Internal Failure of the ECU on Engine 1

TASK 71-50-00-810-818-A
Internal Failure of the ECU on Engine 1

1. Possible Causes

ECU [4000KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 71-50-00-710-083-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
(2) Read the CLASS 3 FAULT REPORT on the MCDU.

4. Fault Isolation
Subtask 71-50-00-810-071-A ** ON A/C NOT FOR ALL

A. If the CLASS 3 FAULTS page gives the maintenance message J4, ECU:

replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:34:59 UTC