Somebody tell me what I did wrong. 1994 full size P/U with 2002 5.3/4l60e. I ran the VSS wires coming out of the PCM to the DRAC module under the dash to the terminals where the original VSS was hooked. I got no speedo at all. Am I overlooking something obvious? I won't have time to trace wires and check the service manual for a couplr days.
2002 SWB 2WD crate 6 liter/Whipple, 4L80E, comp cam, ASM headers, NOS, etc, etc.... best of 7.29 at 97 mph in the 1/8th
1994 Work Truck 2WD Supercharged 5.3/4L80E combo. Has had a LT1 for the last 3 years. Ran 9.61 in the 1/8th with the LT1 Has went 8.81 with a 2.35 60ft in current trim, needs traction !!
Mine is also a '94, i'll check mine tomorrow and my books and see whats up.
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OK, thanks. I think I already know what is up. I used the wires coming out of the PCM (which have a "processed signal") to hook to the DRAC. The DRAC is a "processor" which when the truck was stock took the signal from the VSS and processed it for the cruise, speedo, abs etc. I think I need to hook the DRAC to the actual VSS wires coming from the tranny, not the VSS wires coming out of the PCM. Does that sound logical?
2002 SWB 2WD crate 6 liter/Whipple, 4L80E, comp cam, ASM headers, NOS, etc, etc.... best of 7.29 at 97 mph in the 1/8th
1994 Work Truck 2WD Supercharged 5.3/4L80E combo. Has had a LT1 for the last 3 years. Ran 9.61 in the 1/8th with the LT1 Has went 8.81 with a 2.35 60ft in current trim, needs traction !!
I think I would bypass the DRAC and hook the speedo directly up to the PCM. That way you can calabrate the speedo with the PCM for gear and tire changes.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
I ran the actual VSS wires to the DRAC anda it still didn't work! Then I remembered that I never plugged the DRAC back in after unhooking it to test some wires. Now it works fine. DOHH!!
2002 SWB 2WD crate 6 liter/Whipple, 4L80E, comp cam, ASM headers, NOS, etc, etc.... best of 7.29 at 97 mph in the 1/8th
1994 Work Truck 2WD Supercharged 5.3/4L80E combo. Has had a LT1 for the last 3 years. Ran 9.61 in the 1/8th with the LT1 Has went 8.81 with a 2.35 60ft in current trim, needs traction !!
Cool so what was the final wiring? I think Farmtruc still needs to get his hooked up!
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
ya, how did you hook it up and can you give specifics.Originally posted by L-Eater@Dec 14 2003, 05:53 AM
I ran the actual VSS wires to the DRAC anda it still didn't work! Then I remembered that I never plugged the DRAC back in after unhooking it to test some wires. Now it works fine. DOHH!!
thanks,
allen
Nelson Performance
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'94 Chevy Truck: 8.9 et, 408 twins
OK, I took the factory Lt Green/Black wire and the Purple/White wire that runs from the DRAC to the VSS on the tranny in stock configuration on the 94 truck and cut it in the engine compartment. These wires are a twisted pair enclosed in black insulation. Take the ends and run them to the new PCM and hook them to terminal 20 and 21, respectively. The wires are color coded at the PCM. Hook into them but leave them intact (just "skin back the insulation without cutting the wire) and twist and solder the wires from the DRAC and you are done!
2002 SWB 2WD crate 6 liter/Whipple, 4L80E, comp cam, ASM headers, NOS, etc, etc.... best of 7.29 at 97 mph in the 1/8th
1994 Work Truck 2WD Supercharged 5.3/4L80E combo. Has had a LT1 for the last 3 years. Ran 9.61 in the 1/8th with the LT1 Has went 8.81 with a 2.35 60ft in current trim, needs traction !!
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