a Check for free rotation of the VBV gear motor. If it does
_ not move freely replace the VBV gear motor (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002).
b Check for free rotation of the stop mechanism. If it does
_ not move freely replace the VBV stop mechanism (Ref. AMM TASK 75-31-20-000-002) and (Ref. AMM TASK 75-31-20-400-002).
c Check for free rotation of the VBV master door actuator. If
_ it does not move freely replace the VBV master door actuator (Ref. AMM TASK 75-31-50-000-002) and (Ref. AMM TASK 75-31-50-400-002).
R 3_ Inspect the rod ends of the main flexible shaft (Ref. AMM TASK
R 75-31-30-200-002). Replace the main flexible shaft in case of excessive wear (Ref. AMM TASK 75-31-30-000-002) and (Ref. AMM TASK 75-31-30-400-002).
(b) If the system is not hard to rotate and moves freely and smoothly:
- disconnect the harness HJ8 from the ECU receptacle:
1 Visually examine the receptacle and connector for damage pin
_ or contamination (Ref. AMM TASK 73-21-50-210-002)
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E F 『 E C F M E E E E 56 E E E 2 Do an electrical resistance check through the J8 harness
_
between:
. pins 29 and 30 (17 to 23 Ohms).
a If the resistance values are in the specified limits:
_
- replace the VBV gear motor (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002).
- if the fault continues, replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
- If the fault continues, replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).
- 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 If the resistance values are out of the specified limits:
_
- disconnect the harness HJ8 from the HMU and visually examine the receptacle and connector for damage pin or contamination (Ref. AMM TASK 73-21-50-210-002)
- do a check of the HMU resistance between: . pins 29 and 30 (17 to 23 Ohms).
* If the resistance values are in the specified limits:
- replace the defective harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041) or
* 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).
C. Do the test given in Para. 3.A.
(1) If the fault is not confirmed:
- no additional maintenance action is required.
(2) If the fault continues:
- repeat the fault isolation procedure.
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Failure of the Control of the VBV Actuator on Engine 2
1. Possible Causes
_______________
- VBV ballscrew actuator
- flexible shaft
- VBV gear motor
- VBV stop mechanism
- VBV master door actuator
- main flexible shaft
- VBV sensor (RVDT)
- VBV Gear Motor
- ECU (4000KS)
- Hydromechanical Unit (HMU)
- harness HJ8
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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