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Vmax vboost not working

Hi, iv got 2 vboost units and 2 servo units none work iv tried testing the vboost units and im getting an earth and a constant live on 1st one and just an earth on 2nd one, both servos have no movement even when a direct live and earth from jump leads, i have to conclude they have burnt out, can you tell me which vboost you think is good? and where to go next please. ps the bike runs fine otherwise. thaks rob.

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  • paddyboots May 11, 2010

    Did you also check the 3rd wire into the Vboost for a good connection to coil 1, it needs to get a pulse from there to know what the engine rpm is? It may not be a faulty Vboost if its not getting a signal

  • Patrick Dennehy May 11, 2010

    Have you compared the resistance readings between the poles of one vboost compared to the other unit's reading between its poles? Just a thought... TT

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5 Suggested Answers

SOURCE: Basslink servo light constant on

defect age,short worn its time through had the same thing happen to mine,A SUGGESTION PUT A 25 AMP FUSE,AND PULL IN AND OUT THE GAIN TUG IT,IT SOMETIMES STICKS AND SHORTS YOUR UNIT OUT,GOOD LUCK

Posted on Sep 26, 2007

  • 1861 Answers

SOURCE: AC temperature

Servo motor? I disagree. Actually, there are 3 servo motors in the vehicle; an air inlet servo, an air mix servo, and an air outlet servo. None of which control the temperature.
The AC temp is controlled by a thermister in the cooler box/eveporator unit under the dash.

Posted on Sep 10, 2008

  • 1 Answer

SOURCE: Pajero 1993 3 door 2.8 turbo

IT SOUNDS LIKE YOUR VAC PUMP HAS FAILED IT SITS ON THE BACK OF THE ALT

Posted on Oct 08, 2008

  • 7 Answers

SOURCE: What plug goes where in

you havt to put the plug in the back of it and then putit in warter swicth th roster battery with plug dk

Posted on Dec 21, 2008

  • 1 Answer

SOURCE: fitted a new exhaust, removed the cable from the

yes the servo has to b in the original position before the cable removal

Posted on Mar 28, 2009

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first off what does that mean? 91 command trac system.
1: light dead in dash. ( means squat)
2: shift lever will not move. (i guess its ok)
3: tires actually do not turn on 4 ends of axles. (guess fails)

we cant guess, what tests fail, you must say.
do you have drive on the front prop shaft,
from transfer case to the front axle.?
91 books are hard to find, but alldata.com does cover it.
ever read the FSM or alldata.com its there.
my guess is you are saying the shift motor is dead/. that it?
this?



25543740-y0lpcx5ujcsqxilomiw3wt0j-2-0.jpg if yes, did you do the steps in the FSM book yet>? read it?

  1. Raise and support the vehicle safely.
  2. Disconnect the vacuum harness and connect a hand vacuum pump to the front port. Apply 15 in. Hg (381mm Hg) of vacuum to the front port and rotate the right front wheel to fully disengage axle shafts.
  3. The shift motor should maintain the vacuum applied to the front port for a minimum of 30 seconds. If the motor does not maintain the vacuum, replace it. If the motor does maintain vacuum go to Step 4.
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  6. Remove the cap from the port for the indicator lamp switch and determine if vacuum is present. If present, the shift motor is functioning properly. If not, proceed to Step 7.
  7. Apply 15 in. Hg (381mm Hg) of vacuum to the shift motor rear port. Rotate the right front wheel to engage the axle shafts. The axles must be completely engaged!
  8. Determine if vacuum is present at the port for the indicator lamp switch. If present, the shift motor is functioning properly. If not, replace the shift motor.
85357331.gif tests: this is just a vacuum servo , called a motor by jeep, its not a motor of any kind its a vacuum servo actuator.
it can be removed and bench tested, easy. just like all servos




25543740-y0lpcx5ujcsqxilomiw3wt0j-2-1.jpg

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Its a 1997 Vmax and just before the V boost starts or call it the pre boost the bike sputters or almost like a bad cylinder.But everything as far as most normal checks things seem fine. Compression on all...


Hi, Stevecruzin personally I believe you have an issue with the V-Boost black box or the servo motor otherwise the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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14. Fuel filter clogged.
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21. Valve springs floating, weak, or broken.
22. Damaged intake or exhaust valve.
23. Incompatible performance parts.
24. Control module may be in "LIMP" mode
25. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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