W DOC AIRBUS | TSM A320F

Loss of the Channel B of the FADEC on Engine 1

TASK 77-00-00-810-876-A
Loss of the Channel B of the FADEC on Engine 1

1. Possible Causes
  • ECU [4000KS]
  • C/B-ENGINE/ENG1/FADEC B/AND EIU 1 [4KS1]
  • harness J2
  • EIU-1 [1KS1]
  • aircraft wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 71-00-00-710-006
Minimum Idle Check
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 732505
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 77-00-00-710-191-A ** ON A/C NOT FOR ALL
A. Test
   (1) do the operational test of the FADEC 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
NOTE: Ignore the ECAM warning message ENG1 FADEC A FAULT when you do the test of the FADEC 1B.
Subtask 77-00-00-710-191-B ** ON A/C NOT FOR ALL
A. Test
   (1) do the operational test of the FADEC 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 77-00-00-865-058-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1/FADEC A/AND EIU 12KS1A04
121VUENGINE/ENG1/FADEC B/AND EIU 14KS1R41
Subtask 77-00-00-810-149-A ** ON A/C NOT FOR ALL
B. If the fault symptom is identified by the upper ECAM warning ENG1 FADEC B FAULT and the test of the FADEC 1B gives no maintenace message:
  • disconnect the connector J2 from the ECU (4000KS) and do a check for 28VDC at pin J2/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on).
   (1) If there is 28VDC:
     (a) If the fault continues:
  • do a check for circuit breakers (4KS1) close and (2KS1) open.
     (b) If the fault continues:
  • replace the C/B-ENGINE/ENG1/FADEC B/AND EIU 1 [4KS1] .
   (2) If there is no 28VDC:
  • do a check for 28VDC at EIU 1 (1KS1) pin AC/9 ASM 732505.
     (a) If there is 28VDC:
  • do a check for open or short to ground at the harness J2 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/2 to pin J2/13. Replace the harness J2 if necessary.
       1 If the fault continues:
  • make sure that there is no ground signal at EIU 1 (1KS1) pin AA/5B ASM 732508.
       2 If the fault continues:
     (b) If there is no 28VDC:
  • do a check for open or short to ground at the aircraft wiring between the circuit breaker (4KS1) and EIU 1 (1KS1) pin AC/9.
       1 If there is a short to ground:
  • repair the above wiring.
       2 If there is no short to ground:
  • replace the C/B-ENGINE/ENG1/FADEC B/AND EIU 1 [4KS1] .
     (c) Make sure that 28VDC supplies the BAT bus ASM 732505.
Subtask 77-00-00-710-192-A ** ON A/C NOT FOR ALL
C. Do a minimum idle check AMM 71-00-00-710-006.
[Rev.8 from Aug 2018] 2026.04.04 04:37:34 UTC
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