Throttle valve actuator, detailed information

P07.61-A005-79

Overview

This document contains information on:

 Location

 Task

 Function

Location

The throttle valve actuator is located upstream of the intake manifold in the intake air system.

Task

The throttle valve actuator regulates the following functions:

 Idling speed

 Driving mode (according to accelerator pedal position and engine load)

 Cruise control function

 Electronic accelerator pedal emergency running mode, function

In a deenergized state (e.g limp-home mode), the opening angle of the throttle valve is determined by the return spring (limp-home position).

The throttle valve actuator checks its return spring at "Ignition ON" under the following preconditions:

 Gear range "P" or "N" engaged

 Vehicle at rest

 Engine not in operation

 Coolant temperature between  5 °C and 100 °C

 Accelerator not operated

The combustion engine control unit adapts the throttle valve actuator the first time that the throttle valve actuator is connected to the on-board electrical system.

P07.70-A025-71

Function

The throttle valve actuator motor adjusts the opening angle of the throttle valve continuously from approx. 0 °C to 90 °C depending on the presets from the combustion engine control unit.

The contrary actual value potentiometer 1 and actual value potentiometer 2 inform the combustion engine control unit of the position of the throttle valve.

The potentiometer of the throttle valve actuator is adapted within approx. 60 s of the initial actuation (ignition ON). The following takes place:

 Identified limp-home position

 Identified lower mechanical end stop of throttle valve

 Adaptation of the actual value amplifiers (signals from actual value potentiometer 1 and signals from actual value potentiometer 2) in the combustion engine control unit

 Checking the return spring

 The throttle valve actuator potentiometer can be adapted manually using the XENTRY Diagnosis COM Kit.