Electronic accelerator pedal emergency running mode, function - GF30.20-P-4026SM
ENGINE 113.986
ENGINE 113.987
ENGINE 113.988
ENGINE 113.989
The task of the 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.
Accelerator pedal sensor, emergency mode (B37)
If one 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 if the actuator potentiometer fails (throttle valve)
If one potentiometer fails, the system switches over to the second, intact potentiometer. If both potentiometers fail, the throttle valve is then moved by the restoring spring in the actuator to mechanical emergency running position (M16/6 approx. 10° opening angle).
M16/610
Emergency mode if the actuator or the actuator motor (throttle valve) is faulty
In both cases, the actuator is switched in de-energized status and the throttle valve is moved into the mechanical emergency running position by the return spring (approx. 10° opening angle).
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.
In drive operation, the engine speed is controlled according to the load of the engine through fuel side cylinder cut-out and cut-in up to approx. 1800/rpm. The maximum engine speed is given by the mechanical stop.
Input signals for switching the cylinders on and off (injection valve shutoff) are:
- Speed of crankshaft position sensor (L5)
- Brake detection from ESP and BAS control unit (ESP, PML and BAS) (N47-5)
- Driving stages from the ETC [EGS] control unit (N15/3)
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.
| Fuel injection valves, component description | Y62 | GF07.03-P-6010SM | |
| Crankshaft position sensor component description | L5 | GF07.04-P-6010SM | |
| ME-SFI [ME] control unit component description | N3/10 | GF07.61-P-6000SM | |
| Accelerator pedal sensor, component description | B37 | GF30.20-P-2010SM | |
| Component description of throttle valve actuator | M16/6 | GF30.20-P-2020SM | |
| Stop lamp switch component description | S9/1 | GF42.10-P-2010SM |