DOC AIRBUS | TSM A320FExternal CAN bus problem
TASK 26-16-00-810-830-A
External CAN bus problem
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 26-16-00-865-073-A ** ON A/C NOT FOR ALL
Subtask 26-16-00-810-130-A ** ON A/C NOT FOR ALL
Subtask 26-16-00-860-078-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:19 UTC
External CAN bus problem
1. Possible Causes
- wiring
- connector AA
- smoke detectors
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 26-10-00-740-802 | Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) |
| ASM 261602 |
Subtask 26-16-00-865-073-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
Subtask 26-16-00-740-051-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, wait for approximately 10 seconds and close them again, wait for a minimum of 30 seconds before you start the test.
(2) 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, wait for approximately 10 seconds and close them again, wait for a minimum of 30 seconds before you start the test.
(2) 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 26-16-00-810-130-A ** ON A/C NOT FOR ALL
A. If the test gives a maintenance message which is different from the maintenance message given in step 4.B:
Subtask 26-16-00-810-131-A ** ON A/C NOT FOR ALL - Do the troubleshooting related to the maintenance message.
B. If the test gives the maintenance message
WRG: CAN BUS A/ CIDS(101RH)-SDF1 or WRG: CAN BUS A/ CIDS(102RH)-SDF2:
Subtask 26-16-00-810-132-A ** ON A/C NOT FOR ALL WRG: CAN BUS A/ CIDS(101RH)-SDF1 or WRG: CAN BUS A/ CIDS(102RH)-SDF2:
- Do a check and repair the wiring between the related CIDS director connector AA pin 13G and 14C to all the smoke detectors installed on CAN bus A ASM 261602.
C. If the test gives the maintenance message
WRG: CAN BUS B/ CIDS(101RH)-SDF1 or WRG: CAN BUS B/ CIDS(102RH)-SDF2:
Subtask 26-16-00-710-105-A ** ON A/C NOT FOR ALL WRG: CAN BUS B/ CIDS(101RH)-SDF1 or WRG: CAN BUS B/ CIDS(102RH)-SDF2:
- Do a check and repair the wiring between the related CIDS director connector AA pin 14F and 14G to all the smoke detectors installed on CAN bus B ASM 261602.
D. Do the test given in Para. 3.
5. Close-upSubtask 26-16-00-860-078-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.