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 1 If the resistance values are in the specified limits:
_
 - replace the harness J12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
 2 If the resistance values are out of the specified limits:
_
 - disconnect the cable CJ12L from the VSV actuator and do a resistance check of the VSV actuator between: . pins 2 and 3 (400 to 600 Ohms) . pins 4 and 5 (100 to 180 Ohms) . pins 6 and 7 (100 to 180 Ohms) . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
 a If the resistance values are in the specified limits:
_
 - replace the harness CJ12L (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
 b If the resistance values are out of the specified limits:
_
 - replace the VSV actuator (Ref. AMM TASK 75-32-10-000-002) and (Ref. AMM TASK 75-32-10-400-002).
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R  B. If the test does not give the maintenance message VSV ACT, J12, ECU: 
R  - No maintenance action is required. 
R  C. Do the test given in Para. 3.A.

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 TASK 75-32-00-810-811
 Failure of the VSV System on Engine 1
 1. Possible Causes
_______________
 - harness J8

 - 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 73-21-50-000-041 Removal of the HJ8 Harness
 AMM 73-21-50-400-041 Installation of the HJ8 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 Motoring) ASM 73-25/18
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1B 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 J8 between the ECU (4000KS) and the VSV torque-motor (Ref. ASM 73-25/18).

 (2) If the fault continues:

 - disconnect the cable J8 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 J8 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 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).
 (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).
　
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