Question about 2001 Jeep Grand Cherokee

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

When switching buttons for four wheel drive,transfer case engages and drive shaft from case to front differential spins, but front wheels do not engage. Checked actuator and cable. Ok. When driving, hear whirring noise that was not there before. Feels like four wheel drive is still engaged when vehicle is supposed to be in 2 hi.

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  • Jeep Master
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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.

Posted on Mar 21, 2014

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Posted on Jan 02, 2017

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1 Answer

4wheeldrive wil not engage


Manuel engagement uses a vacuum switch on transfer case that provides vacuum to the actuator next to the battery. Electric types a transfer case motor engages the front drive shaft and a electric axle shift actuator is used to engage the axle shaft on passenger side of differential

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The single speed automatic transfer case system shifts automatically from rear wheel drive to four wheel drive when the transfer case shift control module (TCSCM) senses the difference in rotation speed of the front propeller shaft and the rear propeller shaft . Two vehicle speed sensors, one located at the rear output shaft area of the transfer case, and the other, located at the front output shaft area of the transfer case, send front and rear propeller shaft rotation speed information to the TCSCM.
When the front and rear output shaft rotations remain the same, the TCSCM sends pulse width modulation signals to the encoder/motor to keep the transfer case in rear wheel drive. When the front and rear output shafts rotations are different, the shift control module sends pulse width modulation signals to the encoder/motor to engage the transfer case into four wheel drive.
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When the transfer case is engaged into four wheel drive, a lamp indicator on the instrument cluster will light. The automatic transfer case system is completely automated, no transfer case control button switching system is required.

Do you know what DTC'S - diagnostic trouble code's are ?
Auto part stores can't read these , your best bet take it to a qualified repair shop . One that has the knowledge an diagnostic equipment .
DTC C0300 Rear Speed Sensor Malfunction
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DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
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DTC C0550 ECU Malfunction
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Without proper factory service an repair info. an diagnostic tools

Jan 08, 2018 | 1998 Oldsmobile Bravada

1 Answer

My 4 wheel drive will not engage and the 4 wheel drive service light does not come on. what could be the problem/


check your four wheel drive fuse.if its ok.check for vaccum to your transfer case switch if it is vaccum operated.if it is electrical check for b+ at the transfer case switch.if there ok check for b+ at the front axle acctuator.if its ok it is probably your transfer case module.

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1 Answer

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check the electric solenoid on the fly which diverts the vacuum to the front wheel to engage the drive shaft.Usually two solenoids located on the radiator panel.Check for broken vacuum hoses or leak

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1 Answer

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The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.

Jun 02, 2008 | 2001 Chevrolet Blazer

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