EEC A and B Supplies Fault on EIU-2

TASK 73-25-00-810-A43-A
EEC A and B Supplies Fault on EIU-2

1. Possible Causes

EIU-2 [1KS2]
aircraft wiring

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
AWM 732504
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)

3. Fault Confirmation
Subtask 73-25-00-710-480-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 Isolation
Subtask 73-25-00-810-320-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Check on report for any failure of normal BUS bars (202PP) and (401PP).
(a) Troubleshoot as necessary (Ref. TSM Chap 24).
(b) Do the test given in Para. 3.
(c) If no fault regarding the BUS bars is reported or if fault continues, continue to troubleshoot at Para. 4.C.

Subtask 73-25-00-865-092-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B/AND EIU 2	4KS2	Q40

Subtask 73-25-00-810-322-A ** ON A/C NOT FOR ALL

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) Check for ground at pin 27 of connector AC on 86VU.
(3) Close both circuit breakers. Refer to the Para. 5.B.
(4) Check for 28 VDC at pins 29 and 25 of connector AC on 86VU.
(5) Open both circuit breakers. Refer to the Para. 4.B.
(6) If any damage found:
(a) Repair or replace aircraft wiring AWM 732504.
(7) If no problem is found or if fault continues:
(a) Replace EIU-2 [1KS2] AMM 73-25-34-400-802.
(b) Make sure that the both circuit breakers are closed. Refer to the Para. 5.B.
(c) Do the test given in Para. 3.

5. Close-up
Subtask 73-25-00-860-087-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 73-25-00-865-093-A ** ON A/C NOT FOR ALL

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: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B/AND EIU 2	4KS2	Q40

[Rev.8 from Aug 2018] 2026.04.04 04:36:29 UTC