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 TASK 73-25-00-810-920
 Loss of 28VDC Power Supply of the ECU on the Engine 1
 1. Possible Causes
_______________
 - EIU-1 (1KS1)

 - 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 1A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 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
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 B. 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).

 (2) If there is no 28VDC:

 - 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).
 C. Do the test given in Para. 3.A.
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 TASK 73-25-00-810-921
 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 -------------------------------------------------------------------------------
　
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