All engine 1 parameters are XX on the upper ECAM DU on the ground with the FADEC GND PWR pushbutton switch set to ON.

TASK 73-29-00-810-806-A
All engine 1 parameters are XX on the upper ECAM DU on the ground with the FADEC GND PWR pushbutton switch set to ON.

1. Possible Causes

wiring between the FADEC GND PWR pushbutton switch (7KS1) and the EIU 1 (1KS1)
P/BSW-ENG/FADEC GND PWR/1 (7KS1)

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure
AMM 73-21-60-720-040	Functional Test of the Electronic Control Unit (ECU)
ASM 732508

3. Fault Confirmation
Subtask 73-29-00-865-052-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41

Subtask 73-29-00-860-064-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration

NOTE: If the circuit breakers 2KS1, 4KS1 are opened, stop for 5 minutes before you start the procedure.

Subtask 73-29-00-865-056-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

Subtask 73-29-00-860-058-A ** ON A/C NOT FOR ALL

D. Job Set-Up
(1) On the panel 115VU, make sure that:
(a) The ENG/MODE/CRANK/AUTO IGN/IGN selector switch is set to NORM.
(b) The ENG MASTER 1 switch is set to OFF.
(2) On the panel 22VU, make sure that the ENG/MAN START/1 pushbutton switch is released.
(3) Do the EIS start procedure AMM 31-60-00-860-001.

Subtask 73-29-00-710-058-A ** ON A/C NOT FOR ALL

E. Do this test:

ACTION	RESULT
1.On the panel 115VU, set the ENG/MODE/CRANK/AUTO IGN/IGN selector switch to IGN START.	The upper display unit of the ECAM system does not show XX but shows engine parameters: N1 = 0 N2 = 0 FF = 0 EGT = ambient temperature

4. Fault Isolation
Subtask 73-29-00-810-060-A ** ON A/C NOT FOR ALL

A. If the test is confirmed:
(1) Do a check and repair the wiring between the FADEC GND PWR pushbutton switch (7KS1) and the EIU 1 (1KS1), ASM 732508.
(2) If the fault continues:

replace the P/BSW-ENG/FADEC GND PWR/1 (7KS1).

Subtask 73-29-00-720-050-A ** ON A/C NOT FOR ALL

B. Do the functional test of the ECU AMM 73-21-60-720-040.

5. Close-up
Subtask 73-29-00-860-059-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure AMM 31-60-00-860-002.

[Rev.8 from Aug 2018] 2026.04.04 04:35:51 UTC