Loss of the Communication from CFDIU

TASK 36-11-00-810-A12-A
Loss of the Communication from CFDIU

1. Possible Causes

CFDIU [1TW]
wiring
BMC-1 [1HA1]
BMC-2 [1HA2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 36-11-00-740-802	BITE Test of the Engine Bleed Air System (EBAS) (System Test)
ASM 361103
AMM 36-11-34-000-001	Removal of the BMC
AMM 36-11-34-400-001	Installation of the BMC

3. Fault Confirmation
Subtask 36-11-00-740-106-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the EBAS AMM 36-11-00-740-802.

4. Fault Isolation
Subtask 36-11-00-810-428-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
NO DATA FROM CFDIU
(1) Replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.

Subtask 36-11-00-810-429-A ** ON A/C NOT FOR ALL

B. If the fault continues:
(1) Do a check of the wiring from CFDIU (1TW) pin AA/11F and pin AA/11G to the BMC1 (1HA1) pin AA/10C and pin AA/10D ASM 361103.
(a) If the wiring is damaged:

Repair or replace the wiring .

(2) Do the test given in Para. 3.

Subtask 36-11-00-810-430-A ** ON A/C NOT FOR ALL

C. If the fault continues:
(1) Replace the BMC-1 [1HA1] AMM 36-11-34-000-001 and AMM 36-11-34-400-001.
(1) Do the test given in Para. 3.

Subtask 36-11-00-810-431-A ** ON A/C NOT FOR ALL

D. If the fault continues:
(1) Do a check of the wiring from BMC1 (1HA1) pin AB/11D and pin AB/11E to BMC2 (1HA2)pin AA/10C and pin AA/10D ASM 361103.
(a) If the wiring is damaged:

Repair or replace the wiring .

(2) Do the test given in Para. 3.

Subtask 36-11-00-810-474-A ** ON A/C NOT FOR ALL

E. If the fault continues:
(1) Replace the BMC-2 [1HA2] AMM 36-11-34-000-001 and AMM 36-11-34-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:33:55 UTC