Speedometer runs too fast - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 07-22-2007, 09:01 PM
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3rd Generation Speedometer runs too fast

My 94 Camry speedometer readout seems to indicate a higher speed than actual. At one time while stopped, the speedometer read 5 mph, and at another time 15 mph. While actually moving, maybe at 35 mph, the speedometer reads around 50 mph.

Any idea what might be the problem.

Also interested in the technology. Is this a magnetic pick-up or hall effect type sensor on a toothed gear, or some other technology.

Thanks
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#2 Old 07-22-2007, 10:57 PM
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The differential has a speed sensor installed on the top. The sensor appears to generate an alternating signal via a rotating magnetic ring (much like an alternator at four cycles per rev of its shaft). The signal goes to the instrument cluster where it is reshaped to a square wave and sent to the ECU.

Last edited by toyomoho; 07-22-2007 at 11:16 PM.
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#3 Old 07-23-2007, 12:38 AM
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You might check the connection where the speed sensor plugs in .... near the differential, probably. Just disconnect .... spray with electrical contact cleaner, reassemble. Also, inspect the wires in the vicinity for any signs of frayed insulation, or anything unusual.

98 Camry LE, 2.2L, automatic
54k miles, drop in K&N A/F, ... timing belt, water pump, NSS
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