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 - 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 harness J9 from the control alternator and do a check of the alternator resistance 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 harness J9 (Ref. AMM TASK 73-21-50-000-008) and (Ref. AMM TASK 73-21-50-400-008).
 b If the resistance values are out of the specified limits:
_
 - replace the control alternator (Ref. AMM TASK 73-21-30-000-002) and (Ref. AMM TASK 73-21-30-400-002).
 B. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
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 TASK 77-00-00-810-880
 Loss of the Channel B of the FADEC on Engine 2
 1. Possible Causes
_______________
 - EIU-2 (1KS2)

 - ECU (4000KS)

 - harness J2

 - aircraft wiring

 - C/B-ENGINE/ENG 2/FADEC B (4KS2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-00-00-710-006 Minimum Idle Check 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. Test
 (1) Do the operational test of the FADEC 2B 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
 -------------------------------------------------------------------------------
121VU ENGINE/ENG2/FADEC B 4KS2 Q40
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 B. If the fault symptom is identified by the upper ECAM warning ENG2 FADEC B FAULT:
 - disconnect the connector J2 from the ECU (4000KS) and do a check for 28VDC at pin J2/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on).
 (1) 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).

 (2) If there is no 28VDC:

 - do a check for 28VDC at EIU 2 (1KS2) pin AC/9 (Ref. ASM 73-25/05).
 (a) If there is 28VDC:

 - do a check for open or short to ground at the harness J2 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/2 to pin J2/13. Replace the harness J2 if necessary.

 (b) If there is no 28VDC:

 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).

 - do a check for open or short to ground at the aircraft wiring between the circuit breaker (4KS2) and EIU 2 (1KS2) pin AC/9.
 1 If there is a short to ground:
_
 - repair the above wiring. 2 If there is no short to ground:
_ - replace the C/B-ENGINE/ENG 2/FADEC B (4KS2).
 (c) Make sure that 28VDC supplies the BUS 2 (Ref. ASM 73-25/05).
 C. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
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