4. Fault Isolation
_______________
A. If the test gives the maintenance message J3 (INSTINCT DISC):
- do a check for loose J3 connector at the ECU 2 (Ref. ASM 73-25/12).
(1) If the fault continues:
- make sure that the pins are not bent and that the pins and sockets have not moved into the J3 ECU 2 connector (Ref. ASM 73-25/12).
(2) If the fault continues:
- do a check for open circuit in the harness J3 between the pins J3/6, 31 (Ref. ASM 73-25/12).
(a) If the fault continues:
- replace the 5CA1
- replace the 5CA2
- replace the harness J3.
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ECES E 56 E E E (b) If there is no fault:
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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. Do the test given in Para. 3.A.
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ECES TASK 73-29-00-810-850
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Loss of the HPTC Torque Motor Control through the two Channels on Engine 1
1. Possible Causes_______________
- ECU (4000KS)
- harness J7
- harness J8
- Hydromechanical Unit (HMU)
2. Job Set-up Information______________________
A. Referenced Information
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REFERENCE DESIGNATION
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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 73-21-50-400-040 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)(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 and 1B 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 (HPTCTM), ECU + J8, HMU (HPTCTM), ECU:
- do a check for open or short to ground at pins J7/10, 23, 24 and J8/10, 23, 24 of the harnesses J7 and J8 between the ECU (4000KS) and the HPT torque-motor current in the HMU, (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective harness J7 or J8.
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ECES E 56 E E E (2) If these wirings are correct:
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- disconnect the harnesses J7 and J8 from the ECU and do a check of the ECU cable resistance between: . pins 23 and 24 (17 to 23 Ohms) . pins 23 and 10 (> 10 Megohms) . pin 23 and the ground (> 10 Megohms).
(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 harnesses J7 and J8 from the HMU and do a check of the HMU receptacle resistance between: . pins 23 and 24 (17 to 23 Ohms) . pins 23 and 10 (> 10 Megohms) . pin 23 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(103)
