(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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 TASK 75-32-00-810-802
 Failure of the VSV System on Engine 2
 1. Possible Causes
_______________
 - 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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 TASK 75-32-00-810-803
 Loss of the feedback Signal from the VSV through the two Channels on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)
　
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