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- disconnect the connector J8 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 6 and 7 (26 to 36 ohms) (Ref. ASM 73-25/18).
(1) 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).
(2) If the resistance values are out of the specified limits:
- disconnect the harness J8 from the HMU and do a check of the HMU resistance between: . pins 6 and 7 (26 to 36 ohms).
(a) If the resistance values are in the specified limits:
- replace the defective harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(b) If the resistance values are out of the specified limits:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues after the replacement of the BSV and the harness J8 and if the resistance checks are correct, the cause of the fault can be the hydraulic pressure control:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) 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).
B. If the test gives the maintenance message BSV (VLV OPEN), HMU: R
- disconnect the connector J8 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 6 and 7 (26 to 36 ohms) (Ref. ASM 73-25/18).
(1) 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).
(2) If the resistance values are out of the specified limits:
- disconnect the harness J8 from the HMU and do a check of the HMU resistance between: . pins 6 and 7 (26 to 36 ohms).
(a) If the resistance values are in the specified limits:
- replace the defective harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
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(b) If the resistance values are out of the specified limits:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues after the replacement of the BSV and the harness J8 and if the resistance checks are correct, the cause of the fault can be the hydraulic pressure control:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) 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).
C. Do the test given in Para. 3.A.
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TASK 73-10-00-810-834
Failure of the BSV Valve on Engine 2
1. Possible Causes
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- burner staging valve (BSV)
- harness J8
- Hydromechanical Unit (HMU)
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
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AMM 72-41-00-290-001 Borescope Inspection of the Combustion Chamber Liners, Dome Areas,High Pressure Turbine Nozzle Vanes and Shrouds (as far as visible through two opposite ports)
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本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(53)
