Loss of the Output 2 Bus of the ECU Channel A on Engine 1 or 2

TASK 73-29-00-810-814-A
Loss of the Output 2 Bus of the ECU Channel A on Engine 1 or 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
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)
ASM 732510

3. Fault Confirmation
Subtask 73-29-00-740-054-A ** ON A/C NOT FOR ALL

A. Do the EIS input test AMM 31-60-00-740-002.

Subtask 73-29-00-740-054-B ** ON A/C NOT FOR ALL

A. Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 73-29-00-810-068-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC2 : NO ECU 1A DATA:

(1) If the fault continues:

do a check and repair the aircraft wiring of the output 2 bus on channel A from the ECU (4000KS) to the first terminal block ASM 732510.

Subtask 73-29-00-810-069-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message DMC 2 : NO ECU 2 A DATA:

(1) If the fault continues:

do a check and repair the aircraft wiring of the output 2 bus on channel A from the ECU (4000KS) to the first terminal block ASM 732510.

Subtask 73-29-00-740-055-A ** ON A/C NOT FOR ALL

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:35:52 UTC