schematics and diagrams: 4 wheel drive

Showing posts with label 4 wheel drive. Show all posts

Monday, November 19, 2012

Blazer won't shift into 4WD

Trail Blazer Wont Shift Into Four Wheel Drive

Try shifting from a stop, shifting when in neutral.

When the 4x4 does not work it sets a code and it's stored in the TCCM (transfer case control module) you need a shop with a tech 2 scanner to retrieve this code.
If you do have the (auto4hi) button, then you can only see codes with a scanner.

The other Blazer 4x4 system without the automatic t/case can be diagnosed without using a scanner.

Possibilities for the problem :----

If the lights flash when you try to engage auto 4hi or 4hi, but it won't complete the shift, then the problem is with the vacuum solenoid that engages the front diff.

The Vacuum solenoid details :-----

Its mounted to the firewall right above the distributor at the rear of the engine.

To confirm the issue with soledoind,these quick check will help.

You have to disconnect both vacuum hoses from the solenoid, verify there is vacuum on one
of them (engine running) and then manually stick them together and see if the 4x4 completes it's shift. If so, you most likely need a new solenoid.

If that is checked ok,then

Most likely problem is the encoder motor that's bolted on the T/CASE,,,

Also one more thing,are the on dash 4wd lights coming on when you switch from 4wd to 2wd hi and low.

If no lights on the switch, and the 4x4 fuses are good then you need a TCCM and it has to be programmed.

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When you try to switch on 4wd does it makes any clicking noise or no noise at all.

Is it trying to shift or no moment at all.

Suppose if its trying to shift this clears that the module and the switch are fine, you either have a damaged trasfercase or a damaged encoder motor.

BASIC DEFINITION FOR ENCODER MOTOR:----

Encoder motor is the electric motor that actually shifts the transfercase sometimes go bad, the best way to check for this would be to take the encoder motor off and shift he car from 2wd to 4wd hi and low and watch the motor turn, also when you take the motor off you can manually try to turn the transfer case selector shaft although its hard it can be turned using a wrench, if it turns ok then the encoder motor is damaged, if the encoder motor is also out of range the truck will do these things.

After you take the encoder motor out place the transfercase in 4wd hi and also put the switch on 4wd hi and try installing the encoder motor so that all falls in place, if there was some kind of misalignment between these two then the car does this exact thing yours is doing.

These details will help.

Thanks.

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http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

· Car automatically switches to 4wd low?

Wednesday, February 22, 2012

4WD light is flashing and beeping? NO 4WD high?

This problem is noticed on 2009 Toyota Tacoma.In this case the car will not go in 4WD high mode.
Also 4WD light is flashing and beeping on dash.

The most common problem or failure is usually related to the transfer case electrical actuator. The electric drive motor in the actuator gets stuck or bound up. This normally happens due to infrequency of use. If you have been using it regular it may have just failed. The tires need to be the same front to rear as far as wear goes. If this is a stick shift make sure the clutch pedal is touching the floor and there are no mats under it. The 4WD ecu has to see a clutch switch input. In order to replace this actuator the transfer case has to be removed from the transmission and disassembled. You cannot just unbolt and slide the arms or shift rails out of the transfer case. The transfer actuator assembly is about $1300 plus about six hours labor. In some rare cases I've been able to have someone push the actuator button while tapping on the actuator case with rubber mallet to try and launch the system or break it loose to allow it to shift into four-wheel-drive.

This details will help.

Thanks.

See below latest solved car problems

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http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

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Friday, December 2, 2011

Car will not go into 4WD high or 4WD low?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

Many car users notice this same problem.Mostly the 4wd indicator comes on dash,when it goes in 4WD high or low.
This light is turned on by the tranfercase control module.If the light is not on and you can't activate 4 high or 4 low then check the fuses first.If the fuses are good, get under the truck and tap on the transfer case motor while some pushes the 4 high button.If you dont hear any clicking from the motor then most likely the module is bad.And it has to be inspected and replaced.-------------
This basic details will help.Thanks.
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