W DOC AIRBUS | TSM A320F

Loss of the Channel B of the FADEC on Engine 2

TASK 77-00-00-810-880-A
Loss of the Channel B of the FADEC on Engine 2

1. Possible Causes
  • ECU [4000KS]
  • C/B-ENGINE/ENG2/FADEC B/AND EIU 2 [4KS2]
  • harness J2
  • EIU-2 [1KS2]
  • 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 77-00-00-710-195-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 2B on the ground (with engine motoring) AMM 73-29-00-710-040.
NOTE: Ignore the ECAM warning message ENG2 FADEC A FAULT when you do the test of the FADEC 2B.
Subtask 77-00-00-710-195-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 2B on the ground (with engine motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 77-00-00-865-060-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/2/FADEC A/AND EIU 22KS2A05
121VUENGINE/ENG2/FADEC B/AND EIU 24KS2Q40
Subtask 77-00-00-810-151-A ** ON A/C NOT FOR ALL
B. If the fault symptom is identified by the upper ECAM warning ENG2 FADEC B FAULT:
  • 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 (4KS2) close and (2KS2) open.
     (b) If the fault continues:
  • replace the C/B-ENGINE/ENG2/FADEC B/AND EIU 2 [4KS2] .
   (2) If there is no 28VDC:
  • do a check for 28VDC at EIU 2 (1KS2) 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 2 (1KS2) 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 2 (1KS2) 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 (4KS2) and EIU 2 (1KS2) 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/ENG2/FADEC B/AND EIU 2 [4KS2] .
     (c) Make sure that 28VDC supplies the BUS 2 ASM 732505.
Subtask 77-00-00-710-196-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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