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- disconnect the harnesses J7 and J8 from the ECU and do a check of the ECU cable resistance between: . pins 6 and 7 (26 to 36 Ohms) . pins 6 and 39 (> 10 Megohms) . pin 6 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 6 and 7 (26 to 36 Ohms) . pins 6 and 39 (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or the defective harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
2 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).
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Loss of the Feedback Signal from the FMV Resolver through the Two Channels on Engine 1
1. Possible Causes
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- Hydromechanical Unit (HMU)
- harness J7
- harness J8
- ECU (4000KS)
2. Job Set-up Information
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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
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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).
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4. Fault Isolation
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A. Do this procedure:
NOTE : This fault is generated if one or both FMV resolver signals are
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out of range, invalid or the signals disagree.
(1) If the test does not give the maintenance messages J7, HMU (FMVRES), ECU + J8, HMU (FMVRES), ECU:
- replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
- Visually examine the HMU receptacle and the J7 and J8 harness connectors for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
(a) If damage on a connector is found:
- replace or repair as required.
(b) If fuel wetting is found:
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