Question about 1997 Ford Ranger SuperCab

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My speedometer is off. Have not changed tire size or gears, but just had my transmision rebuilt. I went ahead and chnaged the speed sensor, but it is still off.

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When you say you had yours rebuilt,did you get back your actual box or a rebuilt replacement.......see where im going.......

Posted on Oct 03, 2010

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2000 GMC Jimmy 4×4 The ABS light is on, the speed odometer does not work, and it does shift out of 1st gear, if I manually put it into second gear then it will shift fine, it has a changed VSS


Did you have it check for DTC'S - diagnostic trouble codes ?
Speedometer
The speedometer is an analog gauge that is located in the instrument cluster. The PCM/VCM receives an analog input from the vehicle speed sensor and converts it to a digital signal containing 4,000 pulses per mile (PPM) for the instrument cluster.
The PCM/VCM sends this digital output (4,000 PPM) to the instrument cluster on a designated circuit. These pulses can be measured in Hertz (Hz) using a digital multimeter (DMM) on the AC scale. The PCM/VCM calibration is matched to the final drive and tire size of each vehicle. If the final drive or tire size is changed for any reason, the PCM/VCM must be updated in order to match the new final drive or tire size. If not, the signal will not be accurate for proper speedometer/odometer operation. An incorrect signal can affect the antilock brakes and the cruise control systems.
The speedometer system consists of the instrument cluster, vehicle speed sensor (VSS), PCM/VCM and related wiring. The VSS is a permanent magnet signal generator that sends an analog signal proportional to the propeller shaft speed to the PCM/VCM. The VSS mounts to the transmission tailshaft extension housing on 2-wheel drive (2WD) models and the transfer case output shaft housing on 4-wheel drive (4WD) models.
Repairs to the instrument cluster can only be performed by an authorized instrument cluster service center. DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input and DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent in Automatic Transmission - 4L60-E
- DTC P0500 Vehicle Speed Sensor (VSS) Circuit in Engine Controls - 4.3L Important: If the instrument cluster is completely inoperative, refer to Instrument Cluster Inoperative .
Install a scan tool.
Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
Start the engine.
Place the transmission into drive for automatic transmission and third gear for manual transmission.
Compare the displayed vehicle speed on the Instrument Cluster with the monitored speed on the scan tool.
Does the vehicles speedometer and the scan tool both display 0 km/h (0 mph)? You really need a Factory scan tool or equivalent to check this . The VSS is an input to the PCM/VCM . engine computer . You can test with a DVOM - digital volt ohm meter , for signal to engine computer .
I know most people don't like hearing this , but I suggest you take it to a ASE certified repair facility .

Feb 21, 2016 | GMC Cars & Trucks

1 Answer

My speedometer runs 5 miles to fast


need correct tire size......over or under sized tires will cause change in speed reading.....

Aug 17, 2012 | 1996 Jeep Grand Cherokee

3 Answers

2003 GMC Yukon speedometer indicates less than actual speed by 30% - 60%.


Do you have after market tires that are larger than stock ? This will affect your speedometer.Another thing could be the speedometer gear which is easy and cheap. Its at the end of your speedometer cable inside of transfer case.

Jun 10, 2011 | 2003 GMC Yukon

2 Answers

I have a 92 GMC stepside and its lifted about 4.5 inches. I think its making my speedomiter be off. It says im going 50mph when i feel like im going 20mph. It also has a rebuilt motor and transmision....


If you have got taller tires on then what it came with from the factory it will definitly throw the speedometer off.You will need it to be recalibrated for a different speedometer gear put in the transmission.This will correct the odometer

May 04, 2011 | 1992 GMC Sierra

1 Answer

1998 chevy camaro speedometer is reading about double my actual speed i have a 3.8l v6


This usually only happens when you try running specialty tires on the vehicle which are smaller than the recommended size but can also happen if the speed gear in the transmission is damaged or worn or if the speedometer itself is malfunctioning. If your using the correct size tire on the vehicle the next step would be to check the speed sensor gear on the transmission. If that is good and not worn or damaged then replace the speedometer itself.

Feb 16, 2011 | 1998 Chevrolet Camaro

1 Answer

I have a 94 olds cutlass supreme the speedometer does not read right it is off if you are in town but on the highway it is farly right on what can i do to fix this


have you changed wheel size? if you changed your tire rim size,it throws the speedodometer off.in other words if you changed the 15inch rims to '18 inch or '20 inch rims you have thrown the speedometer off. because more wheel base is turning on the fround when the cars in motion. speeding tickets,yes! you're putting more wheel base on the road,which will increase the odometer speed as well as the cars. you may think you're doing 65mph with 15inch tires[good] but upsize your rims, you may be as much as 15miles or even 20 miles above the speed limit, or else if no rim change,have your transmission checked for bad speed sensor or the gear that runs the odometer is worn.thank you for choosing fixya.com

Jan 28, 2011 | 1994 Oldsmobile Cutlass Supreme

4 Answers

Do oversized tires alter the speedometer. The speedometer stated i was going 65 and the state police clocked me at 79 mph.


Most certainly does
You need a different gear in the trans or transfer case,that drives the speedo
Now if the speed sensor is the output,then you will need help. I personally do not know, if a scan tool can reprogram the ecm/bcm etc, to correct for the tire change.

Ask that question next.

Nov 05, 2010 | 2005 Chevrolet Silverado 1500 2WD

2 Answers

Is there anything I could do to bring my RPM's down when Im driving in hwy. I have a 96 t100 4x4 stick, stock. At 70mph rpm is at 3300. I changed to manual hubs and that helps a little.


The only way to accomplish that is to change the axle gear ratio. Trucks are generally geared for hauling, towing, plowing, etc, so you have more torque and power at lower speeds. If you change the axle ratio,your low end performance will probably suffer (sluggish acceleration at low speed). Basically, your T100 is not designed for 70mph highway driving.

Mar 23, 2010 | 1998 Toyota T100

3 Answers

Bigger tires...


Taller tire have more centrifugal force because they have more mass (weight). A body in motion tends to stay in motion. They also have a larger outer diameter therefore through all the weight to the out side of the tire. requiring more energy to accelerate and more energy to slow down than a smaller tire at the same speeds. This is why I would recommend up graded in your brakes and also lowering your gear ratio( numerically higher) if you are going to larger tires. A lower gear ratio will act as a torque multiplier which will get you moving faster up to speed and also adjust your speedometer to be more accurate.
When you go to larger tires your speedometer will be inaccurate because taller tire have large outer diameter. A taller outer diameter tire will travel farther per revolution than a smaller tire. This cause your engine speed to be lower with taller tires because your vehicles tires are moving slower do to it larger outer diameter.
There your vehicle can be re calibrated through the computer. 4wheel parts offers parts call true speed sensors which also recalibrate your speedometer accurately that is the way i would go. Also maybe up grade to larger master cylinder off a 1 ton Chevy and go with some drill and slotted rotors. You most likely will have better braking with these upgrades than you would stock. keep it safe!

Good luck and have fun.

May 10, 2009 | 1994 Chevrolet K2500

1 Answer

Speedometer error on 1993 Plymouth Voyager with 3.3L V6


Have you called transmission place? Did they also install it? Ask them if they changed speedometer adapter, and mention the difference in speed.

Jan 22, 2009 | 1997 Plymouth Voyager

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