Vehicle Speed Sensor ??? how to test
Thread Starter
Junior Member
Joined: May 2008
Posts: 36
Likes: 0
Car: 88' Trans-AM WS6
Engine: 305 TPI
Transmission: Auto
Vehicle Speed Sensor ??? how to test
I Need information on the VSS in a 1988 trans-am with a 305 TPI.
I think it produces 2000 pulses per mile.
12vdc pulses? Can anyone help me troubleshoot please
I think it produces 2000 pulses per mile.
12vdc pulses? Can anyone help me troubleshoot please
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
THE NEED FOR SPEED . . . . . . . . . SENSOR
The VSS outputs AC which is converted to DC VIA a buffer or the ECM depending on engine configuration.
To test the VSS connect an oscilloscope to observe the waveform.
In lieu of a scope use an audio amplifier.
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Happy Racing!
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If People Drove Any Slower They’d Be Going Backwards
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Senior Member
Joined: Jul 2006
Posts: 609
Likes: 0
From: Oslo, Norway
Engine: '85 Monte SS L69 305
Transmission: TH 200-4R
Axle/Gears: 3.23
Re: Vehicle Speed Sensor ??? how to test
Try this: locate the VSS pin on the ECM and hook a voltmeter to it. Moving the car real slow (with ignition) on should make the meter jump up & down if it has an optical speedometer sensor with buffer. If it has an inductive tranny mounted speed sensor you'll need a little more speed and a scope to see what happens. Or use the audio method as NINÅ suggests, it also works. A 10k resistor in series with a pair of earphones is the simplest method.
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