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 A. If the test gives the maintenance message EIU - 28V, ECU:
 - do a check of the status of the circuit breaker (2KS1).
 (1) If the circuit breaker is closed:
 - disconnect the connector J1 from the ECU (4000KS) and do a check for 28VDC at pins J1/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on) (Ref. ASM 73-25/05).
 (a) 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).

 (b) If there is no 28VDC:

 - do a check for 28VDC at EIU 1 (1KS1) pin AC/11 (Ref. ASM 73-25/05).
 1_ If there is no 28VDC:
 - do a check for open or short to ground at the aircraft
 wiring from the circuit breaker (2KS1) to EIU 1 (1KS1) pin
 AC/11.

 a If there is a short to ground:
_ - repair the above wiring.

 b If there is no short to ground:
_ - replace the C/B-ENGINE/1/FADEC A/AND EIU 1 (2KS1).

 2 If there is 28VDC:
_

 - do a check for open or short to ground at the harness J1 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/7 to pin J1/13. Replace the harness J1 if necessary (Ref. ASM 73-25/05).
 3 If the fault continues:
_

 - make sure that there is no ground signal at EIU 1 (1KS1) pin AA/5B (Ref. ASM 73-25/08).
 (c) 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).
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 - close the circuit breaker.
 (a) If the circuit breaker trips:

 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If the fault continues:

 - do a check for a short to ground at the harness J1 between the EIU 1 (1KS1) and the ECU (4000KS), pin AC/7 to pin J1/13.
 1 If there is a short to ground:
_ - replace the harness J1.

 2 If there is no short to ground:
_

 - do a check for a short to ground at the aircraft wiring between EIU 1 (1KS1) pins AC/11 and the circuit breaker (2KS1).
 a If there is a short to ground:
_ - repair the above wiring.

 b If there is no short to ground:
_ - replace the C/B-ENGINE/1/FADEC A/AND EIU 1 (2KS1).

 B. Do the test given in Para. 3.B.
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 Loss of the 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)

 - harness J1

 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. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/2/FADEC A/AND EIU 2 2KS2 A05
　
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