Touareg V8-4.2L (AXQ) (2006)
The throttle valve is operated by the throttle drive according to the instructions of the Engine Control Module (ECM).
With engine at standstill and ignition switched on, the Engine Control Module (ECM) activates throttle valve actuator precisely according to the
specifications of the Throttle Position (TP) Sensor. This means, if the accelerator pedal is depressed half way, the throttle drive opens the throttle
valve to the same degree; i.e. throttle valve is then opened approx. half way.
With engine running (under load) the engine control module can open and close throttle valve independently of accelerator pedal position sensor.
That way e.g. the throttle valve can already be completely opened, although the accelerator pedal is only depressed half-way. An advantage of this is
that throttle losses at the throttle valve are avoided.
Aside from that, it results in clearly better pollutant output and consumption values under certain load conditions.
The necessary engine torque can be produced by the engine control module (ECM) via the optimal combination of throttle valve profile and charge
pressure.
The Engine Control Module (ECM) calculates after evaluation of torque requirements of the different components (e.g. A/C system, automatic
transmission, ABS/ESP, etc.) a throttle valve opening angle optimal for the respective situation.
Observe safety precautions.
Observe rules for cleanliness.