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testing VSS

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Old Dec 7, 2009 | 07:37 PM
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Default testing VSS
is there a way to test the VSS (vehicle speed sensor)?

i did the t-56 swap into my 03 silverado

I plugged the connecter from the auto into my t-56 and it does not read my speed.

is it possible that it requires other wires to be hooked together to get power or ground?

is there a easy way to test the vss?

thanks,
Keith
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Old Dec 7, 2009 | 10:47 PM
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Most likely its a variable reluctance. Its a two wire sensor that creates it own voltage.

Check resistance in the sensor.
check ac voltage output from the sensor

Are you hooked up to a scan too?
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Old Dec 7, 2009 | 11:07 PM
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i just have a equus code reader with live data, what should i be looking for resistance wise on the sensor?
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Old Dec 7, 2009 | 11:22 PM
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its a magnetic pulse generator, it outputs an AC voltage, u need a meter that has a frequency setting to test it.
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Old Dec 8, 2009 | 07:14 AM
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ok, and what kind of ac values am i looking for? what determines a good one vs a bad one
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Old Dec 8, 2009 | 09:33 AM
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If you see any AC voltage, the sensor is good. The faster you spin the outpur shaft, the higher the voltage.
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Old Dec 8, 2009 | 10:41 AM
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do i have to get the trans spinning? or can i do it with the sensor out of the transmission?
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Old Dec 8, 2009 | 12:35 PM
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F-body uses a PM (pulse megnetic) generator. When a reluctor wheel (on the main output shaft) rotates close to the sensor, the sensor generates AC voltage. Put your Fluke (multimeter) on AC scale, and check for ANY voltage while the reluctor wheel is spinning.

Another easier option would be to check for resistance on the sensor (use ohms scale).
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What numbers am I looking for when checking the vss for ohms
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