VSS Signal type & ALDL signal type
04-18-2002, 11:59 AM
#1
VSS Signal type & ALDL signal type
Does somebody have information about exactly what type of signal goes from the VSS to the ECM (say the 165 and 730 ECMs) as well as the signal type that is present at the ALDL? Long story short, I want to build a digital speedometer and I have no idea what type of signal I'm even dealing with here. Thanks.
04-19-2002, 01:30 AM
#2
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Car: 92 Z, 91 Formula, 04 CTS, 01 Tahoe
Engine: 355 forged 4 bolt, SuperRam, 58mm t
Transmission: T5, looking for t-56
I know it is an AC voltage signal that increases as the speed goes higher.I don't know about the signal at the ALDL though.
04-19-2002, 06:54 PM
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Car: 92 Z, 91 Formula, 04 CTS, 01 Tahoe
Engine: 355 forged 4 bolt, SuperRam, 58mm t
Transmission: T5, looking for t-56
If I am not mistaken,it is the voltage that fluctuates.
05-09-2002, 02:02 PM
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Car: 1999 Pontiac T/A Firehawk
Engine: ***'s Engine
Transmission: T56
Nope, it's actually the frequency. The voltage may fluctuate, but the frequency is what carries the "data".
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