No Data from CFDIU (131-9(A))

TASK 49-00-81-810-873-A
No Data from CFDIU (131-9(A))

1. Possible Causes

CFDIU AC ID FAILURE
ELECTRONIC CONTROL BOX [59KD]
aircraft wiring
CFDIU [1TW]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 313204
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 49-00-00-710-009	Self-Test of the ECB
AMM 49-00-00-860-008	APU Start by External Power
AMM 49-61-34-000-003	Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-003	Installation of the Electronic Control Box (ECB) (131-9(A))

3. Fault Confirmation
Subtask 49-00-81-710-194-A ** ON A/C NOT FOR ALL

A. Read-out of ECB Trouble-Shooting Data
(1) Put the APU MASTER SW to the ON position.
(2) Get access to the APU LAST LEG/PREVIOUS LEG report.
(3) Push the '>'-key adjacent to the related CFDS failure message.
(4) If the MCDU menu shows:
CFDIU AC ID FAILURE

do the Fault Confirmation that follows:

(a) Start the APU and apply Electrical Load and Bleed Air AMM 49-00-00-860-008.
(b) Get access to the APU GND SCANNING menu.

4. Fault Isolation
Subtask 49-00-81-810-135-A ** ON A/C NOT FOR ALL

A. If the APU GND SCANNING menu gives the maintenance message:

NO DATA FROM CFDIU

associated with Fault Code Numbers (FCN) 157 or 158 or 159

do the Self-Test of the ELECTRONIC CONTROL BOX [59KD] AMM 49-00-00-710-009.

(1) If the test shows a malfunction of the ECB (59KD):

replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-003 and AMM 49-61-34-400-003.

(2) If the fault continues:

do a check/repair of the aircraft wiring between the ECB (59KD) 59KD-AB/K8,K9,K5,K6 and the CFDIU (1TW) 1TW-AA/F10,G10,F11,G11 ASM 313204.

(a) If the fault continues:

replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-000-001.

Subtask 49-00-81-710-195-A ** ON A/C NOT FOR ALL

B. Do a check of the APU GND SCANNING menu to verify the fault is not present.

[Rev.8 from Aug 2018] 2026.04.04 04:34:37 UTC