Question about 1999 Chevrolet Silverado 1500

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4x4 wont engage front wheels

With engine off and keys forward in four hi cant turn front drive shaft , front differential actuator works checked power to connector on transfer case could not get a reading, will actuator still work even though transfer case motor might not, i can feel it shifting and light on dash comes on is there anything else i can check.

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  • curtis_be372 May 11, 2010

    do you have an automatic 4x4 button on your dash where it will automatically engage when it detects slipping?

  • Wayne Utt
    Wayne Utt Mar 03, 2014

    no 2 4 hi and 4 low

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  • Contributor
  • 19 Answers

Check switch or sensor on transfer case

Posted on Mar 07, 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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  12. tif.gif
  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

Is there an electric or vacuum switch on a 2001 chevy blazer


There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.

Mar 21, 2014 | 2001 Jeep Grand Cherokee

1 Answer

Why won't my front differential engage? 1988 Chevy


Ok I know this question is old but for any one else who has this problem, I want to clear some info up. GM did not use vacuum on the 4x4 systems on the full size series. Only used on the S series (S10, S Blazers). Here is how to accurately trouble shoot these problems with the full size 4x4. Remove the front actuator from the front axle ( keep it plugged up and let it hang). Put the T-Case in 4x4 Hi or Lo doesn't matter. Turn key on (don't start the engine) . Now check the actuator to see if it has extended. If (no) now check the plug to see if you have current . If you have current to the plug, change the actuator. Problem solved. If no current to the plug. Check for broken wires ( fix if any) If no broken wires. There is another switch on the T-Case that sends power to the actuator Replace it.. Back to the actuator.... If everything checked out and actuator works. With the T-Case locked in 4x4, try to turn the front drive shaft by hand. With the T-Case locked in 4x4 you shouldn't be able to turn the drive shaft. If drive shaft doesnt turn the T-Case is in good shape and the problem will be in the front differential. In these cases the most common problem is an exploded thrust washer. At this point the front differential needs to be rebuilt. Back to the T-Case..... With the T-Case locked in 4x4, if the drive shaft spins, the problem will be in the T-Case and at this point the T-Case will need rebuilt......... I hope you get the information you need to troubleshoot the GM 4x4 issues.

Feb 21, 2012 | 1988 Chevrolet K1500

1 Answer

When I engage the four wheel drive the transfer case shifts over like it should but it seems like the front differential is not fully locking. with the trucks on jackstands the front wheels will turn but...


there was a tsb on loss of 4x4 electrical A flashing 4X4 lamp and/or a intermittent or loss of power windows, interior lights, rear wiper, or 4x4 system. the loss of 4x4 system was from a module.

Feb 03, 2011 | 1998 GMC Jimmy

1 Answer

95 nissan 4x4 truck. four wheel drive light comes but does'nt en


the front axles have pinon gear box that the shaft from the transfer case goes to, it has a vacuum hose to it or a solenoid actuator check these for proper function this is how the power is turned on to the wheels.

Feb 13, 2010 | 1990 Nissan Hardbody King Cab

1 Answer

Have a 1993 f150 4x4 transfer case sounds like its engaging but there is a grinding noise when she goes in 4x4 only checked transfer case its fine could the hubs be gone over the summer with out use.


Try removing the front drive shaft from the transfer case to the front differential. With the vehicle on 4 jack stands and the front drive shaft removed attempt to place the vehicle into 4 WD. You may have to start the engine if the vehicle uses a vacuum actuator module to engage the front wheels. When you get an indication that the vehicle is in 4WD try turning the front wheels by hand and see it you hear the same grinding noise .... engage the hubs and try again. Usually if the transfer case is ok then the problem is in the front differential or one of the many universal joints that connect all of the elements together. Check the U joints on the front drive shaft for play as well as the U joints on each of the front wheels.

Dec 04, 2009 | 2000 Ford Excursion

1 Answer

I have a 1993 chevy 1/2 ton pickup with 5.7 liter and I cant get the four wheel drive to work when i put it into four whell the rear wheels alternate when slipping as they should but nothing from the front...


First of all try checking your fuse box and make sure the 4X4 fuse is still good. If the fuse is good, move the shift lever for the 4X4 on the floor into 4 high, then get a friend to watch underneath when you move the vehicle a little bit to see if the front driveshaft is turning. If the front shaft going to your differential is turning the problem is probably the electric actuator on the differential.

Dec 04, 2009 | 1993 Chevrolet K1500

1 Answer

4wd wont work on 1999 chevy tracker but front drive shaft is turning?


The locking hub control system is not engaging properly. On the 99 Tracker this is a compressed air system that consists of an air pump (compressor), electrical wiring to power and control the air pump, and air hoses that lead to an actuator inside the front differential housing. If there is a leak in the system the PCM will run the air pump for 10 seconds and then shut off, and your propeller shaft can turn all day long, but the front axles will remain free floating. Turn on your key, not your engine, and engage four wheel high. Go listen near the passenger front bumper for the air compressor. If you hear it, then the compressor control and the compressor itself are likely fine. If it shuts off after 10 secs or so, and your 4WD light isn’t on, the PCM timed out the compressor out and shut the compressor off to protect it. You will have to find the leak and fix it. If you are lucky, it’s the air line leading to the front differential; and not the air line inside the differential housing, or the air bladder in the locking actuator, which also resides inside the font diff. If the compressor shuts off and the 4WD light is on (this means the PCM did not shut the air compressor off due to timeout, so the pressure switch read 5-7 psi and the pump shut itself off), you likely don’t have a leak, and something mechanical has the actuator hung up inside the front differential. Lastly if you don't hear the compressor run at all, you either have a faulty compressor, or some sort of wiring problem in that circuit.....it could be as simple as a blown fuse. Good luck.

Apr 25, 2009 | Chevrolet Tracker Cars & Trucks

1 Answer

95 blazer 4x4 4 wheel drive not working


There is a vacuum actuator mounted on the front differential that locks the shafts to engage four wheel drive.

Jan 28, 2009 | 1995 Chevrolet Blazer

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