VSS goes to the PCM to inform it of vehicle speed. The PCM then sends a signal to the speedo on another wire based on the info it receives from the VSS.
I ran the wire directly to the gauge cluster, bypassing the buffer. Speedo is within 1 MPH in calibration. That's close enough for me.
The PCM must be flashed for the gear ratio and tire size/diameter for the calibration to be correct.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John
Right on, thanks guys that clears things up alot. Now I just need to resolve a random missfire issue. Kept getting code p0300. Had my tuner check into it and he thinks its a fuel delivery issue or the maf is shot. Says its getting 75% of what it needs. Suspects the maf is shot but its brand new.. any one else have this issueOriginally Posted by Mickeymotormount
Last edited by Hulknasty; 03-08-2015 at 12:06 AM.
I had the same problem,,, ended up being that I did not have the plug from the harness snugly plugged into one of the coils
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