Kickdown Switch
Kickdown functionT5: The kickdown switch, located under the accelerator pedal, provides information to the transmission control module, on pin 37, when the accelerator has been fully depressed. When fully depressed, the accelerator pedal activates the kickdown switch and puts 0 V (ground) on pin 37.
T7: Trionic has a pedal position sensor that provides information on the position of the accelerator pedal. When the angle of the pedal exceeds a predetermined value, the Trionic sends the information "KICKDOWN ON" over the bus, value ON/OFF.
All variants: The control module uses the signal to control the shifting points so that maximum performance is obtained. The kickdown function is available in all shifting programs.
Kickdown function, not connected to bus
Component Diagram:
Kickdown function, connected to bus
Diagnostics
A diagnostic trouble code will be generated primarily in Trionic if the function is faulty.
When bus communication with Trionic ceases, diagnostic trouble code P1921 is generated and the transmission goes into limp-home mode.
Wiring diagram, kickdown function not connected to bus
Wiring diagram, kickdown function connected to bus
Incorrect information on the bus will generate diagnostic trouble code P1971. TCM may go into emergency operation mode (limp-home mode) depending on the fault.