Electronic accelerator function - GF30.20-P-3015MI

WARNING: This page is about a different car, the 2012 Mercedes-Benz C300, 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 272.9 (except 272.98) in MODEL 204.0 /2 as of model year 2009 /AEJ 08

ENGINE 272.9 (except 272.98) in MODEL 204.9, 207.3 /4, 212.0 /2

ENGINE 273.9 in MODEL 207.3 /4, 212.0 /2

Function requirements for the electronic accelerator, general points

Circuit 87M ON (engine control ON)
Engine running

Electronic accelerator, general points

The electronic accelerator function (EFP) is integrated in the ME-SFI [ME] control unit (N3/10), and controls the opening angle of the throttle valve according to driver requests and operating conditions. The ME-SFI [ME] control unit regulates the throttle valve position according to the following sensors and signals:

Accelerator pedal sensor (B37), accelerator pedal position
Front SAM control unit with fuse and relay module (N10/1), reverse travel signal from backup lamp switch (S16/2) via the chassis CAN (CAN E) (for a manual transmission)
Electronic Stability Program control unit (N30/4) or Electronic Stability Program Premium control unit (N30/7) (for DISTRONIC PLUS), brake actuation via the chassis CAN
Electronic Stability Program control unit, request for cruise control via the chassis CAN (for cruise control)
Radar sensors control unit (N62/1), DISTRONIC request via the chassis CAN (for DISTRONIC PLUS)
Clutch pedal switch (S40/3), clutch operation (for manual transmission)
Fully integrated transmission control controller unit (Y3/8), gear range via the drive train CAN (CAN C) (for an automatic transmission)
Fully integrated transmission control controller unit, reverse travel signal via the drive train CAN (for automatic transmission)

The requirements of the torque coordination function are also taken into account.

Function sequence for electronic accelerator

The function sequence is described in the following steps:

Function sequence for throttle valve actuation
Function sequence for throttle valve damping
Function sequence for reverse travel
Function sequence for adaptive accelerator pedal

Function sequence for throttle valve actuation

Depending on the accelerator pedal sensor, the ME-SFI [ME] control unit actuates the throttle valve actuator (M16/6) according to a performance map. To do this, the ME-SFI [ME] control unit operates the actuator motor (M16/6m1) in the throttle valve actuator with a pulse width modulated signal (PWM signal). Provided there are no limiting functions active (for example, cruise control request), the opening angle of the throttle valve is determined by the accelerator pedal position alone. The actual value potentiometers 1 and 2 (M16/6r1, M16/6r2) report the current throttle valve position to the ME-SFI [ME] control unit.

Function sequence for throttle valve damping

The ME-SFI [ME] control unit controls the throttle valve damping according to the following sensors and signals:

Accelerator pedal sensor, accelerator pedal actuation (fast, slow)
Crankshaft Hall sensor (B70), engine speed
Coolant temperature sensor (B11/4)
Throttle valve positioner, throttle valve position
Electronic Stability Program control unit, vehicle speed over the chassis CAN

The purpose of throttle valve damping is to delay closing of the throttle valve down to idle speed range if the accelerator pedal is suddenly released. In this way, the engine torque reduces slowly and the vehicle does not slow down with jerks.

Function sequence for reverse travel

If the ME-SFI [ME] control unit receives the reverse travel CAN signal, the ME-SFI [ME] control unit opens the throttle valves slowly and limits the maximum opening angle to about 50%. This optimizes ride comfort and driving safety when reversing.

Function sequence for adaptive accelerator pedal

The ME-SFI [ME] control unit recognizes how the accelerator pedal is being actuated and switches between characteristic curves. After a 50% pedal travel, about 80% of the engine load is released for a sporty driver and 40% of the engine load is released for a quiet driver. There is no further difference felt above a pedal travel of about 90%.

If the calm driver characteristic is active (for example, after a long journey on the freeway), the accelerator pedal at first has to be pressed unusually far in order to obtain high acceleration.

Further functions which support the electronic accelerator and which are described in other sections are:

Engine speed control
Cruise control (if cruise control installed)
DISTRONIC PLUS (for DISTRONIC PLUS)
Torque coordination
Engine limp-home mode

Electrical function schematic for electronic accelerator	Model 204	PE30.20-P-2050-97FAC
	Model 207	PE30.20-P-2050-97EAB
	Model 212	PE30.20-P-2050-97DAB
Component description for ME-SFI [ME] control unit	N3/10Engine 272	GF07.61-P-6000MI
Component description for ME-SFI [ME] control unit	N3/10 Engine 273	GF07.61-P-6000ML
Component description for front SAM control unit with fuse and relay module	N10/1 Model 204.0/2/9	GF54.21-P-6070CE
	N10/1 Model 207.3/4	GF54.21-P-6070CA
	N10/1 Model 212.0/2	GF54.21-P-6070FL
Component description for Electronic Stability Program control unit	N30/4 Model 204.0/2/9	GF42.45-P-5119CE
	N30/4 Model 207.3/4 without code (233) DISTRONIC PLUS N30/7 Model 207.3/4 with code (233) DISTRONIC PLUS	GF42.45-P-5119CA
	N30/4 Model 212.0/2 without code (233) DISTRONIC PLUS N30/7 Model 212.0/2 with code (233) DISTRONIC PLUS	GF42.45-P-5119FL
Component description for radar sensors control unit	N62/1 Model 207, 212 without code (233) DISTRONIC PLUS	GF30.30-P-3301FL
Component description for fully integrated transmission control unit	Y3/8n4 Model 204.0/2/9	GF27.60-P-5165AHW
	Y3/8n4 Model 207.3/4	GF27.60-P-5165AHC
	Y3/8n4 Model 212.0/2	GF27.60-P-5165AHL