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(b) If nothing is found:
- Do an electrical resistance test through the J8 harness between: . pins 27 and 28 (17 to 23 Ohms) . pins 27 and 12 (> 10 Megohms) . pin 27 and the ground (> 10 Megohms).
1 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).
2 If the resistance values are out of the specified limits:
_
- Reconnect the J8 harness to the ECU (4000KS) receptacle, and continue the troubleshooting.
(c) Disconnect the J8 harness from the HMU receptacle (located left hand core compartment), and visually examine the J8 harness connector and the HMU receptacle for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
1 If damage on a connector is found:
_ - Replace or repair as required.
2 If fuel wetting is found:
_
- replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
3 If nothing is found:
_
- Do an electrical resistance test on 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).
a 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).
b 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).
(5) If the test gives the maintenance messages J7, HMU (FMV TM), ECU + J8, HMU (FMV TM), ECU (on both channel A and B):
- replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(a) If the fault repeat:
- Do the troubleshooting described on steps 4.A.(3) and 4.A.(4).
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(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 73-29-00-810-857
Loss of the FMV Torque Motor Control through the Two Channels on Engine 2
1. Possible Causes
_______________
- ECU (4000KS)
- Hydromechanical Unit (HMU)
- harness J7
- harness J8
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 73-21-50-210-002 Visual Inspection of the Wiring Harnesses 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 non Motoring)
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 1A and 1B on the ground (with engine non - motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. Do this procedure:
NOTE : This fault is generated if there is an open or short to ground in
____ the torque motor current loop on both channel A and B.
(1) If the test does not give the maintenance messages J7, HMU(FMV TM), ECU and J8, HMU(FMV TM), ECU:
(a) If ECAM Warning ENG1 FUEL CTL FAULT was diplayed:
- 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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