how vss pulses on a 1988 third gen
04-17-2006, 09:09 PM
#1
TECH Apprentice
Thread Starter
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 361
Likes: 0
Received 0 Likes
on
0 Posts
how vss pulses on a 1988 third gen Does anybody know many pulses the cable driven speedo/vss gives off on an 1988 Camaro. I'm going to try and use this signal for the PCM VSS, I just need to know the pulses so I can tune it into the PCM with HPtuners. The transmission has no vss, its an early style 4L60E, and I built the trans using the old 700r4's output shaft, so I could use the stock cable drive speedo.
I'm trying to build this car the cheapest way I can. So far its cost less than $2000, and I had the 5.3L "running" yesterday, meaning no exhaust no rad, water hoses etc. For another $1000 I can have it on the road.
I'm trying to build this car the cheapest way I can. So far its cost less than $2000, and I had the 5.3L "running" yesterday, meaning no exhaust no rad, water hoses etc. For another $1000 I can have it on the road.
04-18-2006, 02:48 PM
#2
http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf
It is a 2000ppm square wave DC sender, the LSx is looking for a 40,000ppm sine wave AC sender.
It is a 2000ppm square wave DC sender, the LSx is looking for a 40,000ppm sine wave AC sender.
04-18-2006, 04:30 PM
#3
TECH Apprentice
Thread Starter
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 361
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by G-Body
http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf
It is a 2000ppm square wave DC sender, the LSx is looking for a 40,000ppm sine wave AC sender.
It is a 2000ppm square wave DC sender, the LSx is looking for a 40,000ppm sine wave AC sender.
04-20-2006, 07:31 PM
#6
Where did you find that it is a 3000ppm signal, I had always read that it was 2000, even the jags that run VSS chapter says 2000.
There are 4 types of VSS signals required by the ECM:
1. The two-pulse (2000 pulses per mile) square wave (D.C current or direct current) used on all TBI
engines thru 1992, all computer-controlled-carbureted engines, and on 1985-1989 TPI engines.
2. A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is
required by the 1990-1993 TPI, 1992-1993 LT1 engines, and 1990-1993 Camaro 3.1/3.4 V6
engines.
3. A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic
transmission, 1994 and newer rear drive cars with the automatic transmission
4. A 17 tooth per driveshaft revolution speed sensor used on 1993-1997 LT1 engines with the Borg-
Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the
Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.
1. The two-pulse (2000 pulses per mile) square wave (D.C current or direct current) used on all TBI
engines thru 1992, all computer-controlled-carbureted engines, and on 1985-1989 TPI engines.
2. A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is
required by the 1990-1993 TPI, 1992-1993 LT1 engines, and 1990-1993 Camaro 3.1/3.4 V6
engines.
3. A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic
transmission, 1994 and newer rear drive cars with the automatic transmission
4. A 17 tooth per driveshaft revolution speed sensor used on 1993-1997 LT1 engines with the Borg-
Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the
Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.
04-21-2006, 08:48 AM
#7
im sorry about that. i ment to type 4000.. i should have looked at my post after i typed it. it is 4000.
the ECM gets 4000ppm. the cruise gets 2000ppm. the cars with elec speedos got a 4000ppm signal too.
in the TBI cars, the signal goes to a converter box. a 4000ppm signal is sent to the ECM and the speedo if equipped...
in the TPI cars, the signal goes directly to the ECM, and the ECM outputs a 2000ppm signal for the cruise.
thats from the GM manuals i have... and confirmed with the 6spd installs ive done. on thoes cars, you need to use a converter box to change the VSS signal.
the ECM gets 4000ppm. the cruise gets 2000ppm. the cars with elec speedos got a 4000ppm signal too.
in the TBI cars, the signal goes to a converter box. a 4000ppm signal is sent to the ECM and the speedo if equipped...
in the TPI cars, the signal goes directly to the ECM, and the ECM outputs a 2000ppm signal for the cruise.
thats from the GM manuals i have... and confirmed with the 6spd installs ive done. on thoes cars, you need to use a converter box to change the VSS signal.
Trending Topics
04-21-2006, 06:01 PM
#8
TECH Apprentice
Thread Starter
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 361
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MrDude_1
its a 4000ppm DC signal.. not 2000ppm.
and no.. the PCM doesnt read it correctly..
and no.. the PCM doesnt read it correctly..
04-21-2006, 07:33 PM
#9
I don`t think the PCM will interpret the DC square wave signal, but I have never actually tried it. If you scroll down to the bottom of the JTR page they make a kit to run a 40,000 ppm sender on the rear end for $75. That would probably be your cheapest option, you may even be able to make your own if you have the capabilites. Dakota digital also has electronic speedo signal convertors for about the same price, but I don`t know if they would work to multiply the signal that many times, the signal may surge enough for th computer to notice it.
