Originally Posted by
DSteck
So here's a question... A 2006 Corvette automatic ECM file has the Vehicle Speed Output set to Serial and the Speed Output Type set to VehSerial. On a manual, the Vehicle Speed Output is set to RepTOS and the Speed Output Type is set to VehRepTOS.
Why the difference? Is one of these actually defining how the ECM input is configured? Manual transmission Corvettes use a speedo signal off of the differential that runs straight to the ECM. Automatic Corvettes get their speedo signal over GM LAN from the TCM. The reason I ask is I've got an automatic in my Z06, but we haven't actually moved the vehicle yet. I'm running a GM TCM, and CAN communications are fully working, but we obviously can't test the speedo yet. The ECM should still shoot out the same 4000 PPM output regardless, correct?