_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
d If the resistance values are in the specified limits:
_
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(4) If the failure message J8, HMU(VBV TM), ECU is confirmed:
(a) Disconnect the HJ8 harness from the ECU (4000KS) receptacle.
1 Visually examine the ECU (4000KS) receptacle and the HJ8
_ harness connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
b If no damage is found:
_
- do an electrical resistance test through the HJ8 harness between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 and the ground (> 10 megohms).
c 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).
d If the resistance values are out of the specified limits:
_
- reconnect the HJ8 harness to the ECU (4000KS).
(b) Disconnect the HJ8 harness from the HMU receptacle (HMU-B) (located in the left core compartment).
1 Visually examine the HJ8 harness connector and the HMU
_ receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or HMU receptacle is damaged:
_ - repair or replace as required.
b If no damage is found:
_
- do an electrical resistance test through 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 c If the resistance values are out of the specified limits:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
d If the resistance values are in the specified limits:
_
- replace the HJ8 harness (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(5) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are confirmed on both channel A and channel B:
- replace the ECU right away for dual channel fault (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001).
(a) If the fault continues:
- do the fault isolation given in Para.4.A.(3) and Para.4.A.(4).
B. Do the test given in Para. 3.A.
(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 73-29-00-810-864
Loss of the Feedback Signal from the FMV Resolver through the Channel A on Engine 1
1. Possible Causes
_______________
- Hydromechanical Unit (HMU)
- harness J7
- ECU (4000KS)
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 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-040 Installation of the HJ7 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 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 channel A FMV resolver signal is out of
____ range, invalid or the signal disagrees with channel B.
(1) If the test does not give the maintenance message J7, HMU(FMVRES), ECU:
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