Question about 2002 Chevrolet Trailblazer Ext

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4 wheel drive does not engage properly

When 4 wheel drive knob is actuated, it doesn't engage properly. Slips in and out. Sometimes backing up and then going forward will make it engage.

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  • nhcastle Jul 23, 2009

    No. Fluid is original(unless it is the same fluid as the transmission, which has been replaced.
    The issue is, the transfer case does not completely engage. It is like half-engaged & when accelerated, slips out & tries to engage again. Eventually, it may engage enough to stay in, but not at first. The light indicates that it is in 4 hi.

  • nhcastle Jul 23, 2009

    The car has done this, almost since new. We only use the 4WD a few times in the winter, if the driveway is too slipery. I can change the fluid, but I seriously doubt it will make any difference. It's like the engage mechanism, in the transfer case, does not go in far enough. I can hear the hubs engage, when the knob is turned. Are there sensors that limit the "throw" of the mechanism?

  • yadayada
    yadayada May 11, 2010

    has the fluid been changed in the transfer case

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It uses ATF but it is not part of the trans, have (it is easy) the transfer case fluid changed and get back to me, there is a drain plug and fill plug, it holds around 2 quarts, drain it and refill to just below the lip of the fill plug threads

Posted on Jul 23, 2009

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4x4 won;t ingage,2000 chevy tracker


Hi Wayne how's it going ? Here is a Transfer Case Circuit Description ! then I will get into some possibility's of what could be wrong !
There are two main components for the four wheel drive. The powertrain control module (PCM) and the front drive axle actuator pump. The pump is controlled by the PCM. The pump compresses air to engage the front axle. When the transfer case is in four wheel drive (4H or 4L), the four wheel drive switch closes providing a ground signal to the PCM. The PCM actuates the pump which pressurizes the actuator in the front axle. This pressure engages the axle hub which connects the front drive shaft to the axle shafts, allowing the transmission/transfer case to turn the front wheels. The PCM will not operate the pump for more than 10 seconds in order to protect it. The PCM will also provide a path to ground for the 4WD indicator in the instrument cluster. The indicator is provided battery voltage when the ignition switch is in the ON or START position through the IG fuse. With power and ground supplied, the indicator lights.
When the transfer case is in 4L (with auto trans), the four wheel drive low switch sends a ground signal to the PCM. The PCM will not engage the torque converter clutch while this signal is being received.
When the transfer case is returned to the two wheel drive mode, the release valve in the pump opens and releases the pressure in the actuator. Without pressure, the hub disengages.The PCM also releases the ground to the 4WD indicator which causes the indicator to turn off.
Does the four-wheel drive indicator light with 4x4 engaged ? DEFINITION: The 4WD indicator does not illuminate with 4WD engaged. All other engine and transmission functions are normal. Refer to: Electric Motor and Actuator Check in Driveline/Axle-Front Axle (w/diff).
The next step of testing the electric motor an actuator involve a lot of steps an a special tool -
J 43846 Actuator Pressure Gauge
This a factor diagnostic flow chart , I'm not familiar with the in's an out's of this system , the most probable thing's that go wrong with this system. If you want I can send you the diagnostic flow chart !
Electric Motor and Actuator Check
Tools Required J 43846 Actuator Pressure Gauge
  1. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. If the vehicle is equipped with an engine skid plate, remove the four bolts that hold the skid plate in place. Remove the front skid plate from the vehicle.
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  4. Install theJ 43846 with the air hose connecting between the air pump assembly and the front differential actuator.
  5. Tighten the adjusting knob as far as it stops.
  6. Important: Be careful not to bend any part of the hose.
  7. Turn on the ignition switch and shift transfer lever from 2H to 4H range.
  8. Make sure to check that the motor of the actuator starts running (a running sound can be heard) within 1 second and it stops when the actuator pressure gauge indicates specified pressure. Check for air leakage during the procedure. Pressure specification is: 38.0 kPa (5.40 -- 8.25 psi).
  9. Check that the pressure indicated on the gauge drops as soon as the transfer lever is shifted to the 2H position.
  10. Start the motor of the actuator pump by shifting the transfer lever to the 4H position again. Loosen the adjusting knob to lower the pressure on the gauge. The actuator motor should start to run again and stop in about 4 seconds.
  11. With the adjusting knob of the actuator pressure gauge loosened, shift the transfer shift lever to neutral or the 2H position and then 4L or 4H position. Pump motor should stop in about 10 seconds after the motor starts to run.
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  13. Disconnect the air hose (2) from the actuator pump assembly and connect it the front differential air hose inlet. Loosen the adjusting knob.
  14. Connect the air compressor air hose to the actuator pressure gauge.
  15. Compress air into the actuator pressure gauge and turn knob to obtain specified pressure. Specified pressure : 38.0 kPa (5.40 psi)
  16. While both wheels are lifted off the ground, turn one of the front wheels by hand and check the other wheel for the following:
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When applying pressure to the actuator pump the other front wheel should turn in the direction opposite to the wheel being turned by hand.


?€¢
When the actuator pump is not working (by not applying pressure) the other front wheel should remain stationary while the wheel turned by hand is turning.


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Install the actuator pressure gauge to the actuator pump assembly (1) .


?€¢
Install a voltmeter and the battery to the pump assembly (1) .


?€¢
Tighten the adjusting knob as far as it will stop and the air check side opening by a hose as a blind plug.


?€¢
Check that the actuator assembly motor starts to run (a running sound can be heard) when the battery is connected and when it stops when specified pressure is obtained. Specified pressure is: 38.0- 58.0 kPa (5.40 -- 8.25 psi).


?€¢
Ensure that the voltmeter is within specifications when the motor is running should be about 0v and when the motor has stopped it should be about 10 -- 14v
good luck !


Jan 27, 2015 | 2000 Chevrolet Tracker

1 Answer

Can the four wheel drive actuator freeze up and cause the four wheel drive to not engage ?


yes. sometimes not servicing the differential can cause the actuator to stick in position. either you can or cant put it in 4 wheel. you may have to replace the actuator and service the differential to cure this. hope this helps

Feb 04, 2011 | 2004 Nissan Titan

1 Answer

2001 2500 suburban , will not always engage into 4 wheel when button is pushed , nothing happens , then when it does sometimes it will not go back to 2 wheel drive .


There is an electrical conection called a servo and this might need to be replaced. It actuates the 4 wheel drive when the button is depressed

Feb 16, 2010 | 2004 Chevrolet Suburban

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Our Chevy S-10 ZR2 won't go into 4 wheel drive


under battery is a vacum operated actuator that pulls your 4 wheel drive in to front axle.Make sure it has vacum going to it .Sometimes the actuator will get a hole in the rubber housing and 4 wheel will not engage.You could also check your vacum lines going to a canister on drivers side fender as sometimes the will come un-pluged and your actuator under battery will get novacum to it.If not it could be your actuator motor which is on the transfer case and is electric controlled and expencive300-400 dollars.Also could be a vacum line

Jan 09, 2010 | 2001 Chevrolet S-10

1 Answer

When i engage four wheel drive from the lever in the car i only get traction on the rear wheels. Is there a diff lock i need to engage


It depends, look at the hubs on your front wheels? Is there a knob in the center of the wheels? If so, then turn this knob to the right and you will have engaged the 4 wheel drive? If you do this, however, make sure you engage the 4 wheel drive inside the truck (if your truck has a 4 wheel drive gear shifter).
Oh other Rangers you have a knob on the inside of the cab it should be somewhere on the dash. You can turn it to the right and this will engage the 4 wheel drive.
Finally, when you engage the 4WD make sure the engine is cut off so it doesn't mess up your transfer case.

Jan 08, 2010 | 2000 Kia Sportage

2 Answers

2000 blazer 4 wheel drive problem


It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.

Jan 05, 2010 | 2000 Chevrolet Blazer

1 Answer

Ford F150 lost 4 wheel drive 2003 FX4


Take the hubs apart, inspect them, and clean them, especially the one that you heard a clunk, something might have broke in the automatic hub lock. Make sure everthing gets put back exactly the same, or you'll have more problems. If that doesn't work, then there is something wrong somewhere in the transfer case.

Mar 15, 2009 | 1999 Ford F150 Regular Cab

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1990 Chevy 1500 4x4 won't engage 4 wheel drive


the 4x4 do not engage in my1990 chevy pick up what i need to check

Jan 24, 2009 | 1992 Chevrolet K1500

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Tranny slips


Tranny slippage can be caused by several things (each contributes to a varying degree, if at all)

1. cold parts are smaller > > > don't seal properly
2. cold fluid is more viscous > > > don't flow properly
3. bad fluid can cause build-up > > > slow actuators & clog fluid passages
4. worn parts > > > don't seal properly

Result: low fluid pressure pressing on bands/clutches = slippage

The good news: as everything warms up, tolerances normalize, system leaks seal & fluid flows more readily creating enough pressure to keep bands/clutches from slipping excessively (normal operation)

As for the 4WD not engaging, I would be willing to bet the front differential actuator is frozen/stuck (assuming it has worked recently)

Jan 15, 2009 | 2003 Chevrolet Tahoe

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