Ls3 pcm
Ls3 pcm 
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Joined: Dec 2005
Posts: 2,932
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From: CT
Vehicle Speed Sensor... used for your speedo, and can also be used by ABS and stability control systems...
the pulses per mile would depend on the cars gearing and tire size...
the pulses per mile would depend on the cars gearing and tire size...
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
I think he is looking for what number of pulses per mile the PCM is looking for from the transmission and maybe what is the signal that is being sent to the speedo (if all things were stock on the car such as wheel size, rear gears, etc.).
Thread Starter
Registered User
Joined: Jan 2011
Posts: 5
Likes: 0
From: Michigan
Thanks ssgunny and 06MonteSS for the reply. I should have explained a little more, I was looking for what effect the VSS signal has on the engine management system. I am using a 6 speed manual transmission (F40) that puts out 60K pulses per mile. But when I am running at 60 MPH the scanner tells me the PCM has a reading of a little over 30 MPH. Does this effect engine performance. The speedometer is corrected to the correct signal with the use of a Dakota Digital frequency converter for 60K to 4K pulses per mile.
Although it's not totally a yes or no question, if you aren't having idle or return to idle issues, you should be fine since the PCM actually sees when the car is moving and when it's stopped.
