Loss of TCM information between EIU and ECU

TASK 73-20-00-810-984-A
Loss of TCM information between EIU and ECU

1. Possible Causes

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)
ASM 732508
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 73-20-00-710-338-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 73-20-00-810-286-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message EIU(150), J3:

Remove EIU
Disconnect J3 harness from ECU
Do a continuity check between:
. pins 5C from EIU receptacle connector AB and 22 from J3 harness
. pins 5A from EIU receptacle connector AB and 23 from J3 harness

(1) If there is continuity:

(a) If the fault continues:

(2) If there is no continuity:

Subtask 73-20-00-710-339-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:32 UTC