Electronic accelerator pedal emergency running mode, function - GF30.20-P-4026AM

ENGINE 113.990 in MODEL 211, 219 

ENGINE 113.991 in MODEL 215, 220 

ENGINE 113.992 in MODEL 230 up to Model Year 2008 

ENGINE 113.993 in MODEL 463 up to 31.5.12 

ENGINE 113.995 in MODEL 230 up to Model Year 2008 

The task of the electronic accelerator emergency mode consists in ensuring that the car can be continued to be driven safely even in case of any faults in the electronic accelerator system (EA).

Accelerator pedal sensor emergency running 

If a Hall sensor fails, the system switches over to the second Hall sensor. The throttle valve opening is limited to about 60 % of the maximum opening. In addition, the speed at the which the throttle valve opens is dynamically limited (throttle valve opens with a delay).

If the plausibility check is negative or if both Hall sensors fail, only idle speed is then still controlled.

Emergency mode in the event of failure of the throttle valve potentiometer 

If one potentiometer fails, the system switches over to the second, intact potentiometer. If both potentiometers are faulty, the throttle valve is brought to the emergency mode position of approx. 10° opening angle by the spring capsule.

Emergency mode in the event of failure of the throttle valve actuator 

The throttle valve actuator is switched in denergized status and the throttle valve is brought to the emergency mode position of approx. 10° opening angle by the spring capsule.

Engine speed control with throttle valve in emergency mode position 

In the idle speed range, engine speed is controlled to about 1200 rpm by shutting off and switching on the cylinders on the fuel side.

While driving, depending on the engine load, engine speed is controlled to about 1800 rpm by switching the cylinders on and off on the fuel side. In doing so, the maximum engine speed is determined by the throttle valve emergency mode position.

Input signals for deactivating and switching on the cylinder (injection valve shutoff) are:

• Engine speed
• Brake detection (via the ESP control unit)
• Drive position (via the ETC [EGS] control unit)

Faults detected by the accelerator pedal sensor and the throttle valve actuator are stored in the diagnostic trouble code memory and can be read out and deleted with the STAR DIAGNOSIS.

If the brake pedal is operated, this always means idle speed input.

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