schematics and diagrams: car shifting problem

Showing posts with label car shifting problem. 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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· Car automatically switches to 4wd low?

Wednesday, June 6, 2012

1998 Ford Expedition: Will not Shift Out of Park?

The Shifter will not release out of park mode.Vehicle stuck up in park and not move to drive mode or go to reverse.

First the few basics needs to be inspected.

When the shifter will not release from Park, first- Check your rear brake lights and see if they are working when you step on the brake pedal.

If the brake lights are NOT working, check your fuses.
Now if the fuses are good, and still no brake lights, the problem will be the Brake Light Switch.
The switch is located at the top of the brake peal arm.
See the Exact location diagram of Brake light Switch shown below:----

This switch controls the rear brake lights, and also sends a signal to the Shift Interlock telling it to release when the brake pedal is depressed. Inspect the electrical connector for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the switch will solve your problems.

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The above mentioned in one possibility.But now think other way.
If the brake lights ARE working,then in that case the problem will be in the Shift Interlock system. Very commonly, this a Shift Interlock Solenoid problem. This solenoid is located on the steering column.
First Inspect the electrical connector for any loose, broken or damaged wires. If the visual inspection checks ok, suspect a faulty solenoid.

See below the exact location diagram for faulty part:----

This details will help.
Thanks.

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Monday, December 5, 2011

Buick Park Avenue:Transmission will shift into drive?

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.

This problems are very much noticed in cars,that tranny/transmission will not shift to drive mode or 3rd gear,but will shift to reverse,2nd gear and first gear.
Mostly your problem indicates towards this issue.The transmission in this car is shifted by electric solenoids and they are controlled by a computer, so the very 1st thing that must be done here to start the diagnostic check of the cause is to have the computer scanned for fault codes related to the transmission, you could just have a defective shift solenoid. Aamco Transmission shops will scan the system computer for free and give you a free preliminary diagnosis of what might be needed to repair your shifting problems.

This details will help.Thanks.

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