A. Do the operational test of the FADEC 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message EIU, ECU (CR3 DIODE):
 - disconnect the connectors J1 and J2 from the ECU (4000KS) and do a check for 28VDC at pins J1/13 and J2/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on) (Ref. ASM 73-25/05).
 (1) If there is 28VDC:
 - replace the EIU-2 (1KS2) (the most possible failure is the EIU 28V relay) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)

 - replace the ECU (4000KS) (the most possible failure is an ECU diode) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

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 E 56 E E E (2) If there is no 28VDC:

 - do a check for 28VDC at EIU 2 (1KS2) pins AC/9, 11 (Ref. ASM 73-25/05).
 (a) If there is no 28VDC:
 - do a check for open or short to ground at the aircraft wiring from the circuit breakers (2KS2) and (4KS2) to EIU 2 (1KS2) pins AC/9, 11.
 1 If there is a short to ground:
_ - repair the above wiring.
 2 If there is no short to ground:
_
 - replace the defective C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2) or C/B-ENGINE/ENG 2/FADEC B (4KS2).
 (b) If there is 28VDC:

 - do a check for open or short to ground at the harnesses J1 and J2 between the EIU 2 (1KS2) and the ECU (4000KS), pins AC/2, 7 to pins J1/13, J2/13. Replace the harness J1 or J2 if necessary (Ref. ASM 73-25/05).

 (c) If the fault continues:

 - make sure that there is no ground signal at EIU 2 (1KS2) pin AA/5B (Ref. ASM 73-25/08).

 (d) If the fault continues:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
 B. Do the test given in Para. 3.A.
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 FADEC SYSTEM - FAULT ISOLATION PROCEDURES

_________________________________________
 TASK 73-29-00-810-802
 All engine 1 parameters are XX on the upper ECAM DU on ground at starting.
 1. Possible Causes
_______________
 - SEL SW-ENG/MODE/CRANK/AUTO IGN/IGN (6KS)

 - EIU-1 (1KS1)

 - wiring between the ENG/MODE/CRANK/AUTO IGN/IGN selector switch (6KS) and the 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 circuit breaker(s) safety clip(s)
 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
 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 73-25-34-710-043 Operational Test of the Engine Interface Unit
 ASM 73-25/05
 ASM 73-25/08

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