EIU-1 Position Fault

TASK 73-25-00-810-A46-A
EIU-1 Position Fault

1. Possible Causes

aircraft wiring
EIU-1 [1KS1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AWM 732503
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)
AMM 73-25-34-860-806	Engine Interface Unit (EIU) DISCRETE INPUTS Menu Data Status

3. Fault Confirmation
Subtask 73-25-00-710-483-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 73-25-00-810-327-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Check the status of EIU-1 discrete input for ENGINE 1 and ENGINE 2 AMM 73-25-34-860-806.
(a) Check the status of ENGINE 1 is 1 and the status of ENGINE 2 is 0.
(b) If the status of ENGINE 1 is not 1:
1 Repair or replace aircraft wiring to have the pin 3A of connector AA at ground AWM 732503.
(c) If the status of ENGINE 2 is not 0:
1 Repair aircraft wiring to have the pin 4B of connector AA unused AWM 732503.
(d) Do the test given in Para. 3.
(2) If both statuses are correct or if the fault continues:
(a) Replace EIU-1 [1KS1] AMM 73-25-34-000-802 and AMM 73-25-34-400-802.

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