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4. Fault Isolation
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A. This fault message is generated when the ECU detects an unwanted closure of the inhibition relay 14KS2 or a short or short to ground in the harness J6 or in the thrust reverser harness or in the aircraft wiring.
CAUTION : MAKE SURE THAT THERE IS NO HYDRAULIC PRESSURE WHILE YOU DO THIS
_______ TEST. PUT A WARNING NOTICE IN THE COCKPIT TO TELL PERSONS NOT TO PRESSURIZE THE HYDRAULIC SYSTEMS.
(1) If the test gives the maintenance message J6, TR ACFT SW, ECU: - on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC
GND PWR/2 (7KS2) the ON legend comes on, R
- remove the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) from 188VU and do a check for 28VDC at pin A/X on the relay base (Ref. ASM 73-25/16).
(a) If there is 28VDC: R
- disconnect the connector E from the TCU2 (8KS2) and do a check for ground at pin E/C.
1 If there is ground:
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- replace the CTL UNIT-THROTTLE, ENG 2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
2 If there is no ground:
_ - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend goes off,
- remove the EIU2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and disconnect the connector E from the TCU2 (8KS2),
- do a check for a short to ground between (Ref. ASM 78-37/01), .the EIU2 (1KS2) pin AA/4C and the TCU2 (8KS2) pin E/C .the EIU2 (1KS2) pin AA/4A and the TCU2 (8KS2) pin E/C.
3 If there is a short to ground:
_ - repair as required.
4 If nothing is found:
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- replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
(b) If there is no 28VDC: - on the overhead panel 50VU, push the P/BSW-ENG/FADEC GND PWR/2
(7KS2) the ON legend goes off, R
- replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) on 188VU (Ref. ASM 73-25/16).
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1 If the fault continues:
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- disconnect the harness J6 from the ECU (4000KS),
- do a resistance check between: . pins 7 and 8 (>10 megohms) . pins 7 and 11 (>10 megohms) . pin 7 and the ground (>10 megohms).
a If there is an electrical short or a short to ground:
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- replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-044) and (Ref. AMM TASK 71-51-43-400-044) or repair the aircraft wiring to the relay 14KS2 (Ref. ASM 73-25/16).
2 If nothing is found:
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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).
R (2) If the test does not give the maintenance message J6, TR ACFT SW, R ECU:
- replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) on 188VU (Ref. ASM 73-25/16).
(a) 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).
(b) If the fault continues:
- replace the CTL UNIT-THROTTLE, ENG 2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
(c) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(d) If the fault continues:
R - do a check for a short to ground between (Ref. ASM 73-25/16): .the EIU2 (1KS2) pin AA/4C and the TCU2 (8KS2) pin E/C .the EIU2 (1KS2) pin AA/4A and the TCU2 (8KS2) pin E/C .the relay (14KS2) and its related wiring.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 动力装置 POWER PLANT(16)
