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My speedometer bounces around until i get to about 50mph then it steady's out. it will drop when i put my turn signal on then it will go back to normal, I'm not sure but i think it only drops when i turn it one way I'm not sure which way. Its a 1992 toyota 4x4 dlx pickup 22re. does anyone recognize this problem, if so do you know how to fix this?
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This may not be of any help but I had a 94 and the speedometer kept messing up. One day my wife was in it and she was stopped at a red light and it was bouncing around 30 MPH. She took it to the dealer we bought it from. They told me it is run off electrical signal and the alternator was bad. They changed the alternator and we never had the problem again. Just a thought check your alternator see if voltage is good are bouncing around. You can check it at the battery while it is running. I have never heard of anyone else where the alternator effected the speedometer but it is what I was told and they did change the alternator.
I will say I do not remember the MPH being 0 while running.
Any warning lights lit on the insturment cluster ? ABS Vehicle Speed Signal
The vehicle speed signal is generated by the rear anti-lock brake sensor and sent to the 4-wheel anti-lock brake system (4WABS) module. The 4WABS module sends the vehicle speed signal via circuit 679 (GY/BK) to all systems which require a vehicle speed signal input. Speedometer
The electronic speedometer receives a speed signal from the 4WABS module.
Are you sure it was a fuel problem? Speed sensors, Throttle position sensor, cam and crank sensors, tepmerature sensors, map sensor all contribute signals to the engine control module so it will operate the engine in the most effective way . The best thing to do is to have a diagnostic test done on it to find which components are causing the symtoms.
There is a plastic helical gear in the transmission, where the speedometer cable attaches. Start there. Usually 2-3 bolts that hold it in, when it comes out, some fluid will escape. Check that gear for wear, and broken splines. Then follow the cable up to the cruise control module. Some cars route the speedometer cable to the cruise control transducer, then to the firewall to the instrument cluster. That transducer goes bad. Thats what happened on my 81 olds. The speedometer would bounce around at speeds less than 15 mph. I replaced that transducer and it is steady now.
The speedometer sensor - VSS - vehicle speed sensor is a input to the PCM - powertrain control module -engine computer . The signal from the PCM to the instrument cluster for speed info. is sent on a serial data communication network (class 2 ) I would think it would be an instrument cluster problem . Get a used one from a auto salvage yard 15 - 20 bucks an see if it fixes it . If it does ,send your's out an have it repaired .
when the sensor was installed it was installed wrong.
They wired it into the turn signal feed.
have your dealer or, an auto electrician fix the wiring to your sensor.
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