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**ON A/C ALL
4. Fault Isolation
_______________
R **ON A/C 001-049, 056-056, 058-058, 061-099, 101-105, 151-199, 201-211,
A. This fault is generated if the ECU detects an open or short circuit on one or more alternator windings and N2 is greater than 58.8% (min idle).
NOTE : A possible cause of the message failure____ALT, J9, ECU may be the result of a short circuit through J9 wires which can produce an ECU power supply deterioration. The troubleshooting steps must be performed as specified hereunder.
(1) If the failure message ALT, J9, ECU is not confirmed:
- do a check of the AGB lubrication unit magnetic plug and screen for particles (Ref. AMM TASK 79-21-10-210-002).
(a) If particles are found:
- replace the AGB (Ref. AMM TASK 72-63-00-000-003) and (Ref. AMM TASK 72-63-00-400-003).
1 Inspect alternator stator and rotor for contact, replace as
_ required (Ref. AMM TASK 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
(b) If no particles are found:
- no further maintenance action is required.
(2) If the failure message ALT, J9, ECU is not confirmed but is repetitive:
- disconnect the HJ9 harness from the alternator stator.
(a) Visually examine the alternator stator receptacle and the HJ9 harness connector for damaged pins or contamination, and the 90. elbow of the harness boot for evidence of overheat (Ref. AMM TASK 73-21-50-210-002).
1 If harness or alternator stator connector is damaged:
_ - repair or replace as required.
2 If no damage is found:
_
- remove the alternator stator (Ref. AMM TASK 73-21-30-000-001).
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(b) Visually examine the alternator stator and rotor for evidence of contact.
1 If evidence of contact is found, the cause must be determined:
_
- inspect the alternator rotor nut for proper installation, inspect the AGB lubrication unit magnetic plug and screen for particles (Ref. AMM TASK 79-21-10-210-002).
a If chips are found on the chip detector:
_
- replace the AGB (Ref. AMM TASK 72-63-00-000-003) and (Ref. AMM TASK 72-63-00-400-003).
b If rubbing is found and chips were not found on the chip
_
detector:
- replace the alternator rotor and stator (Ref. AMM TASK 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
c If no rubbing is noted:
_
- reinstall the alternator stator (Ref. AMM TASK 73-21-30-400-001).
(c) Replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
1 If fault continues during the subsequent flights:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(3) If the failure message ALT, J9, ECU is confirmed:
- disconnect the HJ9 harness from the alternator stator (ALT-A) (located in the left core compartment).
(a) Visually examine the alternator stator receptacle and the HJ9 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
1 If harness or alternator stator connector is damaged:
_ - repair or replace as required.
2 If no damage is found:
_
- do an electrical resistance test through the alternator stator connector 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 out of the specified limits:
_
- replace the alternator stator (Ref. AMM TASK 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
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本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机指示(146)
