4. Fault Isolation
_______________
A. Do the test given in Para. 3.A.(1).
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Loss of the VSV Torque Motor Control through the Channel A on Engine 1
1. Possible Causes
_______________
- ECU (4000KS)
- harness J7
- Hydromechanical Unit (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
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) 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. Test
(1) 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 J7, HMU(VSV TM), ECU:
- do a check for open or short to ground at pins J7/10, 25, 26 of the harness J7 between the ECU (4000KS) and the VSV torque motor in the HMU, (Ref. ASM 73-25/18).
(1) If the wiring is not correct:
- repair the above wiring.
(2) If the wiring is correct:
- disconnect the harness J7 from the ECU and do a check of the ECU cable resistance between: . pins 25 and 26 (17 to 23 Ohms) . pins 25 and 10 (> 10 Megohms) . pin 25 and the ground (> 10 Megohms).
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F 『 E C F M E E E E 56 E E E (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).
(b) If the resistance values are out of the specified limits:
- disconnect the harness J7 from the HMU and do a check of the HMU receptacle resistance between: . pins 25 and 26 (17 to 23 Ohms) . pins 25 and 10 (> 10 Megohms) . pin 25 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the 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 Hydromechanical Unit (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.(1).
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Loss of the VSV Torque Motor Control through the Channel B on Engine 1
1. Possible Causes
_______________
- ECU (4000KS)
- harness J8
- Hydromechanical Unit (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 73-21-50-000-041 Removal of the HJ8 Harness
AMM 73-21-50-400-041 Installation of the HJ8 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
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊(cè) 發(fā)動(dòng)機(jī)燃油和控制 2(136)
