- replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(c) If nothing is found:
- Do an electrical resistance test through the HMU receptacle between: . pins 16 and 34 (34 to 46 or 85 to 150 Ohms) . pins 35 and 36 (21 to 29 or 44 to 76 Ohms) . pins 18 and 37 (21 to 29 or 44 to 76 Ohms) . pins 16 and 17 (> 10 Megohms) . pins 35 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms) . pin 35 and the ground (> 10 Megohms) . pin 18 and the ground (> 10 Megohms).
1 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).
2 If the resistance values are in the specified limits:
_
- reconnect the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041) and continue the troubleshooting.
(d) Disconnect the J8 harness from the ECU (4000KS) receptacle and visually examine the J8 harness connector and the ECU (4000KS) receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-002).
1 If damage on a connector is found:
_ - replace or repair as required.
2 If nothing is found:
_
- Do an electrical resistance test through the J8 harness between: . pins 16 and 34 (34 to 46 or 85 to 150 Ohms)
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E E . pins 35 and 36 (21 to 29 or 44 to 76 Ohms) . pins 18 and 37 (21 to 29 or 44 to 76 Ohms) . pins 16 and 17 (> 10 Megohms) . pins 35 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms) . pin 35 and the ground (> 10 Megohms) . pin 18 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:
_
- replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(5) If the test gives the maintenance messages J7, HMU (FMVRES), ECU + J8, HMU (FMVRES), ECU (confirmed on both channel A and B):
- replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002) right away for dual channel fault.
(a) If the fault messages repeat:
- Do the troubleshooting per steps 4.A.(3) and 4.A.(4).
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 73-29-00-810-856
Loss of the FMV Torque Motor Control through the Two Channels on Engine 1
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
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