EIU-2 Fault to Supply ICV A and B

TASK 73-25-00-810-A33-A
EIU-2 Fault to Supply ICV A and B

1. Possible Causes

EIU-2 [1KS2]
HARNESS-FAN, WF02 [4218KS]
HARNESS-FAN, WF01 [4217KS]

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

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

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 73-25-34-000-802	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 783605

3. Fault Confirmation
Subtask 73-25-00-710-470-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 73-25-00-810-309-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.
(3) If the fault continues, troubleshoot as follows:

Subtask 73-25-00-865-088-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)
121VU	ICU B/ENG2 PWR SPLY	101KS2	R43
121VU	ICU A/ENG2 PWR SUPPLY	22KS2	R40

Subtask 73-25-00-810-310-A ** ON A/C NOT FOR ALL

C. Check for harness fault:
(1) Open the fan cowl doors AMM 71-13-00-010-802.
(2) Use a PLIERS - JAWED, SOFT to disconnect connectors (P402) and (P403) and check for 28 VDC at pin 15 of both connectors (402VC2) and (403VC2).
(3) If there is 28 VDC at pin 15 of connector (402VC2):
(a) Repair or replace aircraft wiring AWM 783605.
(4) If there is not 28 VDC:
(a) Replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802.
(5) If there is 28 VDC at pin 15 of connector (403VC2):
(a) Repair or replace aircraft wiring AWM 783605.
(6) If there is not 28 VDC:
(a) Replace HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802.
(7) If necessary, connect connectors (P402) and (P403).
(8) Close the circuit breakers. Refer to the Para. 5.B.
(9) Do the test given in Para. 3.

5. Close-up
Subtask 73-25-00-860-077-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 73-25-00-865-089-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)
121VU	ICU B/ENG2 PWR SPLY	101KS2	R43
121VU	ICU A/ENG2 PWR SUPPLY	22KS2	R40

[Rev.8 from Aug 2018] 2026.04.04 04:36:28 UTC