DOC AIRBUS | TSM A320FDEU-B CAN Bus Fault
TASK 26-17-00-810-817-A
DEU-B CAN Bus Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 26-17-00-865-058-A ** ON A/C NOT FOR ALL
Subtask 26-17-00-810-104-A ** ON A/C NOT FOR ALL
Subtask 26-17-00-860-063-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:21 UTC
DEU-B CAN Bus Fault
1. Possible Causes
- wiring
- smoke detector
- DEU-B
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 26-17-00-810-821-A | Unexpected Lavatory Smoke-Detector |
| AMM 23-73-47-000-001 | Removal of the Decoder/Encoder Unit B (300RH) |
| AMM 23-73-47-400-001 | Installation of the Decoder/Encoder Unit B (300RH) |
| AMM 26-10-00-740-802 | Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) |
| ASM 261701 | |
| AMM 26-17-15-000-001 | Removal of the Lavatory Smoke Detector |
| AMM 26-17-15-000-008 | Removal of the Lavatory Smoke Detector |
| AMM 26-17-15-000-802 | Removal of the Smoke Detector of Lavatory A |
| AMM 26-17-15-000-808 | Removal of the Smoke Detector of Lavatory DS/ES/HS |
| AMM 26-17-15-000-809 | Removal of the Smoke Detector of Lavatory WC/FS/GS |
| AMM 26-17-15-400-001 | Installation of the Lavatory Smoke Detector |
| AMM 26-17-15-400-007 | Installation of the Lavatory Smoke Detector |
| AMM 26-17-15-400-802 | Installation of the Smoke Detector of Lavatory A |
| AMM 26-17-15-400-808 | Installation of the Smoke Detector of Lavatory DS/ES/HS |
| AMM 26-17-15-400-809 | Installation of the Smoke Detector of Lavatory WC/FS/GS |
Subtask 26-17-00-865-058-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
Subtask 26-17-00-710-078-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/CIDS/SDF/DIR2 ESS | 18WH | C06 |
| 49VU | AIR COND/CIDS/SDF/DIR1 ESS | 15WH | C05 |
| 122VU | AIR COND/CIDS/SDF/DIR NORM/2 | 14WH | T18 |
| 122VU | AIR COND/CIDS/SDF/DIR NORM/1 | 17WH | T17 |
B. Test
(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH.
(2) After 10 seconds, close the circuit breakers again.
(3) After a minimum time of 30 seconds, do the Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) AMM 26-10-00-740-802.
4. Fault Isolation(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH.
(2) After 10 seconds, close the circuit breakers again.
(3) After a minimum time of 30 seconds, do the Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) AMM 26-10-00-740-802.
Subtask 26-17-00-810-104-A ** ON A/C NOT FOR ALL
A. If the test gives a different maintenance message:
Subtask 26-17-00-810-113-A ** ON A/C NOT FOR ALL - Do the trouble shooting procedure related to the maintenance message.
B. If the test gives the maintenance message WRG: CAN BUS / SMK DET LAV X / DEU-B(FIN), (X = location of the related lavatory):
(1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
Subtask 26-17-00-810-162-E ** ON A/C NOT FOR ALL (1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
- Do a check and repair the wiring between the DEU-B(FIN) and the smoke detector ASM 261701.
- Replace the related smoke detector AMM 26-17-15-000-001, AMM 26-17-15-000-008 and AMM 26-17-15-400-001, AMM 26-17-15-400-007.
- Replace the related DEU-B AMM 23-73-47-000-001 and AMM 23-73-47-400-001.
C. If the test gives the maintenance message WRG: CAN BUS / SMK DET LAV X / DEU-B(FIN), (X = location of the related lavatory):
(1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
Subtask 26-17-00-810-162-F ** ON A/C NOT FOR ALL (1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
- Do a check and repair the wiring between the DEU-B(FIN) and the smoke detector ASM 261701.
- Replace the related smoke detector
AMM 26-17-15-000-802 and AMM 26-17-15-400-802 or AMM 26-17-15-000-808 and AMM 26-17-15-400-808.
- Replace the related DEU-B AMM 23-73-47-000-001 and AMM 23-73-47-400-001.
C. If the test gives the maintenance message WRG: CAN BUS / SMK DET LAV X / DEU-B(FIN), (X = location of the related lavatory):
(1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
Subtask 26-17-00-710-084-A ** ON A/C NOT FOR ALL (1) If the test gives the additional message WRG: SMK DET ADDRESS/ DEU B (FIN), start troubleshooting according to that message first (Ref. TSM TASK 26-17-00-810-821).
(2) If the fault continues:
- Do a check and repair the wiring between the DEU-B(FIN) and the smoke detector ASM 261701.
- Replace the related smoke detector
AMM 26-17-15-000-802 and AMM 26-17-15-400-802 or AMM 26-17-15-000-808 and AMM 26-17-15-400-808 or AMM 26-17-15-000-809 and AMM 26-17-15-400-809.
- Replace the related DEU-B AMM 23-73-47-000-001 and AMM 23-73-47-400-001.
D. Do the test given in Para. 3.
5. Close-upSubtask 26-17-00-860-063-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.