- 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 above 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:
_
- 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 77-00-00-810-884
Loss of the Channels A and B of the FADEC on Engine 2
1. Possible Causes
_______________
- EIU-2 (1KS2)
- ECU (4000KS)
- harnesses J1 and J2
- aircraft wirings
- C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2)
- C/B-ENGINE/ENG2/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 2A and 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 -------------------------------------------------------------------------------49VU ENGINE/2/FADEC A/AND EIU 2 2KS2 A05 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 FAULT and the test of the FADEC 2A and 2B gives no maintenance message:
- disconnect the connectors J1 and J2 from the ECU (4000KS) and do a check for 28VDC at pins J1 and 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) pins AC/9, 11 (Ref. ASM 73-25/05).
(a) If there is 28VDC:
- do a check for open or short to ground at the harnesses J1 and J2 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/7 to pin J1/13 and pin AC/2 to pin J2/13. Replace the harness J1 or J2 if necessary.
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