WINTER shifting program

Fig 1: Identifying Winter Shifting Program Communication Flow

Courtesy of SAAB-SCANIA OF AMERICA, INC.

A WINTER shifting program is provided to facilitate starting on a slippery road surface. With the selector lever in position D and the WINTER shifting program activated, the car will start in 3rd gear and then normally shift up to 4th gear.

With the selector lever in position 3 only 3rd gear will be used.

WINTER and NORMAL shifting programs can be selected with a switch on the selector lever console.

The switch has two connections, one to control module pin 22 and the other to grounding point G41S. The control module supplies B+ to pin 22. When the button is pressed in, the circuit closes to ground and a change between the shifting programs WINTER and NORMAL is achieved.

The TCM sends information on the current mode as bus information WINTER, unit ON/OFF. In connection with bus information "WINTER ON", the main instrument unit turns on the WINTER indicator lamp.

Fig 2: Winter Shifting Program Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Functions in different selector lever positions when the WINTER shifting program is selected:

WINTER will be disconnected if:

• the switch is pressed
• the ignition is turned to position ON
• the fluid temperature is 140°C
• when Limp-Home mode is activated
• lever position 1 or 2 is selected.
• kick-down is activated but returns to WINTER when kick-down is disengaged