W DOC AIRBUS | TSM A320F

Failure of the ENG MASTER SW 2 Signal to the GCU 2

TASK 24-20-00-810-865-A
Failure of the ENG MASTER SW 2 Signal to the GCU 2

1. Possible Causes
  • GCU-2 [1XU2]
  • CTL SW-ENG/MASTER 2 [2KC]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 242203
AMM 24-22-34-000-001
Removal of the GCU-1(2)
AMM 24-22-34-400-001
Installation of the GCU-1(2)
AMM 24-41-00-740-002
Operational Check of the GAPCU via the CFDS
ASM 761201
3. Fault Confirmation
Subtask 24-20-00-740-066-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
     (a) If the BITE test gives the message TEST FAILED:
  • do the trouble shooting given in Para 4.A.
     (b) If the BITE test gives the message TEST PASSED:
  • do the trouble shooting given in Para 4.B.
4. Fault Isolation
Subtask 24-20-00-810-191-A ** ON A/C NOT FOR ALL
A. If the BITE test gives the message TEST FAILED:
  • push the line key adjacent to the TEST FAILED message.
   (1) If the maintenance message GCU2 (1XU2) comes into view:
Subtask 24-20-00-810-136-A ** ON A/C NOT FOR ALL
B. If the BITE test gives the message TEST PASSED:
  • do a check of the contact of the ENG/MASTER 2 control switch (2KC) for correct operation between pins 3A and 1A ASM 761201.
   (1) If the contact do not operate correctly:
  • replace the CTL SW-ENG/MASTER 2 [2KC] on the ENG panel 115VU.
   (2) If the contact operate correctly:
  • do a check of the fuel-cutoff status wiring ASM 242203 for an open circuit between pin 3A of the ENG/MASTER 2 control switch and pin A/8C of the GCU 2.
     (a) If there is no continuity:
  • repair or replace as necessary.
     (b) If there is continuity:
Subtask 24-20-00-740-067-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:26:16 UTC
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