Accelerator Pedal Unit

Accelerator Pedal Unit







The accelerator pedal unit, which is familiar from the Cayman S (987) and the 911 Carrera (997), incorporates the pedal itself, kinematic mechanism with friction element, metal plate, spring assembly, pedal stop and the printed circuit board. On Tiptronic vehicles, the accelerator pedal unit additionally features a spring-loaded aneroid diaphragm (3) for kickdown simulation. The integrated pedal stop eliminates the need for a basic kickdown setting. Electronic gas pedal sensors 1 and 2 are located on the circuit board (A) of the accelerator pedal unit.

The electronic pedal sensor operates in non-contact mode (according to the induction principle) and is thus wear free. The sensors on the PC board (A) are inductively activated by a metal plate. The supply voltage for the pedal sensor is 5 V. The pedal sensor supplies the signals 'pedal position 1' and 'pedal position 2'. The respective signal voltages are comparable to the signal from previous potentiometers 1 and 2 which are supplied to the Motronic control unit as input signals.

NOTE: The accelerator pedal unit must not be opened.

Power Supply In The Area Of The Motronic System

The Motronic control unit is located in the rear luggage compartment, on the left at the partitioning panel separating the luggage compartment from the engine.

Fuses for the area of the Motronic system are installed at the following locations:







- Fuse carrier on in left footwell
- Relay carrier 2 (slot 6) at left of rear luggage compartment.
- Power distributor







Relays for the area of the Motronic system are installed on relay carrier 1in the footwell.







Relay carrier 2 is located in the rear luggage compartment on the left.

Starting The Engine

In order to start the engine it is necessary, after the ignition key has been identified, to press the clutch pedal (vehicles with manual transmission) or the brake pedal (Tiptronic vehicles). In Tiptronic vehicles, the selector lever must additionally be set to either "P" or "N".

CAN Networking

As in the Cayman S (987) and 911 Carrera (997), electronic networking facilitates the exchange of data and electronic information between the various control units throughout the vehicle via the internal high-speed network, the CAN-BUS (Controller Area Network).

CAN Communication For The Motronic Control Unit

Via the CAN, the Motronic control module communicates with the following control modules:
- Gateway control unit
- Driver authorization controller
- Tiptronic control unit
- PSM control unit
- Steering angle sensor
- Yaw velocity sensor
- Airbag control unit
- Air conditioning control unit