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 1 If the fault continues:
_
 - make sure that there is no ground signal at EIU 2 (1KS2) pin AA/5B (Ref. ASM 73-25/08).
 2 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) If there is no 28VDC:
 - do a check for open or short to ground at the aircraft wirings between the circuit breakers (2KS2), (4KS2) and EIU 2 (1KS2) pin AC/9, 11.
 1 If there is a short to ground:
_ - repair the defective wiring(s).
 2 If there is no short to ground:
_
 - replace the defective C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2) or the C/B-ENGINE/ENG2/FADEC B (4KS2).
 (c) Make sure that 28VDC supplies the BAT and ESS buses (Ref. ASM 73-25/05).
 C. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
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 TASK 77-00-00-810-885
 Loss of the Channels A and B of the FADEC on Engine 2
 1. Possible Causes_______________
 - harnesses J9 and J10

 - ECU (4000KS)

 - harness J9

 - harness J10

 - control alternator

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-00-00-710-006  Minimum Idle Check
 AMM 73-21-30-000-002  Removal of the Control Alternator
 AMM 73-21-30-400-002  Installation of the Control Alternator
 AMM 73-21-50-000-008  Removal of the J9 Harness
 AMM 73-21-50-000-009  Removal of the J10 Harness
 AMM 73-21-50-400-008  Installation of the J9 Harness
 AMM 73-21-50-400-009  Installation of the J10 Harness
 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 73-29-00-710-040  Operational Test of the FADEC on the ground (with Engine Motoring)
 ASM 73-25/18
 3. Fault Confirmation__________________
 A. Test
 (1) 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 fault symptom is identified by:
 - the upper ECAM warning ENG2 FADEC FAULT

 - no CFDS maintenance message after the test of the FADEC 2A and 2B

 - the crew observation N2 higher than 15% on ground or in flight

 (1) do a check for open or short to ground of the harnesses J9 and J10 between the ECU (4000KS) and the control alternator pins J9 and J10 /4, 5, 13, 14, 15 to pins J9/2, 3, 4, 5 (Ref. ASM 73-25/18).
 (a) If one of these wirings is not correct:

 - repair the defective wiring(s).

 (b) If these wirings are correct:

 - disconnect the harnesses J9 and J10 from the ECU (4000KS) and do a check of the ECU cables resistance between: . pins 5 and 13 (< 1 Ohm) . pins 5 and 14 (< 1 Ohm) . pins 5 and 15 (< 1 Ohm) . pins 5 and 4 (> 10 Megohms) . pin 5 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If the resistance values are out of the specified limits:
_
 - disconnect the harnesses J9 and J10 from the control alternator and do a check of the alternator resistance at between: . pins 2 and 5 (< 1 Ohm) . pins 3 and 5 (< 1 Ohm) . pins 4 and 5 (< 1 Ohm) . pin 5 and the ground (> 10 Megohms).
 a If the resistance values are in the specified limits:
_
 - replace the defective harness J9 (Ref. AMM TASK 73-21-50-000-008) and (Ref. AMM TASK 73-21-50-400-008) or the harness J10 (Ref. AMM TASK 73-21-50-000-009) and (Ref. AMM TASK 73-21-50-400-009).
 b If the resistance values are out of the specified limits:
　
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