Speed, bus from TC/ABS/ESP: Notes

Fig 1: Communication Diagram - Speed (Bus From TC/ABS/ESP)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The TC/ABS/ESP control module sends bus message "Wheel speed, front right, XXX km/h " via the P-bus to the Trionic control module connection 19 and 66. This speed signal is used to:

• prevent adaptation of idle speed control when the car is moving.
• on manual gearboxes, determine which gear is currently being used. This makes it possible to limit torque in gears R and 1 and activate fuel shut-off in gears 2, 3, 4 and 5. Control of the SHIFT UP lamp also depends on the current gear.
• activate speed limitation by limiting the maximum mass air flow/combustion at 240 km/h.
  Fig 2: Circuit Diagram - Speed (Bus From TC/ABS/ESP)

  Courtesy of SAAB-SCANIA OF AMERICA, INC.