ACSC CIDS 1+2 Input Fault

TASK 21-61-00-810-887-A
ACSC CIDS 1+2 Input Fault

1. Possible Causes

wiring
CONT-AIR COND SYSTEM 1 [47HH]
CONT-AIR COND SYSTEM 2 [57HH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System Controller
ASM 216301
ASM 216303
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS

3. Fault Confirmation
Subtask 21-61-00-710-173-A ** ON A/C NOT FOR ALL

A. Test
(1) Do a read out of the POST FLIGHT REPORT and check for CLASS 2 Chapter 21 messages.
(2) Do the CIDS Interface and Power-Up test through the CFDS AMM 23-73-00-740-005.

4. Fault Isolation
Subtask 21-61-00-810-221-B ** ON A/C NOT FOR ALL

A. If the POST FLIGHT REPORT gives the maintenance messages CIDS1(101RH) +CIDS2(102RH):

do a check of the wiring from:
ASM 216303 the ACSC1 (47HH/AA) pin 1D to the DIR-SIDS, 1 (101RH/AA) pin 6A,
the ACSC1 (47HH/AA) pin 1E to the DIR-SIDS, 1 (101RH/AA) pin 6B,
ASM 216301 the ACSC2 (57HH/AA) pin 1D to the DIR-SIDS, 2 (102RH/AA) pin 6A and,
the ACSC2 (57HH/AA) pin 1E to the DIR-SIDS, 2 (102RH/AA) pin 6B.

(1) If the fault continues:
Replace the CONT-AIR COND SYSTEM 1 [47HH] and the CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.

[Rev.8 from Aug 2018] 2026.04.04 04:24:57 UTC