W DOC AIRBUS | TSM A320F

Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1

TASK 73-25-00-810-895-A
Loss of Data on the ARINC Bus from the EIU to the FADEC on Engine 1

1. Possible Causes
  • harness J3 from EIU-1 (1KS1) to ECU (4000KS)
  • EIU-1 [1KS1]
  • 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)
ASM 732506
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 73-25-00-710-238-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 73-25-00-810-146-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message EIU (155), J3:
  • do a check for open or short to ground at pins AB/5A, 5C to pins J3/22, 23 of the harness J3 from EIU-1 (1KS1) to ECU (4000KS) ASM 732506.
   (1) If the wiring is not correct:
  • repair the above harness J3.
   (2) If the wiring is correct:
   (3) If the fault continues:
Subtask 73-25-00-810-146-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CFDIU, EIU (155), J3*:
  • do a check for open or short to ground at pins AB/5A, 5C to pins J3/22, 23 of the harness J3 from EIU-1 (1KS1) to ECU (4000KS) ASM 732506.
   (1) If the wiring is not correct:
  • repair the above harness J3.
   (2) If the wiring is correct:
   (3) If the fault continues:
Subtask 73-25-00-710-250-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:35:46 UTC
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