(2) If the circuit breaker (4KS2) is open, refer to Para. 4.A.(2).
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A. If the test gives the maintenance message EIU - 28V, ECU:
- do a check of the status of the circuit breaker (4KS2).
(1) If the circuit breaker is closed:
- 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) (Ref. ASM 73-25/05).
(a) If there is 28VDC:
- replace the EIU-2 (1KS2) (the most possible failure is the EIU 28V relay) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)
- replace the ECU (4000KS) (the most possible failure is an ECU diode) (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/9 (Ref. ASM 73-25/05).
1_ If there is no 28VDC:
- do a check for open or short to ground at the aircraft
wiring from the circuit breaker (4KS2) to EIU 2 (1KS2) pins
AC/9.
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).
2 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 (Ref. ASM 73-25/05).
3 If the fault continues:
_
- make sure that there is no ground signal at EIU 2 (1KS2) pin AA/5B (Ref. ASM 73-25/08).
(c) 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).
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- close the circuit breaker.
(a) If the circuit breaker trips:
- replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(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).
B. Do the test given in Para. 3.B.
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TASK 73-25-00-810-948
Loss of 28VDC Power Supply of the ECU on the Engine 1
1. Possible Causes
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發(fā)動機燃油和控制 2(81)
