The PCM is located in the resonance chamber in the left-hand front wing.
The PCM monitors and processes the input signals from the sensors and compares these with stored parameters.
Using this information, the PCM calculates the output signals for triggering the actuators.
A diagnostics check can be carried out on the PCM via the DLC using WDS.
Intake manifold valve stepper motor
The stepper motor of the intake manifold valve is actuated by the PCM using pulse width modulation.
Depending on the driving situation, the volume air flow drawn in is varied in accordance with the position of the intake manifold valve and thereby influences the composition of the recirculated exhaust gas.
Its other function is to ensure the engine does not run on when it has been switched off.
MAP sensor
The MAP sensor is attached to the housing of the intake manifold valve behind the intake manifold valve.
The signal from the MAP sensor is used to control the boost pressure of the variable turbocharger.
If the actual value differs from the target value stored in the PCM, the PCM will initiate an adjustment operation by means of the boost pressure control solenoid valve.
EGR stepper motor
The EGR stepper motor is attached to the cylinder head on the engine exhaust side and regulates the quantity of recirculated exhaust gas.
The EGR stepper motor is driven by the PCM using pulse width modulation.
The use of an EGR stepper motor enables the quantity of recirculated exhaust gas to be metered very accurately.
Combined IAT sensor and MAF sensor
The APP sensor is a double contactless inductive sensor.
For safety reasons, the APP sensor consists of two sensors.
If the APP sensor malfunctions when the vehicle is in operation, a fault code will be stored in the PCM.
If one of the sensors of the APP sensor fails then the engine runs with reduced power. However, it is still possible to reach top speed.
If the vehicle is equipped with a driver information system, the fault message: "REDUCED ACCELERATION" will be displayed.
If the APP sensor fails completely then, after a single operation of the BPP switch and the stoplamp switch and a subsequent comparative plausibility test, the engine is regulated to a maximum engine speed of up to 1200 rev/min. The vehicle can be accelerated to a maximum speed of 56 km/h.
If the vehicle is equipped with a driver information system, the fault message: "LIMITED TOP SPEED" will be displayed.
If the vehicle is not fitted with a driver information system, the engine system fault warning light will come on to indicate a system fault.
Solenoid valve - boost pressure control
The fuel metering valve is located in the feed port between the fuel transfer pump and the high-pressure pump elements.
The fuel metering valve regulates the supply of fuel to the high-pressure pump elements, depending on the engine operating conditions.
The fuel metering valve is adjusted by the PCM using pulse-width modulation.
The fuel metering valve is closed when de-energised.
Fuel pressure sensor
The fuel pressure sensor is located at the side on the fuel rail and measures the fuel pressure in the fuel rail.
The signal of the fuel pressure sensor is used by the PCM as in input variable for calculating the injected fuel quantity and the start of injection.
The fuel pressure sensor contains a piezoelectric element that sends a variable voltage signal to the PCM, as a function of fuel pressure.
Fuel temperature sensor
