(a) If the resistance values are in the specified limits: - open the VSVs and make sure that they move freely.
(b) If the resistance values are out of the specified limits:
- disconnect the cable J7 from the HMU and do a check of the HMU resistance between: . pins 25 and 26 (17 to 23 Ohms).
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).
2 If the resistance values are out of the specified limits:
_ - replace the Hydromechanical Unit (HMU).
(3) If the resistance checks are correct and the VSVs move freely:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
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Failure of the VSV System on Engine 2
1. Possible Causes
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- harness J7
- Hydromechanical Unit (HMU)
- 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 73-21-50-400-040 Installation of the HJ7 Harness
R 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 R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring) ASM 73-25/18
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message VSV ACT, HMU:
- manually operate the VSV system and make sure that the system moves smoothly and freely.
(1) If the fault continues:
- do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the VSV torque-motor (Ref. ASM 73-25/18).
(2) If the fault continues:
- disconnect the cable J7 from the ECU and do a check of the ECU resistance between: . pins 25 and 26 (17 to 23 Ohms).
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(a) If the resistance values are in the specified limits: - open the VSVs and make sure that they move freely.
(b) If the resistance values are out of the specified limits:
- disconnect the cable J7 from the HMU and do a check of the HMU resistance between: . pins 25 and 26 (17 to 23 Ohms).
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).
2 If the resistance values are out of the specified limits:
_ - replace the Hydromechanical Unit (HMU).
(3) If the resistance checks are correct and the VSVs move freely:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
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Loss of the feedback Signal from the VSV through the two Channels on Engine 1
1. Possible Causes
_______________
- ECU (4000KS)
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