When I tapped the purple-white VSS wire in my 05 corolla after 25 mph driving a check engine light triggers VEH Speed Sensor Malfunction.. Anyone have any clue why?

Where'd you tap, and is the wire still in tact. That's a pretty popular car around me, done a few without any issues. Pics too if possible.

I used a tap in connector in to that wire right before the plug to the ECU. I took the tap off.. wire is still intact and I reset the CEL and no problems. Seems that everytime I tap it, it causes it to happen. I will take pics tommorow. I also had a ODB scanner on when it happens and it shows no reading to VEH speed when the D3 is connected to that wire.

thats weird. the speed sense wire from the avic only reads. it doesnt put anything out, so that really shouldnt be happening

If you have access to a meter, try this. Disconnect and remove the avic from the car. Set the meter to continuity. Now put one probe of the meter to ground. Either the ground wire in the harness or unpainted metal on the car. Make sure the vss wire is disconnected from the wire at the ecm. Put the other probe on the end of the vss wire that you had hooked up to the ecm. you should NOT have any continuity. If you do, then you have a short to ground in the vss wire. Replace or repair it and try again.

I'll definitely check it out tommorow and will let you know.

When I tapped the purple-white VSS wire in my 05 corolla after 25 mph driving a check engine light triggers VEH Speed Sensor Malfunction.. Anyone have any clue why?

Not trying to sound like a smart a** at all but VSS is the pink wire. purple/white is for the reverse.

awesome t! reading sux

Not trying to sound like a smart a** at all but VSS is the pink wire. purple/white is for the reverse.

Purple/white in the car is VSS. They aren't talking about the one coming off the AVIC.

oh ok, my mistake.

Thanks for the help guys.. Looks like there was a bad ground or connection to the VSS wire. Tested and works now.