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Old 01-28-2005, 10:37 PM   #1
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Default Vin "C" VSS Speed Sensor, What kinda signal does

Anybody have any idea as to what kinda signal (output) the VSS Vehicle Speed Sensor sends to the ECM?? Is it an AC signal like the Crank sensor? Maybe a DC Voltage signal?
Anybody ever disconnected theirs and drove without it? What would happen?

Any ideas would be appreciated thanks.
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Old 01-28-2005, 11:27 PM   #2
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The VSS output is pulses. My 90 diagram states that pulses per mile vary with options but I believe that it is 4000 pulses = 1 mile.

Description and Operation

The Vehicle Speed Sensor provides information to the ECM for control of idle speed and transmission converter clutch engagement as well as controlling canister purge of the fuel evaporative emission system. This signal is generated by an optical sensor in the speedometer head or a Permanent Magnet generator located in the transmission.
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Old 01-29-2005, 03:12 AM   #3
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Any idea if the signal sent to the ECM is changed from an AC pulse in the ECM or is it buffered at the Sensor itself??

Do most GM cars (including RWD) with VSS'* on them generate this same 4000 pulses per mile signal??
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Old 01-29-2005, 08:56 AM   #4
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Quote:
Originally Posted by newpontiac
Any idea if the signal sent to the ECM is changed from an AC pulse in the ECM or is it buffered at the Sensor itself??

Do most GM cars (including RWD) with VSS'* on them generate this same 4000 pulses per mile signal??
hey i would consider a 4l60 tranny
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Old 01-29-2005, 09:57 AM   #5
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[southern drawl]

Buffered is sumpthin you does to your paint, silly...

[/southern drawl]

The diagram shows one input from the VSS and two different outputs:
2000 pulses per mile - DIC module and cruise control module
4000 pulses per mile - instrument cluster and safety belt retractor release solenoid timer (AR4 RPO code only)

What do you have up your sleeve?
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Old 01-29-2005, 10:05 AM   #6
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Default unplugged

unplugged mine once to try and solve a deceleration idle problem. (still have)
It totally messed up the idle around 600 rpm.
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Old 01-29-2005, 03:13 PM   #7
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Quote:
Originally Posted by randman1
[southern drawl]

Buffered is sumpthin you does to your paint, silly...

[/southern drawl]

The diagram shows one input from the VSS and two different outputs:
2000 pulses per mile - DIC module and cruise control module
4000 pulses per mile - instrument cluster and safety belt retractor release solenoid timer (AR4 RPO code only)

What do you have up your sleeve?
http://www.bonnevilleclub.com/forum/...ic.php?t=29572
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Old 02-03-2005, 11:05 PM   #8
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It is a square (squarish) wave. 0-5VDC.
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