Special gear change program

The special gear change program is selected automatically depending on the load on the engine. This function exists in both the normal and sport programs.

The shifts occur at higher engine RPM and the gear is engaged for longer if the control module senses that the load does not decrease. These shifting programs are in place to avoid unnecessary up and downshifting, for example, when driving on long uphill stretches with a trailer as well as to prevent overheating of the transmission fluid.

The special gear change programs are not activated at speeds over 150 km/h. If a special gear change program is active when the speed increases to over 150 km/h the program is retained until the control module senses that a more appropriate change pattern can be activated.

Fig 1: Identifying Special Gear Change Communication Diagram (1 Of 2)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Special Gear Change Communication Diagram (2 Of 2)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The special gear change program is disconnected if:

• The winter program is selected.
• The ignition key is turned to the OFF position.
• The loading reduces to such an extent that a special gear changing program is no longer needed.
• CHECK GEARBOX lamp lights up.
  Fig 3: Identifying Special Gear Change Heating Temperature

  Courtesy of SAAB-SCANIA OF AMERICA, INC.