(1) If the test does not give the maintenance message J7, HMU(FMV TM), ECU:
- No maintenance action is required.
(2) If the test does not give the maintenance message J7, HMU(FMV TM), ECU, but is 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).
1 If the fault continues during the subsequent flights:
_
- replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(3) If the test gives the maintenance message J7, HMU(FMV TM), ECU:
- Disconnect the J7 harness from the ECU (4000KS) receptacle and visually examine it and the J7 harness connector for damaged pins, contamination (Ref. AMM TASK 73-21-50-210-002).
(a) If damage on a connector is found:
- Replace or repair as required.
(b) If nothing is found:
- Do an electrical resistance test through the J7 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 J7 harness to the ECU (4000KS) receptacle, and continue the troubleshooting.
(c) Disconnect the J7 harness from the HMU receptacle (HMU-A) (located left hand core compartment), and visually examine the J7 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 J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
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).
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E 56 E E E a 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).
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).
B. Do the test given in Para. 3.A.(1).
(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 73-29-00-810-869
Loss of the FMV Torque Motor Control through the Channel B on Engine 1
1. Possible Causes
_______________
- ECU (4000KS)
- Hydromechanical Unit (HMU)
- 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 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses 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
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