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A. If the test gives the maintenance message BSV, J11/J12, ECU:
- do a check for open or short to ground of the harness J11 and J12 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the BSV pins J11 and J12/9, 23, 24 and pins CJ11L and CJ12L/1, 2 (Ref. ASM 73-25/18) (Ref. AWM 71-51-08).
(1) If the wiring is not correct:
- repair the above defective wiring.
(2) If the wiring is correct:
- disconnect the harness CJ11L and CJ12L from the BSV. Install a jumper wire between the pins 1 and 2 on the harness CJ11L and CJ12L.
- disconnect the connector J11 and J12 from the ECU 2 (4000KS) and do a check of the harness J11 and J12 resistance between: . pins 9 and 23 (< 5 Ohms) . pins 9 and 24 (> 10 Megohms) . pin 9 and the ground (> 10 Megohms).
(a) If the resistance values are in the specified limits:
- replace the burner staging valve (BSV) (Ref. AMM TASK 73-11-70-000-002) and (Ref. AMM TASK 73-11-70-400-002).
(b) If the resistance values are out of the specified limits:
- disconnect the harness J11 and J12 from the junction box at the 6 o'clock strut and do a check of the harness CJ11L and CJ12L resistance between: for the harness CJ11L . pins 8 and 10 (< 5 Ohms) . pins 8 and 9 (> 10 Megohms) . pin 8 and the ground (> 10 Megohms) for the harness CJ12L . pins 16 and 15 (< 5 Ohms) . pins 16 and 5 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms).
1_ If the resistance values are in the specified limits:
- replace the harness J11 (Ref. AMM TASK 73-21-50-000-044) and
(Ref. AMM TASK 73-21-50-400-044).
- replace the harness J12 (Ref. AMM TASK 73-21-50-000-045) and
(Ref. AMM TASK 73-21-50-400-045).
2_ If the resistance values are out of the specified limits:
- replace the harness CJ11L (Ref. AMM TASK 73-21-50-000-025)
and (Ref. AMM TASK 73-21-50-400-025).
- replace the harness CJ12L (Ref. AMM TASK 73-21-50-000-027)
and (Ref. AMM TASK 73-21-50-400-027).
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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).
B. Do the test given in Para. 3.A.
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TASK 73-10-00-810-813
Failure of the FRV of the Engine 1 in the Open Position, on Channel A
1. Possible Causes
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- harness J7
- fuel return valve
- ECU (4000KS)
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-00-00-710-002 Wet Motoring Check AMM 73-11-50-000-002 Removal of the Fuel Return Valve (FRV) AMM 73-11-50-400-002 Installation of the Fuel Return Valve AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-400-040 Installation of the HJ7 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)
ASM 73-25/18
3. Fault Confirmation
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A. Not applicable.
4. Fault Isolation
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A. The fault is generated when the fuel return valve fails to reach the R closed position when commanded by the ECU.
(1) Inspect the harness J7 and associated connector for sign of damage or contamination (Ref. ASM 73-25/18). Pay particular attention to pins 14 and 31 on the harness connector to the ECU and to pins 3 and 4 on the harness connector to the fuel return valve. Defective contacts on those connectors may give an erroneous indication of the fuel return valve position switches.
(2) If damage is found:
- replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(43)
