VSS and Reverse lockout silenoid wiring t56

[csouth]

When I first started my LS swap, I was using a complete standalone transmission setup. I am assuming I can wire the reverse lockout into the ECM once I locate which connector on the ECM contains these functions? Since the reverse lockout works on speed, does the VSS need to be wired into the controller? Also, if I wire the VSS into the ECM, will it be difficult to connect my electronic speedo into this setup? I'm also assuming that I will need to have the ECM flashed to manual?
Any feedback would be greatly appreciated.



THanks

[csouth]

Well I found the connector locations for the 2 sensors which leads me to believe I can wire them back in and would be all set with a new flash.

[130fe]

Which PCM/harness are you using? I am using the GMPP LS3 harness (E67) and it included the VSS plug. I did add on the reverse lockout wiring (not hard to do), you just need a wire with the correct PCM pin to add it. For the RL circuit, you have to have 12v ignition power one one side (of the plug) and then the PCM transmits the "ground". Mine works great.

[csouth]

Which PCM/harness are you using? I am using the GMPP LS3 harness (E67) and it included the VSS plug. I did add on the reverse lockout wiring (not hard to do), you just need a wire with the correct PCM pin to add it. For the RL circuit, you have to have 12v ignition power one one side (of the plug) and then the PCM transmits the "ground". Mine works great.

Thanks. The harness is from the TBSS where the motor was pulled. It has the E67 controller also. Because I was initially doing an Olds 455 with stand alone 4l80e, the VSS was included with that harness. Not thinking I would ever need it, the truck harness was stripped of any VSS connections.
I found the pinout for the RL to be C3/8 and the VSS to be C3/66 and C/67. If I understand correctly, it doesn't matter which wire for the VSS or the RL go to either location, as long as they are both connected?

[David LaBuda]

Either way, the computer should get a VSS signal. It's important that the computer know the car is moving. There should be a speedometer wire (there is with Gen III computers) that can be connected to an aftermarket programmable speedometer.

I connected my reverse lockout to the brake switch. It works pretty well but I'd rather have it locked out with speed by the computer.

[BonzoHansen]

I connected my reverse lockout to the brake switch. It works pretty well but I'd rather have it locked out with speed by the computer.

I initially did that. I found it energizes the solenoid too much and I'd go to down shift coming into highway exits and hit rev instead of fifth. I added a n/o momentary switch just under the dash.

[mmosley]

I initially did that. I found it energizes the solenoid too much and I'd go to down shift coming into highway exits and hit rev instead of fifth. I added a n/o momentary switch just under the dash.

My ECM has an auxiliary output which triggers high above a certain MPH and TPS position. I will use the VSS output into the ECM from the T56. My plan is to then set the auxiliary to trigger when TPS is more than "0", and the mph is more than "4" and send this output to a normally closed or switch over relay. When "on" it will open the relay and drop the voltage to the T56 reverse lockout solenoid. I will either do this or have two relays in series such that the voltage to the solenoid is only applied below 4 mph and when the brake switch is on.

[David LaBuda]

I initially did that. I found it energizes the solenoid too much and I'd go to down shift coming into highway exits and hit rev instead of fifth. I added a n/o momentary switch just under the dash.

I've had the same problem.

[parsonsj]

I use this module, which works great, especially for retro-fit when adding the pins to the ECM isn't so easy.

http://www.wirebarn.com/T56--TR6060-...low_p_470.html

[carguy502]

I use this module, which works great, especially for retro-fit when adding the pins to the ECM isn't so easy.

http://www.wirebarn.com/T56--TR6060-...low_p_470.html

I have also used this on my T56 setup. I did find that I was unable to power both this module and an electric speedo at the same time, but I just got a GPS speed sensor.

[andrewb70]

I have also used this on my T56 setup. I did find that I was unable to power both this module and a electric speedo at the same time, but I just got a GPS speed sensor.

Any idea why?

JP,

Did you run into a similar problem?

Andrew

[carguy502]

Any idea why?

JP,

Did you run into a similar problem?

Andrew

I am afraid I have no idea. I tried splitting the VSS signal wire, Switching wire positions, etc. I could never get the speedometer to read when connected to the module, but the module always worked. It *might* be related to the gauge itself (New Vintage 1969 series), however, the guage works flawlessly with a standalone signal source, so I do not think it a defect.

Don

[csouth]

I use this module, which works great, especially for retro-fit when adding the pins to the ECM isn't so easy.

http://www.wirebarn.com/T56--TR6060-...low_p_470.html

Nice module.... I'm going to see if I can add the pins to the ECM first....

[parsonsj]

I have also used this on my T56 setup. I did find that I was unable to power both this module and an electric speedo at the same time, but I just got a GPS speed sensor.

I'm not sure what you mean by an "electric" speedo. I use an Auto Meter speedometer that uses the VSS signal coming from the ECM. No issues at all.

[carguy502]

I'm not sure what you mean by an "electric" speedo. I use an Auto Meter speedometer that uses the VSS signal coming from the ECM. No issues at all.

Simply referencing a speedometer that does not use a cable input, as my T56 has no cable provision. I have an EZ-EFI ECM that does not use a VSS in any form, your solution would not be an option for me.

I am curious, though. Is the ECM powering your speedometer and the reverse lockout module from the same wire?

Don

[parsonsj]

Is the ECM powering your speedometer and the reverse lockout module from the same wire?

No. I use the box mentioned above for the lockout module, and the ECM for the speedo. I did have to split the VSS signal to send it to both boxes.

[BonzoHansen]

John that worked well for you? I might consider that next time I do some interior wiring work.

[parsonsj]

Scott: works great. Lockout module works as advertised, and running the VSS through the ECM gives the ability to calibrate the signal sent to the speedometer.

[icemanrd19]

anyone know which is the vss reference and the vss signal wire for the gmpp kit using the t56 magnum?

[David LaBuda]

Quick update, I was able to add reverse lockout function using HP Tuners. I had set the transmission program to manual but I still wasn't getting anything to the solenoid so I sent an email to online support. They sent me a customized 2.25 beta version of the vcm editor with the option to turn on the reverse lockout solenoid. I just used the pinout from an 04 vette to figure out the wiring. It works great and I can set when the solenoid engages and disengages just like it was a factory option.