4x4 ? - Team Camaro Tech
Non-Camaro Tech Problems and Issues with your daily driver or other non-Camaro vehicles.

 
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post #1 of 4 (permalink) Old Jul 20th, 12, 10:59 AM Thread Starter
Senior Tech
kevin
 
Join Date: Mar 2012
Location: virginia
Posts: 3,607
4x4 ?

i know this dont pretain to a camaro, but i know some of you guys work on other vehicles, and i need help
i have a 05 gmc envoy. it has a select knob for 2wd, all wd, 4 wd and 4 low.
when i shift the knob from 2 to all or 4 hi. it will not engage. if i put the transmission in neutral and shift to low it will engage
i may mention the first 3 are shift on the move
would this be the switch in the dash or the actuator switch on the front differential?
flat tire is online now  
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post #2 of 4 (permalink) Old Jul 20th, 12, 12:17 PM
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Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,727
Smile Re: 4x4 ?

Does that say Auto where you say it says all wheel drive ? I ask because on the older 2002 or so pickups had a part on the transfer case that was fairly common to fail and gives the symptoms you describe. Sorry, so vague on what the part is !

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 4 (permalink) Old Jul 20th, 12, 12:30 PM Thread Starter
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kevin
 
Join Date: Mar 2012
Location: virginia
Posts: 3,607
Re: 4x4 ?

Quote:
Originally Posted by TJS69 View Post
Does that say Auto where you say it says all wheel drive ? I ask because on the older 2002 or so pickups had a part on the transfer case that was fairly common to fail and gives the symptoms you describe. Sorry, so vague on what the part is !

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post #4 of 4 (permalink) Old Jul 20th, 12, 06:06 PM
Senior Tech
Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,727
Smile Re: 4x4 ?

I believe that A4WD stands for automatic four wheel drive.

I found some information for you :

During normal driving situations the transfer case can operate in the Auto 4WD mode. In the Auto 4WD mode the transfer case shift control module monitors rear wheel slip speed, based on the inputs from both the front and rear propshaft speed sensors. When the vehicle experiences a rear wheel slip condition, the transfer case shift control module sends a pulse width modulated (PWM) signal to an electronic motor, which is the transfer case encoder motor. This motor rotates the transfer case sector shaft, applying a clutch pack. This clutch pack is designed to deliver a variable amount of torque, normally delivered to the rear wheels, and transfers it to the front wheels. Torque is then ramped up to the front wheels until the front propshaft speed sensor matches that of the rear propshaft speed sensor. Torque is then ramped down until torque is completely removed from the front wheels or until rear wheel slip is once again detected. The process would then repeat.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1

Last edited by TJS69; Jul 20th, 12 at 06:30 PM.
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