LS1GMCTruck

iTrader: (2)

Am using an #0411 F-Body computer. What pin-out, if any, has a 128K VSS pulse? thanks

eseibel67

iTrader: (10)

On the C2 PCM connector:

pin 20 is VSS low sig.
pin 21 is VSS hi sig.
pin 50 is VSS output.

LS1GMCTruck

iTrader: (2)

Thank you. Wonder if pin 21 is 128K?

oange ss

iTrader: (50)

none, pin #50 is square wave 4000 pulse output

BRPhotrods

iTrader: (3)

What are you looking for the 128K pulse for? If you're adjusting the DRAC module on your truck let me know. When I built my carb'd 4th gen I used a GM truck DRAC module to drive the factory speedometer. I can check if I still have the diagrams and the table I used to calibrate the DRAC module if you'd like.
Jeff

LS1GMCTruck

iTrader: (2)

This is all that is needed to make my ABS operable again, I think. 1996 GMC fullsize. Thanks

BRPhotrods

iTrader: (3)

Yeah, the 128K only drives the ABS.

350SS

iTrader: (38)

I'm not sure there is one using the f-body tune... Could you use a truck tune instead? If so it would be C2/49. Might see if this output is present using the f-body tune if you have an oscilloscope.

oange ss

iTrader: (50)

I did a 411 swap in my 96 Z71, I think my ABS still works , but I've never tried it

LS1GMCTruck

iTrader: (2)

Yeah...I wonder how you check if your ABS brakes work, after you wire "any" VSS to it? lol Whats the test?

oange ss

iTrader: (50)

stand on the brake pedal at 50 mph and see what happens I guess.....

ProStreetZ28

iTrader: (2)

Just make sure to point the car/truck at a wall while testing it that way! You know it'll give you added incentive to make sure it works. J/K