- 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
(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 2B 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 J8, HMU(LPTCTM), ECU:
- do a check for open or short to ground at pins J8/19, 38, 39 of the harness J8 between the ECU (4000KS) and the LPT torque-motor current 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 J8 from the ECU and do a check of the ECU cable resistance between: . pins 19 and 38 (17 to 23 Ohms) . pins 19 and 39 (> 10 Megohms) . pin 19 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 J8 from the HMU and do a check of the HMU receptacle resistance between: . pins 19 and 38 (17 to 23 Ohms) . pins 19 and 39 (> 10 Megohms) . pin 19 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
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 A on Engine 1 and Channel A on Engine 2
1. Possible Causes
_______________
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
73-29-00-810-884 Loss of the VSV Torque Motor Control through the
Channel A on Engine 1
73-29-00-810-886 Loss of the VSV Torque Motor Control through the
Channel A on Engine 2 AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 1A and 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 messages:
- J7, HMU (VSV TM), ECU on the channel 1A
and
- J7, HMU (VSV TM), ECU on the channel 2A
(1) Do the trouble shooting procedure (Ref. TASK 73-29-00-810-884).
(2) Do the trouble shooting procedure (Ref. TASK 73-29-00-810-886).
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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 2(145)
