Fuel Supply

Electronic Engine Power Control





1 Bracket

2 Connector

• Black, 6-pin

3 10 Nm

4 Throttle Position (TP) Sensor (G79) and Accelerator Pedal Position Sensor 2 (G185)

• Not adjustable

• Remove footwell cover to remove sensor

Function of EPC system

The position of the accelerator pedal is transmitted to the engine control module via two accelerator pedal position sensors (adjustable resistances, accommodated in one housing), that are connected to the accelerator pedal.

The position of the accelerator pedal (driver controlled) is a main input for the engine control module.

Operation of the throttle valve occurs via an electric motor (throttle valve actuator) in the throttle valve control module. This is true across the entire engine speed and engine load spectrum.

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.