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Old 24 Dec 2009, 10:01 pm
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Default Speedometer not working on a 1993 prelude vtec? Is this an easy fix?

Ok heres the situation:































My speedometer won't go below 20mph, but when I go past 20mph the speedo jerks straight to 40 then goes slow. Its off by about 10 mph. Many say it is the speed sensor BUT I think my case is different.















The previous owner, who originally put larger rims/wheels on the car, decided to keep the rims and put the stock ones back on. I'm assuming this is most likely my reason? How can I fix this?































Also, the ABS light is on, but it flashes once (code 1 - abs modulator/hydraulic pump overflow). Iono if that has anything to do with it. The car also pulls to the left VERY slightly when braking, but there is no noise or vibration.































So really I'm just confused here cause I don't know what needs fixing. I don't want to replace the VSS speed sensor when I actually needed to replace the wheel sensor, etc. Could someone help me out and tell me how to deal with these problems? THanks.
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Old 24 Dec 2009, 10:16 pm
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if you still have the bigger wheel/tire combo your speedo will register 10 mph faster than your actually going, if your doing 30 your really doing 40.































but if you go stock tires, id change the vehicle speed sensor, cant do no harm if it doesnt work, just 20$ piece.
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Old 24 Dec 2009, 10:31 pm
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Hi there !































That is a very common problem to Honda Preludes!.































I have seen what you are describing many , many times.















The speedometer will not work or be erratic or get stuck!































More than likely the Speedometer has gone bad but the Speed Sensor could also be bad!































When the Speed Sensor is Bad: you will get a Check Engine Light in the Dash.So it sounds like your Speedometer is bad.































Here is how it works.































The speedometer is run electrically.(i do not mean digital!)































So there is nothing to grease in the Speedometer System as everything is electronic components.That means there is No Cable Running the Speedometer To Break!!































First you need to check for a proper signal from the Speed Sensor.To measure the signal you need to hook and auto meter to the wire and check for AC VOLTAGE. It will be small and goes up and down with the speed of the vehicle. A good square wave on a scope.































If there is no signal then you must replace speed sensor.If not then move on to the Speedometer.































The main Integrated Chip on the speedometers circuit board has probably gone bad.This causes erratic or no operation of the speedometer/odometer.































There is no way to repair the problem.You must get a new or used speedometer ! !































My local pick n pull junkyard will sell me a speedometer for $20.00 for that vehicle in San Jose California.(the dealership wants $280.00 brand new.)































i hope that helps. Good Luck!
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