Question about 1999 Chevrolet Tracker

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4wd will not engage is the front axle acuator electric?

If so where is the fuse?

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The front wheel drive is engaged at the tranfer case by an electric motor driven mechanism.

Posted on Nov 19, 2008

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Chevy 2002 2500 series, 4x4 will not engage, when shifted into 4wd a kind of grinding noise comes from the front like gears are not meshing.


No hubs on 2002 Chevy 2500. I'd check the front axle actuator (engages front axle when 4WD is engaged). Belive it's on the passage side axle tube of front differential. Could be wrong, but that's what it sounds like. Or the front ring/pinion is shot. They don't turn when not in 4wd.

Apr 08, 2015 | Cars & Trucks

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2000 model F150 4wd. Issues with vacuum solenoids to control front diff. Tested so far, transfer case will lock in front drive shaft when 4WD is selected - front wheels still free. Applying vacuum to the...


replace the 4 wheel drive acuator if in 4wd with selector and the wheels are still free then the acuator is bad even tho you 12v the acuator may not be pulling back to lock in the hub for 4 wd. simply replace it as their is a small spring on the acuater that over time becomes week and can no longer hold the presure that is created when it activated.

Aug 01, 2011 | Ford F-150 Cars & Trucks

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I got a 96 chevy 4x4 and my front wheels aren't pulling. i replaced the acuator and still nothing. everything sounds like it is engaging but no turning of the front wheels. do 96 models have auto locking...


96 chevys have a ifs (independent front suspension) this give it more ground clearance but does not have lock out hubs, the cv axles go into the front differential an spin freely until you put it in 4wd, how this works is your transfercase spins the drive shaft that goes into the front differential an while you put it in 4wd it sends power to the actuator to lock the front differential. if your front end isnt pulling you either popped your 1 of your cv axles but if you did this you would know because it makes a very loud thunking noise while you're driving, my guess is you have a short thats not sending power to the actuator. check to see if the wiring harnesses are connected and check if the fuse that operates the 4wd in the cab of the truck is not blown. also actuators for these trucks are horrible they go out alot

Feb 11, 2011 | 1986 Chevrolet K1500

1 Answer

When put in 4 wheel drive the tranfer case engages but the front axle does not turn?


Check the 4WD fuse. They are also prone to bad front axle actuators. They are electrically controlled and sometimes too weak to engage axle shift fork. If fuse good check for power and ground to actuator, if good you'll need an actuator. They do have issues with the transfer case encoder motor, so make sure it actually engages as you said. Front driveshaft turning.

Jan 28, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

When shifting into four wheel drive the fuse blows


There are 2 switches (one on top of the transfer case left side above shifter) this then sends power to the electric actuator to engage the front axle. Quite often the actuator is internally shorted causing fuse to blow. I'm sorry I don't have a schematic in front of me. The second switch is on the front axle and will illuminate the 4wd light when engaged. It could be shorted but won't inhibit 4wd operation (its a separate circuit). Remove the connector at the front axle actuator and jumper it directly to battery (using a fused jumper). if it operates, and fuse doesn't blow, then you have a wire chaffed to ground. Most often its near the front axle harness that gets rubbed thru. If the fused jumper blows then obviously the actuator is no good. I hope this helps some.

Jan 26, 2011 | 1991 GMC Sierra

2 Answers

98 f150 won't engage in 4wd


For the 1998 MY the front axle uses a vacuum shift motor

Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

If the problem is with the front axle engagement, check that the shift motor is operational

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This is on the front axle. If it does not move, it could be a problem with the vacuum lines or the vacuum diaphragms.
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The vacuum should be applied to the pink line if you are in 2WD, and the blue line when in 4WD.

Obviously check the fuses if you have the ESOF versions, to make sure the transfer case shift motor is operational.

Aug 18, 2010 | 2004 Ford F150

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My 1988 chevy silverado blows the heater/ac fuse when engaging 4w


There is an electric actuator on the front axle that engages 4WD. This part commonly fails resulting in no 4WD. Unhook the electrical connector to this part and see if heater still blows fuses. If It does not blow the fuse, the problem is in the actuator. If it still blows the fuse then it could be in the wiring. Buy a repair manual and trace the wiring schematics.

Feb 02, 2010 | 1998 Chevrolet K1500

1 Answer

90 jeep cherokee 4 wd acuator is moving back and


first is it a vacuum actuator on the front axle and u may be losing the vacuum when u hit the gas pedal. so spend 15 dollars and get a vacuum test kit to check for any leak downs in any of the vacuum lines,it maybe time consuming but will be worth doing yourself before paying 6 hrs of labor to a shop to do it all

Jan 16, 2010 | 1999 Jeep Cherokee 4WD

1 Answer

Transfer case fuse blows when engaging four wheel drive.


Hello;
Sounds like yoou have a short either in the switch pod or in the 4wd electrics. Check for pinched wires or bare wires grounding out at the front axle and at the transfer case.
Thanks;
Rich
RPM Northwest

Jan 20, 2009 | 1996 Chevrolet Tahoe

1 Answer

Front axle acuator will not work


The brown wire you are talking about should have a whiteish colored plug. If you look very carefully at the junction box down below the dash, you should see a male terminal port to the right side of this junction box, it should have the abrieviation wht next to it. It is the switched power source, it comes from the 4x4 fuse in the upper fuse panel.

Dec 31, 2008 | 1995 Chevrolet K1500

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