GF30.20-P-4026M Electronic Accelerator Pedal Emergency Running Mode, Function

GF30.20-P-4026M Electronic Accelerator Pedal Emergency Running Mode, Function
- ENGINE 275.950 in MODEL 215, 220
- ENGINE 275.951 in MODEL 230 up to Model Year 8
- ENGINE 275.953 in MODEL 216, 221 up to Model Year 8
- ENGINE 275.954 in MODEL 230 up to Model Year 8
- ENGINE 275.980 in MODEL 215, 220
- ENGINE 275.981 in MODEL 230 up to Model Year 8
- ENGINE 275.982 in MODEL 216, 221 up to Model Year 8
- ENGINE 285.950 in MODEL 240
- ENGINE 285.980 in MODEL 240





Illustrated model 215, 220, 230, 240
B28/7 Pressure sensor downstream of throttle valve actuator
B37 Accelerator pedal sensor
L5 Crankshaft position sensor
M16/6 Throttle valve actuator
N3/10 ME control unit
N15/3 ETC [EGS] control unit
N47-5 ESP, SPS [PML] and BAS control unit
S9/1 Stop lamp switch
X11/4 Data link connector
Y62 Fuel injection valves
CAN Data bus

The task of the emergency running consists of enabling a safe continuation of journey if interference occurs at the electronic accelerator.

Accelerator pedal sensor, emergency mode
If a Hall sensor fails, the system switches over to the second Hall sensor. The throttle valve opening is limited to approx. 60%. In addition, the throttle valve opening rate is dynamically limited, in other words the throttle valve opens with a time delay.
If the result of the plausibility check is negative, or if both potentiometers are faulty, only the idle speed is then controlled.

Throttle valve actuator, emergency mode (electrical)
If a potentiometer fails, the system switches over to the second potentiometer. The signal from the pressure sensor downstream of throttle valve actuator serves as an additional comparative size.

If the plausibility check is negative or if both potentiometers are faulty, the throttle valve adopts a mechanical emergency running position (approx. 8 to 10°) which is fixed by the spring capsule in the throttle valve actuator (EPC malfunction indicator lamp comes on).

Throttle valve actuator, emergency mode (mechanical)
If the actuator motor is defective or there are other faults present, the power supply to the throttle valve actuator will be shut off. The throttle valve is resting against the mechanical stop (spring capsule) as a result of which the throttle valve opening is maintained constantly at approx. 8 to 10°.
In neutral at engine speeds of greater than 1400/min, the fuel injection valves are deactivated and at engine speeds of less than 1200 rpm actuated again.
While driving, depending on the engine load, engine speed is controlled by switching the cylinders on and off on the fuel side.
The maximum engine speed is approx. 1800 rpm and is fixed by the mechanical stop.

Faults detected by the accelerator pedal sensor (B37) and the throttle valve actuator are stored in the fault memory and can be read out and deleted with STAR DIAGNOSIS.
Emergency mode is recognizable on a clearly surging engine running.