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 F 『 E C F M E E E E 56 E E E (b) If the fault continues:

 - do a check for a short to ground at the harness J2 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/2 to pin J2/13.
 1 If there is a short to ground:
_ - replace the harness J2.
 2 If there is no short to ground:
_
 - do a check for a short to ground at the aircraft wiring between EIU 2 (1KS2) pin AC/9 and the circuit breaker (4KS2).
 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/ENG 2/FADEC B (4KS2).
 3 Make sure that 28VDC supplies the BUS 2 (Ref. ASM 73-25/05).
_
 B. Do the test given in Para. 3.B.
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 Loss of the Channel A on the Engine 2
 1. Possible Causes
_______________
 - EIU-2 (1KS2)

 - ECU (4000KS)

 - harness J1

 - aircraft wiring

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

 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
 B. Test
 (1) If the circuit breaker (2KS2) is open, refer to Para. 4.A.(2).

 (2) Do the operational test of the FADEC 2A and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).

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 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU, EIU 28V, J1:
 - do a check of the status of the circuit breaker (2KS2).
 (1) If the circuit breaker is closed:
 - disconnect the connector J1 from the ECU (4000KS) and do a check for 28VDC at pin J1/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on).
 (a) If there is 28VDC:

 - replace the ECU (4000KS) (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 2 (1KS2) pin AC/11 (Ref. ASM 73-25/05).
 1 If there is 28VDC:
_
 - do a check for open or short to ground at the harness J1 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/7 to pin J1/13. Replace the harness J1 if necessary.
 a If the fault continues:
_
 - make sure that there is no ground signal at EIU 2 (1KS2) pin AA/5B (Ref. ASM 73-25/08).
 b 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).
 2 If there is no 28VDC:
_
 - do a check for open or short to ground at the aircraft wiring between the circuit breaker (2KS2) and EIU 2 (1KS2) 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/2/FADEC A/AND EIU 2 (2KS2).
 3 Make sure that 28VDC supplies the ESS bus (Ref. ASM 73-25/05).
_
 (2) If the circuit breaker (2KS2) is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips:
　
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