(2) Repeat the fault isolation procedure if the fault continues.
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TASK 73-29-00-810-863
Loss of the VBV Torque Motor Control - Engine 2 - Channel A and Channel B
1. Possible Causes
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- ECU (4000KS)
- Hydromechanical Unit (HMU)
- HJ7 harness
- HJ8 harness
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 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness AMM 73-21-50-400-040 Installation of the HJ7 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) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring)
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 2A and 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. This fault is generated if there is an open or short to ground in the VBV torque motor current loop on channel A.
(1) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are not confirmed:
- no maintenance action is required.
(2) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are not confirmed, but are repetitive:
- 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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F 『 E C F M E E E E 56 E E E (a) If the fault continues during the subsequent flights:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(b) If the fault continues during the subsequent flights:
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(3) If the failure message J7, HMU(VBV TM), ECU is confirmed:
(a) Disconnect the HJ7 harness from the ECU (4000KS) receptacle.
1 Visually examine the ECU (4000KS) receptacle and the HJ7
_ harness connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
b If no damage is found:
_
- do an electrical resistance test through the HJ7 harness between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 and the ground (> 10 megohms).
c 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).
d If the resistance values are out of the specified limits:
_
- reconnect the HJ7 harness to the ECU (4000KS).
(b) Disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment).
1 Visually examine the HJ7 harness connector and the HMU
_ receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or HMU receptacle is damaged:
_ - repair or replace as required.
b If no damage is found:
_
- do an electrical resistance test through the HMU receptacle between: . pins 27 and 28 (17 to 23 ohms) . pins 27 and 12 (> 10 megohms) . pin 27 and the ground (> 10 megohms).
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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(119)
