DOC AIRBUS | TSM A320FEIU-1 Fault to Supply Ignition A and B
TASK 73-25-00-810-A28-A
EIU-1 Fault to Supply Ignition A and B
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-25-00-710-465-A ** ON A/C NOT FOR ALL
Subtask 73-25-00-860-072-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:28 UTC
EIU-1 Fault to Supply Ignition A and B
1. Possible Causes
- EIU-1 [1KS1]
- HARNESS-FAN, WF02 [4218KS]
- W04 HARNESS [4088KS]
- HARNESS-FAN, WF01 [4217KS]
- W03 HARNESS [4087KS]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | PLIERS - JAWED, SOFT |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| AMM 71-13-00-010-802 | Opening of the Fan Cowl Doors |
| AMM 71-13-00-410-802 | Closing of the Fan Cowl Doors |
| AMM 73-21-61-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (WF01) |
| AMM 73-21-61-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (WF01) |
| AMM 73-21-62-000-802 | Removal of the EEC Wiring Harness (WF02) |
| AMM 73-21-62-400-802 | Installation of the EEC Wiring Harness (WF02) |
| AMM 73-21-63-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| AMM 73-21-63-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| AMM 73-21-64-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-64-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| 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 |
Subtask 73-25-00-710-465-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 IsolationWARNING:
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 73-25-00-810-299-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3.
(3) If the fault continues, troubleshoot as follows:
Subtask 73-25-00-865-078-A ** ON A/C NOT FOR ALL (1) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.
(2) Do the test given in Para. 3.
(3) If the fault continues, troubleshoot as follows:
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 73-25-00-810-300-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1 AND 2/IGN/SYS A | 1JH | A03 |
| 121VU | ENGINE/IGN/ENG1/SYS B | 3JH1 | P41 |
C. Check for harness fault:
(1) Open the fan cowl doors of Engine 1 AMM 71-13-00-010-802.
(2) Use a PLIERS - JAWED, SOFT to disconnect connectors (P402) and (P403) and check for tension at pin 31 of both connectors (402VC1) and (403VC1).
(3) If there is tension at pin 31 of connector (402VC1):
(a) Repair or replace aircraft wiring AWM 743101.
(4) If there is no tension:
(a) Disconnect connector (P102) and check for tension at pin 1 connector (J102).
1 If there is tension:
a Replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
2 If there is no tension:
a Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
(5) If there is tension at pin 31 of connector (403VC1):
(a) Repair or replace aircraft wiring AWM 743101.
(6) If there is no tension:
(a) Disconnect connector (P101) and check for tension at pin 1 connector (J101).
1 If there is tension:
a Replace HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
2 If there is no tension:
a Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
(7) If necessary, connect connectors (P402), (P403), (P101) and (P102).
(8) Close the circuit breakers. Refer to the Para. 5.B.
(9) Do the test given in Para. 3.
5. Close-up(1) Open the fan cowl doors of Engine 1 AMM 71-13-00-010-802.
(2) Use a PLIERS - JAWED, SOFT to disconnect connectors (P402) and (P403) and check for tension at pin 31 of both connectors (402VC1) and (403VC1).
(3) If there is tension at pin 31 of connector (402VC1):
(a) Repair or replace aircraft wiring AWM 743101.
(4) If there is no tension:
(a) Disconnect connector (P102) and check for tension at pin 1 connector (J102).
1 If there is tension:
a Replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
2 If there is no tension:
a Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
(5) If there is tension at pin 31 of connector (403VC1):
(a) Repair or replace aircraft wiring AWM 743101.
(6) If there is no tension:
(a) Disconnect connector (P101) and check for tension at pin 1 connector (J101).
1 If there is tension:
a Replace HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
2 If there is no tension:
a Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
(7) If necessary, connect connectors (P402), (P403), (P101) and (P102).
(8) Close the circuit breakers. Refer to the Para. 5.B.
(9) Do the test given in Para. 3.
Subtask 73-25-00-860-072-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.
(2) Close the fan cowl doors AMM 71-13-00-410-802.
Subtask 73-25-00-865-079-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors AMM 71-13-00-410-802.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1 AND 2/IGN/SYS A | 1JH | A03 |
| 121VU | ENGINE/IGN/ENG1/SYS B | 3JH1 | P41 |