Internal Failure of the ECU on Engine 1

TASK 76-11-00-810-811-A
Internal Failure of the ECU on Engine 1

1. Possible Causes

ECU [4000KS]
DMU [1TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-36-34-000-001	Removal of the Data Management Unit (DMU)
AMM 31-36-34-400-001	Installation of the Data Management Unit (DMU)
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 73-21-60-740-007	Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance Report
ASM 732510
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 76-11-00-710-072-A ** ON A/C NOT FOR ALL

A. Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 76-11-00-810-064-C ** ON A/C NOT FOR ALL

A. If the ECAM Warning "THR LEVER FAULT" is not associated with failure messages TLA SNSR, J3, ECU and TLA SNSR, J4, ECU this is most likely indicating an internal failure of the ECU. In such a case this ECAM Warning is usually displayed with other engine related ECAM Warnings.
This can be checked in the Post Flight Report (PFR) AMM 73-21-60-740-007.
(1) If the test does not give the failure messages TLA SNSR, J3, ECU and TLA SNSR, J4, ECU:

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

(a) If the fault repeats and is accompagned by failure message NO ECU 1(2) ADATA:

replace the DMU [1TV] AMM 31-36-34-000-001 and AMM 31-36-34-400-001.

1 If the fault continues:

Do a continuity and insulation check of the wiring between the ECU (ARINC OUTPUT) connector J3 (pins 11 and 24) / connector J4 (pins 11 and 24) and FWC 1 and 2 ASM 732510.

a if damage is found:

replace or repair wiring as required.

b if nothing is found:

repeat the fault isolation procedure.

(2) If the test gives the failure messages TLA SNSR, J3, ECU and/or TLA SNSR, J4, ECU:

Do the related troubleshooting procedure.

Subtask 76-11-00-710-078-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.
(1) No additionnal maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:37:25 UTC