EEC B Supply Fault on EIU-2

TASK 73-25-00-810-B10-A
EEC B Supply Fault on EIU-2

1. Possible Causes

wiring
EIU-2 [1KS2]

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

REFERENCE	QTY	DESIGNATION
No specific	1	MULTIMETER - STANDARD
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 73-25-00-710-549-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 73-25-00-810-420-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).
(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. C.

Subtask 73-25-00-865-147-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)
121VU	ENGINE/ENG2/FADEC B/AND EIU 2	4KS2	Q40

Subtask 73-25-00-810-421-A ** ON A/C NOT FOR ALL

C. If no fault regarding the BUS bar is reported or if fault continues:
(1) Remove the EIU-2 (1KS2) AMM 73-25-34-000-802.
(2) Use a MULTIMETER - STANDARD do a check for ground at pin 27 of connector AC on the SHELF panel 86VU.
(3) Close the circuit breakers. Refer to the Para. 4.D.
(4) Use a MULTIMETER - STANDARD do a check for 28 VDC at pin 25 of connector AC on the SHELF panel 86VU.
(5) Open the circuit breakers. Refer to the Para. 4.B.
(6) If you find damage, repair or replace wiring AWM 732504.
(7) If you find no damage or if fault continues:
(a) Replace EIU-2 [1KS2] AMM 73-25-34-400-802.
(b) Make sure that circuit breakers are closed.
(c) Do the test given in Para. 3.

Subtask 73-25-00-865-159-A ** ON A/C NOT FOR ALL

D. 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)
121VU	ENGINE/ENG2/FADEC B/AND EIU 2	4KS2	Q40

5. Close-up
Subtask 73-25-00-860-139-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.

[Rev.8 from Aug 2018] 2026.04.04 04:36:49 UTC