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B. If the fault symptom is identified by the upper ECAM warning ENG1 FADEC FAULT and the test of the FADEC 1A and 1B gives no manitenance 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 1 (1KS1) 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 1 (1KS1) 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.
1 If the fault continues:
_
- make sure that there is no ground signal at EIU 1 (1KS1) pin AA/5B (Ref. ASM 73-25/08).
2 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).
(b) If there is no 28VDC:
- do a check for open or short to ground at the aircraft wirings between the circuit breakers (2KS1), (4KS1) and EIU 1 (1KS1) 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/1/FADEC A/AND EIU 1 (2KS1) or the C/B-ENGINE/ENG1/FADEC B/AND EIU 1(4KS1).
(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 77-00-00-810-883
Loss of the Channels A and B of the FADEC on Engine 1
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 1A and 1B 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 ENG1 FADEC FAULT
- no CFDS maintenance message after the test of the FADEC 1A and 1B 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發動機指示(101)
