGE ON THIS SYSTEM IS DANGEROUSLY HIGH AND CAN CAUSE SEVERE INJURY.
Subtask 73-25-00-810-325-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3. with the ENG/MASTER Control Switch (2KC) in the position that confirmed the fault.
(3) If the fault continues:
(a) Troubleshoot as follows:
(4) Check on report for any failure of BUS bars (204XP) and (401XP).
(a) Troubleshoot as necessary (Ref. TSM Chap. 24).
(b) Do the test given in the Para. 3. with the ENG/MASTER control switch (2KC) in the position that confirmed the fault.
(c) If no fault regarding the BUS bar is reported or if fault continues, go to the Para. 4.C.
Subtask 73-25-00-865-096-A ** ON A/C NOT FOR ALL (1) Replace EIU-2 [1KS2] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3. with the ENG/MASTER Control Switch (2KC) in the position that confirmed the fault.
(3) If the fault continues:
(a) Troubleshoot as follows:
(4) Check on report for any failure of BUS bars (204XP) and (401XP).
(a) Troubleshoot as necessary (Ref. TSM Chap. 24).
(b) Do the test given in the Para. 3. with the ENG/MASTER control switch (2KC) in the position that confirmed the fault.
(c) If no fault regarding the BUS bar is reported or if fault continues, go to the Para. 4.C.
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 73-25-00-810-326-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 49VU | ENGINE/1 AND 2/IGN/SYS A | 1JH | A03 |
| 121VU | ENGINE/IGN/ENG2/SYS B | 3JH2 | P42 |
C. If no fault regarding the BUS bar is reported or if fault continues:
(1) Remove EIU-2 [1KS2] AMM 73-25-34-000-802.
(2) Use a MULTIMETER - STANDARD to test the 115 VAC supply circuits AWM 743101 and AWM 743102. Refer to Table 1 and Table 2. Look for:
(a) Wire-to-wire shorts
(b) Shorts to ground
(c) Continuity (less than 5 ohms resistance).
Table 2: Ignitor System B Circuit Connector Contacts
(3) If a problem is found:
(a) Repair or replace aircraft wiring AWM 743101 and AWM 743102.
(4) If no problem is found or if fault continues:
(a) Replace EIU-2 [1KS2] AMM 73-25-34-400-802.
(b) Go to the Para. 5.B.
(c) Do the test given in the Para. 3. with the ENG/MASTER control switch (2KC) in the OFF position.
5. Close-up(1) Remove EIU-2 [1KS2] AMM 73-25-34-000-802.
(2) Use a MULTIMETER - STANDARD to test the 115 VAC supply circuits AWM 743101 and AWM 743102. Refer to Table 1 and Table 2. Look for:
(a) Wire-to-wire shorts
(b) Shorts to ground
(c) Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 1: Ignitor System A Circuit Connector Contacts | C/B (1JH) Contacts | EIU-2 (1KS2) Connector AC Contacts |
|---|---|
| 2 | 4 |
Table 2: Ignitor System B Circuit Connector Contacts
| C/B (3JH2) Contacts | EIU-2 (1KS2) Connector AC Contacts |
|---|---|
| 2 | 13 |
(a) Repair or replace aircraft wiring AWM 743101 and AWM 743102.
(4) If no problem is found or if fault continues:
(a) Replace EIU-2 [1KS2] AMM 73-25-34-400-802.
(b) Go to the Para. 5.B.
(c) Do the test given in the Para. 3. with the ENG/MASTER control switch (2KC) in the OFF position.
Subtask 73-25-00-860-089-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.
Subtask 73-25-00-865-097-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 73-25-00-860-402-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 49VU | ENGINE/1 AND 2/IGN/SYS A | 1JH | A03 |
| 121VU | ENGINE/IGN/ENG2/SYS B | 3JH2 | P42 |
C. Put the aircraft back to its initial configuration.
(1) Make sure the ENG/MASTER control switch (2KC) is in the OFF position.
(1) Make sure the ENG/MASTER control switch (2KC) is in the OFF position.