- harness J7
- HMU
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
AMM 73-21-50-000-040 Removal of the HJ7 Harness
AMM 73-21-50-400-040 Installation of the HJ7 Harness
R 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 R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 1A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message HMU (FMV):
- do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the hydromechanical unit (HMU) pins J7/27, 28 (Ref. ASM 73-25/18).
(1) If the wiring is not correct:
- repair the above defective wiring.
(2) If the wiring is correct:
- disconnect the cable J7 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 27 and 28 (17 to 23 Ohms).
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E E 56 E E E (a) If the resistance values are in the specified limits:
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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) If the resistance values are out of the specified limits:
- disconnect the cable J7 from the HMU and do a resistance check of the HMU between: . pins 27 and 28 (17 to 23 Ohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
2 If the resistance values are out of the specified limits:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
B. Do the test given in Para. 3.A.
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TASK 73-10-00-810-802
Failure of the HMU Fuel Metering Valve on Engine 2
1. Possible Causes
_______________
- ECU (4000KS)
- harness J7
- HMU
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU)
AMM 73-21-50-000-040 Removal of the HJ7 Harness
AMM 73-21-50-400-040 Installation of the HJ7 Harness
R 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 R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message HMU (FMV):
- do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the hydromechanical unit (HMU) pins J7/27, 28 (Ref. ASM 73-25/18).
(1) If the wiring is not correct:
- repair the above defective wiring.
(2) If the wiring is correct:
- disconnect the cable J7 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 27 and 28 (17 to 23 Ohms).
(a) If the resistance values are in the specified limits:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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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(38)
