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Hi.. The speedometer jumps around (20 mph to 70 mph) soon after the car is started… I can be sitting at a traffic light and the odometer is adding miles as if we are moving… D indicator is blinking… reading online it appears my VSS is bad? two on automatic models? Hard to replace? can anyone tell me where they are located and replace both or is one more problematic? Thanks.
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[quote=”paulrs” post=134491]Hi.. The speedometer jumps around (20 mph to 70 mph) soon after the car is started… I can be sitting at a traffic light and the odometer is adding miles as if we are moving… D indicator is blinking… reading online it appears my VSS is bad? two on automatic models? Hard to replace? can anyone tell me where they are located and replace both or is one more problematic? Thanks.[/quote]
see if this helps. what codes have you gotten?
http://www.justanswer.com/honda/15ujl-need-find-vehicle-speed-sensor-wire-2008-elem.html
Hello 🙂
Here you have photo and diagram. Its youre output shaft vss for speedo..
You see it get a Reference voltage (belive ca. 5 volt) you could measure signal back too pcm and see what voltage it is when car not move.. Then you know for sure if vss is bad.Hi… awesome picture and diagram. I went and looked… they are under the air intake filter box. I will replace the output sensor first… and see if that fixes it… they look easy to reach.. Thank you thank you thank you for the help… will let you know later in the week how it goes.
I would test the sensor before replacing it, as it may not be the sensor, but a wiring fault or PCM issue. It would be a shame to spend money on a sensor only to find out that it wasn’t faulty. It may also be corrosion inside the sensor connector. There should be a power (either 5v or 12v), a ground, and a 5.0v (+/- 0.5v) signal reference voltage on the wires going to the sensors. If your reference voltage is more than 0.5v out of spec, it means that voltage regulation (inside the PCM) for this circuit has failed. This type of fault is a common problem as vehicles age. I have seen batteries and alternators cause these kinds of problems also. Make sure your battery cables, especially the ground cable, is free of corrosion, clean of dirt and oil, and tight to the battery terminals. Check your charging voltage while the engine is running to make sure it is above 12.5 and below 15.0v. Your sensor may very well be bad, it does happen, and is fairly common, but a few minutes of checking things out will let you know for sure it is bad, and possibly save money if the sensor isn’t bad. Quite a lot of “good” sensors are sitting in the landfills.
im totaly agree with cap269. this is easy to measure. and always fun to find what couses the fault. 🙂
but anyway, hope you get the speedo fix 🙂Check the output power coming out of the alternator. If the regulator is having a problem getting it to a flat DC it will create a wave in the power that is messing up some of the sensors and how it is being interpreted. You have to many things that are going wrong at once. You will have to scope the power to test can not use a Multi meter.
Edit: This is the same a cap269, Check the power from the regulator and the battery. The battery will flatten it out a bit.
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