- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 71-50-00-810-811
 Loss of All Signals from the EIU to the FADEC on Engine 1
 1. Possible Causes
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 - EIU-1 (1KS1)

 - ENGINE/1/FADEC A/AND EIU 1 (2KS1)

 - ENGINE/ENG1/FADEC B/AND EIU (4KS1)

 - connector J3 at the ECU (4000KS)

 - harness J3

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit R (ECU)(4000KS) AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine non Motoring)
 ASM 73-25/05
 ASM 73-25/10

 3. Fault Confirmation
__________________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/1/FADEC A/AND EIU 1 2KS1 A04 121VU ENGINE/ENG1/FADEC B/AND EIU 1 4KS1 R41
 B. Do the operational test of the FADEC 1A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
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 A. If the test gives the maintenance message EIU (ARINC), J3:
 - do a visual check of the connector J3 at the ECU (4000KS) for integrity (Ref. ASM 73-25/10).
 (1) If the fault continues do a check of the status of circuit breakers 2KS1 and 4KS1 (Ref. ASM 73-25/05).
 (a) If the circuit breakers 2KS1 and 4KS1 are closed:
 - do a check for 28VDC at EIU 1 pins AC/9, 11.
 1 If there is 28VDC:

_
 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 2 If there is not 28VDC:
_
 - do a check of the wiring between the circuit breakers 2KS1 and 4KS1 and the EIU 1 pins AC/9, 11.

 - if there is no continuity:

 - repair the wiring.

 - if there is continuity:

 - replace the ENGINE/1/FADEC A/AND EIU 1 (2KS1) and/or ENGINE/ENG1/FADEC B/AND EIU (4KS1).

 (b) If the circuit breakers 2KS1 and/or 4KS1 are open:
 - close them.
 1 If they trip again:
_
 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 a If the fault continues:
_
 - do a check of the wiring for short to ground between the circuit breakers 2KS1 and/or 4KS1 and the EIU 1.

 - if the wiring is not correct:

 - repair it.

 - if the wiring is correct:

 - replace the ENGINE/1/FADEC A/AND EIU 1 (2KS1) and/or ENGINE/ENG1/FADEC B/AND EIU (4KS1).

 (2) If the fault continues:

 - replace the harness J3.

 (3) If the fault continues:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 71-50-00-810-812
 Loss of all Signals from the EIU to the FADEC on Engine 2
 1. Possible Causes
_______________
　
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