HOW IT WORKS The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a sine wave type waveform with a frequency that is proportional to the speed of the vehicle.It has a gear on it that meshes into either the transmission/transaxle or the differential (depending on the vehicle.Probably in the differential of a Ford Ranger) When the vehicle is moving slowly, the sensor produces a low frequency signal. As the vehicle speed increases, the sensor produces a higher frequency signal. This signal is sent to the PCM and is converted into a vehicle speed value, stored in RAM memory. The PCM utilizes this value to aid in controlling torque converter lock-up/transmission/transaxle shift points, control fuel injection, ignition timing and , coolant fan control, vehicle speed control, air/fuel ratio and ignition timing. MY OBERVATIONS AND COMMENTS It works like a little alternator of sorts, or probably more correctly like the rotor and pick-up in an electronic ignition system. When it is spinning with the transmission or differential gears it generates small electric pulses which are sent to the engine control computer. The faster it spins the higher the frequency. I have tested some of mine two different ways. One way is to remove it from the tailshaft of the transmission or the differential housing (depends on vehicle)and hook the two leads to a volt meter on the AC scale or if you have a digital meter with a frequency scale you can use that too. This will measure the frequency in HERTZ (Hz.),meaning cycles per second. Spin the little gear(probably nylon)as fast as you can by hand (drag your hand /arm across it real fast like you were winding up a toy car or top)and watch the voltmeter for a reading. If you get a reading ( a few volts or Hz.) it's probably still functioning. You could also turn the gear with a variable speed drill.Keep it slow to be on the safe side.I'm guessing under 1000 RPM (most variables top out at 1250rpm for 1/2" and 2250rpm for 3/8"). If it won't go in the drill chuck (some gears have a little nub on the end you can grab),then wrap the gear with some tape and press the gear onto the side of the chuck,sort of like a bicycle generator on a bike tire.The tape will protect the little gear and help increase the friction between the two so it spins easily. Another way is to leave the sensor in place, jack up the vehicle,drive wheels off the ground and turn the drive wheels by hand with your test apparatus hooked up to the leads on the sensor for similar results. The main thing is that you get varied voltages/frequencies at different speeds.If you get nothing it's busted. I DO NOT recommend that you run the vehicle while it is jacked up. Spinning the wheels by hand will tell you all you need to know. I don't know the exact voltage or frequency you should get because it's all based on how they designed the sensor, how they calibrated the computer,the gear ratios of the sensor to the transmission or differential, and how fast you spin it. If you get different voltage and/or frequency readings at different speeds,it's probably good. The resistance across the two terminals of the sensor for a 1993 Ford RANGER is supposed to be 190 to 250 OHMS. If the sensor checks out good ,you may have a problem in the connectors or wiring .Often a close visual inspection of the connectors and wiring will reveal the problem before you have to break out a meter and run continuity checks Also check out the condition of the gear on the sensor and make sure that it is not chewed up and is properly fixed to the shaft of the sensor and not spinning loose on the shaft. I tried the first method with the drill with a 1990 Nissan speed sensor and at approx 1000 RPM I got about 7 volts AC and 270 Hz. Also, the measured resistance across the two terminals of the sensor was 258 OHMS.
If the speedometer/odometer is working, chances are the VSS (Vehicle Speed Sensor) is good.
You gotta smack it with your shoe.
This code indicates a problem with the vehicle speed sensor. Check the wiring and if it is good replace the vehicle speed sensor.
if your code is po500 check the wires between speed sensor and cluster .mostlikely your problem is in the cluster
Replace the faulty speed sensor and the light will reset itself after a short drive.
Check out a good Public Library.
I started having tons of electrical problems and they told me it was a speed sensor. I. Would suggest you check for an oil leAk.
check for a faulty speed buffer module
Probably the wheel speed sensor. Check the connector. If connection is good then the sensor may have been damaged or it has failed.
Check the speed sensor on the top of the tranny. This will tend to build up with metal shavings and cause the sensor not to read the speed of the transmission.
if it's like my 2002 it has a service engine code light on with a speed sensor code.it doesn't have a speed sensor, it means you need to check plugs/wires/or the electronic assy.itself.my problem was the plugs.
Possible failure of the output/vehicle speed sensor.Possible failure of the output/vehicle speed sensor.
If it is bad the check engine light will come on and set a code for that particular sensor.
yes it can but also check the speed sensor if your vehicle is equiped with one.
did you check the speed sensor on the side of the transmission?
If your battery leak acid your speed sensor is dead. You need to replace by 89413-08020. Price average is $58.00 - $120.00 (original).
I have an 03 grand am gt, there is only one way to check out the speed sensor, bring it to a garage and have them scan it for you... this will get it correct.
The speed sensor is located behind the right side chrome cover on the engine. Where you check your oil. It's held on by one bolt.
Code 13 is no vehicle speed sensor signal. Check/replace the speed sensor on the tailshaft of the transfer case.
The speed sensor wire is connected to the speed sensor and goes to the speed sensor relay switch. The speed sensor relay switch is connected to the computer by a separate wire.
Input/Turbine speed sensor malfunction
Need to know if you are asking about the vehicle speed sensor, a front wheel speed sensor or rear wheel speed sensor.
A free computer speed check is a service online that offers to check the speed that your internet is providing so you can see how good of a connection you have.