Tbi swap build thread

[cjracing15]

I thoght that on OBD II they did not use a vss sensor, but the ecm got it's signal from the abs computer.?

[DirtyLarry]

Originally Posted by cjracing15

I thoght that on OBD II they did not use a vss sensor, but the ecm got it's signal from the abs computer.?

VSS is still used today to provide data to the PCM/ECM for engine controls, speedo, cruise, trans shifting scheduling, torque converter lockup, etc but not ABS. These days, there is actually a wheel speed sensor at each wheel to provide input to the ABS module to control 4 wheel ABS system and traction control if equipped. In the TBI days the trucks only had rear wheel ABS which the rear wheel speed input to the ABS module was read from the VSS sensor on the tail shaft of the transmission.