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Speedometer does not work changed the vss still does not work. 1991 s10 blazer 2 wheel drive

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Sounds as if the Head Unit is Faulty

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Speedometer won't work in 97 Astro, replaced sensor..help


What sensor ? VSS - vehicle speed sensor on the transmission ? Colud be the speedometer gauge is bad . Do you know how the insturment cluster get's that info. ? Your best bet , take it to a qualified repair shop . You have no idea how it works , don't have the diagnostic tool's to find the problem ,so do yourself a favor . The first step would be to hook up a factory or professional type scan tool to see if the VSS info is seen in the VCM ,then to see what the VCM is sending over the serial data network . Do you know what a serial data communication network is ? VCM is vehicle control module .
Speedometer and Odometer Circuit Description
An electronic speedometer is standard equipment on all models. Integrated circuits control the air core speedometer and the stepper motor odometer. Removable bulb and socket assemblies provide the lighting. The socket assembly inserts into the back of the instrument cluster.
The speedometer system consists of the following components:
• The instrument cluster
• The vehicle speed sensor (VSS) calibrator
• The VSS
• The related wiring
The VSS calibration is part of the VCM that changes the analog output from the VSS to a digital signal. The digital signal contains 4000 pulses per mile (PPM) for the instrument cluster. The VCM sends the signal to the speedometer through CKT 389. The VSS calibration matches to the final drive and the tire size of each vehicle. Reprogram the VCM with the proper VSS calibration if the final drive or tire size changes for any reason. The signal will not be accurate for the proper speedometer/odometer operation if the necessary change is not made. An incorrect VSS calibrator can also affect the following components:
• The antilock brakes
• The vehicle control module (VCM)
The cruise control systems
The VSS calibration is programmed into the VCM. Do not service the VSS calibrator separately.
The VSS is a permanent magnet signal generator that sends an analog signal proportional to the propeller shaft speed to the VCM. The VSS mounts to the transmission tailshaft extension housing on the two-wheel drive model. The VSS mounts to the transfer case output shaft housing on the all-wheel drive models.


Use a Scan Tool in order to read the vehicle control module (VCM) diagnostic trouble codes.
Are there any vehicle speed sensor related trouble codes?
Testing an not guessing fixes problems

Sep 19, 2017 | 1997 Chevrolet Astro

1 Answer

94 Chevy s10 blazer tahoe lt. Automatic transmission. The speedometer quits at 50 miles an hour. Then that night gears won't shift. Fluid is black. The truck was given to me. Is the transmission done? Or...


The speedo problem is probably the VSS. The shifting problem could also be a VSS problem, but the black trans fluid is not good either.
I don't recommend changing fluid after 125,000 miles if it has never been changed since new, but in your case you may not have much to loose if you do.

Oct 17, 2014 | Cars & Trucks

1 Answer

My speedometer isnt give a accurate reading, my cruise control stopped working and it seems my transmission isnt shifting correct. I changed my vss on the tranny and it started working then i started...


Check and see if you have proper tire size on all 4 wheels. Sometimes mismatched sizes can cause speedo issues. Possible abs or wheel speed sensor issue also.

Dec 14, 2012 | Cars & Trucks

1 Answer

HOW TO REMOVE STEERING WHEEL ON A 1991 S10 PU 2 WHEEL DRIVE TO GET TO COLUMN MOUNTED WIPER SWITCH


the wiper switch just pulls out with a little force you only need to pull the steering wheel if you are removing the turn signal switch.

Jan 03, 2011 | 1991 Chevrolet S-10 Blazer

1 Answer

How do you put a new speedometer cable in an 1991 s10 blazer


1991 Blazer/Jimmy didn't have a speedo cable, they converted to vehicle speed sensor (VSS) and digital ratio adapter connector (DRAC)

Apr 23, 2010 | 1991 Chevrolet S-10 Blazer

1 Answer

Bad VSS and rough idle related?


Yes they are related. ECM takes speed reading and makes engine timing and other engine performance changes.Change the sensor and you'll be happy again. sensors are pretty pricey

Mar 13, 2010 | 1991 Honda Accord

1 Answer

1991 S10 blazer 4x4 4.3 popping coming from the front


the popping sound is the stabilizer links or the lower control arm bushings you can replace all bushings and both link kits for around 50.00 and the light is prob from the sensor on the transfer case or the front end i would remove and clean with dawn dishwashing liquid and put them back.

Jun 23, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

Drive piece not spinning VSS pin to make speedometer work


yeah it can be replaced try a junkyard first.you might be able to get away cheap.i had the same problem in a 93 accord got mine from junkyard worked great after that

Jan 15, 2009 | 1991 Honda Accord

1 Answer

Wont go into 4 wheel drive


For you to switch this vehicle from 4 wheel to 2 wheel or 2 to 4. You should follow these steps. TURN VEHICLE ON, PUSH ON BRAKE PUT VEHICLE IN NEUTRAL.STILL HOLDING BRAKE AND VEHICLE IN NEUTRAL PUT VEHICLE IN 4 wheel or 2 wheel if desired. IT SHOULD WORK. Good Luck

Dec 29, 2008 | 1991 Chevrolet S-10 Blazer

1 Answer

1989 S-10 Pick-up


well does it light up? if its an 89 I don't remember there being a digital offered
but the VSS (vehicle speed sensor) controls the speedometer its located on the transmission if its a 2 wheel drive and on the transfer if its a 4 wheel drive a scan tool (not a code reader) is your best tool to help you diagnose this one to see if the VSS is producing a signal to the Speedometer unit

Sep 01, 2008 | 1998 Chevrolet S-10 Pickup

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