reprogram stock PCM for different speed sensor?
#949957
03/13/11 04:55 PM
03/13/11 04:55 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
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OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Maybe someone who works at a dealer might know?
friend of mine just bought a 98 Dakota with a viper spec T-56 swap done to it. this gearbox has the electronic speed sensor inside of it, or at least, it would appear that way by the electrical connectors coming out the side of the case.
I'm about to swap him rear axles as well, but mine does not have the tone ring inside of it for the factory speed sensor--I left it out because I didn't feel like fighting with it to get it off the stock ring gear, and transfer it to my near ring gear...especially when I was running a carb'd motor without any computers, and didn't need the speed sensor.
well, his truck is still a computer controlled EFI truck.
is there a way to program the computer to be happy with the signal from the T-56 speed sensor and use that, instead of having to tear open the diff on my axle just to add a tone ring to the ring gear for the speed sensor?
I know that the parameters are programable somewhat, because you can change the calibration based on tire sizes, but how wide of a range can you go with?
**Photobucket sucks**
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Re: reprogram stock PCM for different speed sensor?
[Re: 70Cuda383]
#949958
03/13/11 06:25 PM
03/13/11 06:25 PM
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Joined: Feb 2003
Posts: 2,928
A tad North of Indy
Blown71X
super gas
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super gas
Joined: Feb 2003
Posts: 2,928
A tad North of Indy
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If it truely IS a viper T-56 then yes it does have a speed sensor....Left side rear, 3 prong pigtail...this is a Hall Effect sensor This isn`t going to be plug and play and I really don`t think you can even make it work for several reasons. First: the Dak gets it`s speed sig obviously from the rear sensor, However the ABS module does the conversion for the signal and then sends it to the PCM. Second: the ABS is looking for an inductive sensor and it`s corrosponding resistance and sinewave output for diagnostics, it will not be happy with a square wave from the T-56 sensor (there are ways around this) Third: Without actually seeing the tone wheels and doing some simple calcs on the pulses per rev, it is just a guess but if it is way different the ABS will probably not be able to go far enough with the difference (it has a very limited range) Put the tone ring back on the rear...And by the way, it dosen`t go on the Ring gear, it is pressed on the carrier and is VERY easy to do. Just my  Rick
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Re: reprogram stock PCM for different speed sensor?
[Re: Blown71X]
#949959
03/13/11 06:37 PM
03/13/11 06:37 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
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OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
If it truely IS a viper T-56 then yes it does have a speed sensor....Left side rear, 3 prong pigtail...this is a Hall Effect sensor
This isn`t going to be plug and play and I really don`t think you can even make it work for several reasons.
First: the Dak gets it`s speed sig obviously from the rear sensor, However the ABS module does the conversion for the signal and then sends it to the PCM.
Second: the ABS is looking for an inductive sensor and it`s corrosponding resistance and sinewave output for diagnostics, it will not be happy with a square wave from the T-56 sensor (there are ways around this)
Third: Without actually seeing the tone wheels and doing some simple calcs on the pulses per rev, it is just a guess but if it is way different the ABS will probably not be able to go far enough with the difference (it has a very limited range)
Put the tone ring back on the rear...And by the way, it dosen`t go on the Ring gear, it is pressed on the carrier and is VERY easy to do.
Just my
Rick
hmm...I knew the ABS used the same sensor, but was unaware that the ABS computer is actually what "reads" the speed signal to send to the PCM.
pretty sure his gearbox is a true viper unit. it has what I thought was a neutral safety switch (3-prong pig tail...maybe this is the speed sensor?) there's 2 plugs for the reverse lights, one at each shift location, and there's a viper logo stamped into the side of the casing. there was another plug on the right side of the case down low that I thought might be the speed sensor.
(my TKO has a speed sensor, NSS, and reverse indicator switch--NSS comes out of the shift location, Reverse comes out the side of the gearbox--both on the left, and the speed sensor was down low on the right side.)
**Photobucket sucks**
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Re: reprogram stock PCM for different speed sensor?
[Re: Blown71X]
#949961
03/13/11 07:27 PM
03/13/11 07:27 PM
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Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
OzHemi
Penguin-hating Ginger
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Penguin-hating Ginger
Joined: Jan 2003
Posts: 104,346
Garden Grove, CA
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Quote:
Not that it matters much and i`m going from a short memory because it has been 2 or 3 years since i`ve touched a T-56 but the backup switch is on the right side, The 2 solenoids on the left side at the top are the reverse lockout (by the shifter mount) and the other is the 2-3 lockout (forward of case split)
Rick
That is just where they are on my T56 (F body) at least...
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Re: reprogram stock PCM for different speed sensor?
[Re: 70Cuda383]
#949962
03/14/11 03:28 AM
03/14/11 03:28 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
If it truely IS a viper T-56 then yes it does have a speed sensor....Left side rear, 3 prong pigtail...this is a Hall Effect sensor
This isn`t going to be plug and play and I really don`t think you can even make it work for several reasons.
First: the Dak gets it`s speed sig obviously from the rear sensor, However the ABS module does the conversion for the signal and then sends it to the PCM.
Second: the ABS is looking for an inductive sensor and it`s corrosponding resistance and sinewave output for diagnostics, it will not be happy with a square wave from the T-56 sensor (there are ways around this)
Third: Without actually seeing the tone wheels and doing some simple calcs on the pulses per rev, it is just a guess but if it is way different the ABS will probably not be able to go far enough with the difference (it has a very limited range)
Put the tone ring back on the rear...And by the way, it dosen`t go on the Ring gear, it is pressed on the carrier and is VERY easy to do.
Just my
Rick
hmm...I knew the ABS used the same sensor, but was unaware that the ABS computer is actually what "reads" the speed signal to send to the PCM.
pretty sure his gearbox is a true viper unit. it has what I thought was a neutral safety switch (3-prong pig tail...maybe this is the speed sensor?) there's 2 plugs for the reverse lights, one at each shift location, and there's a viper logo stamped into the side of the casing. there was another plug on the right side of the case down low that I thought might be the speed sensor.
(my TKO has a speed sensor, NSS, and reverse indicator switch--NSS comes out of the shift location, Reverse comes out the side of the gearbox--both on the left, and the speed sensor was down low on the right side.)
Actually the ABS sensor is not the same as the 3 wire hall effect sensor on the trans. As Rick stated the ABS is a 2 wire AC inductive sensor which is different then the 3 wire hall effect sensor on the trans and would not work with the ABS. Ron
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