All engine 1 parameters are XX on the upper ECAM DU on ground at starting.

TASK 73-29-00-810-802-A
All engine 1 parameters are XX on the upper ECAM DU on ground at starting.

1. Possible Causes

wiring between the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) and the EIU 1 (1KS1)
SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN [6KS]
EIU-1 [1KS1]
wiring between the circuit breaker 4KS1 and the EIU 1 (1KS1)
wiring between the pin 2 of the connector 1KS1-AC and the pin 13 of the connector 4000KS-J2
wiring between the circuit breaker 2KS1 and the EIU 1 (1KS1)
wiring between the pin 7 of the connector 1KS1-AC and the pin 13 of the connector 4000KS-J4

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 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-004	Engine Manual Start
ASM 732505
ASM 732508
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-710-040	Operational Test of the Engine Interface Unit
AMM 73-25-34-710-043	Operational Test of the Engine Interface Unit

3. Fault Confirmation
Subtask 73-29-00-865-050-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 73-29-00-860-062-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 73-29-00-865-055-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 73-29-00-860-050-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 73-29-00-710-052-A ** ON A/C NOT FOR ALL

E. Test
(1) On the panel 50VU, release the ENG/FADEC GND PWR/1 pushbutton switch (ON legend on).

4. Fault Isolation
Subtask 73-29-00-810-052-A ** ON A/C NOT FOR ALL

A. If the test does not show XX on the upper ECAM DU, but shows engine 1 parameters:
(1) Do a check and repair the wiring between the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) and the EIU 1 (1KS1), ASM 732508.
(2) If the fault continues:

replace the SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN [6KS] .

(3) If the fault continues:

replace the EIU-1 [1KS1] , AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 73-29-00-810-053-A ** ON A/C NOT FOR ALL

B. If the test does not show engine 1 parameters on the upper ECAM DU, but shows XX:
(1) Make sure that there is 28VDC at the pin 9 of the connector 1KS1-AC ASM 732505.
(a) If there is no 28VDC:

do a check and repair the wiring between the circuit breaker 4KS1 and the EIU 1 (1KS1).

(b) If there is 28VDC:

do a check and repair the wiring between the pin 2 of the connector 1KS1-AC and the pin 13 of the connector 4000KS-J2 .

(2) If the fault continues:

make sure that there is 28VDC at the pin 11 of the connector 1KS1-AC ASM 732505.

(a) If there is no 28VDC:

do a check and repair the wiring between the circuit breaker 2KS1 and the EIU 1 (1KS1).

(b) If there is 28VDC:

do a check and repair the wiring between the pin 7 of the connector 1KS1-AC and the pin 13 of the connector 4000KS-J4 .

(3) If the fault continues:

replace the EIU-1 [1KS1] , AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 73-29-00-710-053-A ** ON A/C NOT FOR ALL

C. Test
(1) Do the operational test of the Engine Interface Unit AMM 73-25-34-710-040.
(2) Make sure that all engine 1 parameters are shown on the upper ECAM DU when you start the engine again AMM 71-00-00-710-003 or AMM 71-00-00-710-004.

Subtask 73-29-00-710-053-B ** ON A/C NOT FOR ALL

C. Test
(1) Do the operational test of the Engine Interface Unit AMM 73-25-34-710-043.
(2) Make sure that all engine 1 parameters are shown on the upper ECAM DU when you start the engine again AMM 71-00-00-710-003 or AMM 71-00-00-710-004.

5. Close-up
Subtask 73-29-00-860-051-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