- ECU (4000KS)

 - aircraft wiring

 - C/B-ENGINE/1/FADEC A/AND EIU 1 (2KS1)

 - C/B-ENGINE/ENG 1/FADEC B/AND EIU 1 (4KS1)

 - harnesses J1 and J2

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
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 (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 Motoring)
 ASM 73-25/05
 ASM 73-25/08

 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B 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-1 (1KS1) (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 E 56 E E E (2) If there is no 28VDC:

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 - do a check for 28VDC at EIU 1 (1KS1) 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 (2KS1) and (4KS1) to EIU 1 (1KS1) 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/1/FADEC A/AND EIU 1 (2KS1) or C/B-ENGINE/ENG 1/FADEC B/AND EIU 1 (4KS1).
 (b) If there is 28VDC:

 - do a check for open or short to ground at the harnesses J1 and J2 between the EIU 1 (1KS1) 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 1 (1KS1) pin AA/5B (Ref. ASM 73-25/08).

 (d) If the fault continues:

 - replace the EIU-1 (1KS1) (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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 Loss of 28VDC Power Supply of the ECU on the Engine 2
 1. Possible Causes
_______________
 - EIU-2 (1KS2)

 - ECU (4000KS)

 - aircraft wiring

 - C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2)

 - C/B-ENGINE/ENG 2/FADEC B (4KS2)

 - harnesses J1 and J2

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-25-34-000-040 
AMM  73-25-34-400-040 
AMM  73-29-00-710-040 
ASM  73-25/05
 ASM  73-25/08

 3. Fault Confirmation
__________________
Removal of the Electronic Control Unit (ECU)(4000KS)
Installation of the Electronic Control Unit
 (ECU)(4000KS)
Removal of the Engine Interface Unit (EIU)
 (1KS1,1KS2)
Installation of the Engine Interface Unit (EIU)
 (1KS1,1KS2)
Operational Test of the FADEC on the ground (with
　
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