Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
W211 Engine Management Systems
 
Bookmark and Share

Pelican Technical Article:

W211 Engine Management Systems

Nick Czerula

Time:

1 hours1 hrs

Tab:

$10

Talent:

**

Tools:

General tool set

Applicable Models:

Mercedes-Benz E320 (2003-05)
Mercedes-Benz E500 (2003-06)
Mercedes-Benz E55 AMG (2003-06)

Parts Required:

Engine parts

Hot Tip:

Work with a cool engine

Performance Gain:

Understanding your vehicle info

Complementary Modification:

Tune up or oil change

Mercedes-Benz W211 E Class cars (2003 - 2009) are equipped with either gasoline-powered engines with digital engine management or with diesel engines. This article covers the engine management system in gasoline-powered engines:

  • E320, E350 vehicles are equipped with V-6 engine, engine code 112, 3 valves per cylinder
  • E500, E550 vehicles are equipped with V-8 engine, engine code 113, 3 valves per cylinder

The V-6 engine, a first for Mercedes-Benz, was developed in the 1990s. The V-8 engine, based on the V-6, was introduced in the early 2000s. Both V-6 and V-8 engines utilize the ME-SFI 2.0 engine management system. The ME-SFI engine control module (ECM) is programmed with software for control of fuel injection, ignition and other functions.

On-board diagnostics

The Mercedes-Benz ME-SFI engine management system complies with second-generation on-board diagnostics (OBD II) standards. OBD II software and hardware, integrated fully in the engine and engine management, monitors components that influence exhaust and evaporative emissions from the vehicle. Diagnostic trouble codes (DTCs) are generated and stored in the ECM whenever a problem with a component or system is detected. Additionally, a malfunction indicator light (MIL) is illuminated in the instrument cluster. This light is often referred to as the "Check Engine" light.

DTCs and other faults are downloaded for diagnostic purposes by using a Mercedes-Benz Star scan tool or equivalent.

ME-SFI engine control module (ECM)

The ME-SFI engine control module (ECM) is at the right rear of the engine compartment. ECM inputs include:

  • Engine coolant temperature sensor
  • Intake air temperature sensor
  • Mass air flow sensor
  • Driver input from accelerator pedal
  • Oil condition sensor
  • Cruise control
  • Starter switch
  • Transmission control unit (ETC)
  • Fuel tank pressure sensor
  • Intake manifold pressure sensor
  • Crankshaft and camshaft sensors
  • Oxygen sensors
  • Knock sensors
  • ECM output signals include:
  • Ignition coils
  • Fuel injectors
  • Throttle valve actuator
  • Fuel pump relay
  • Exhaust gas recirculation transducer
  • Secondary air injection pump
  • Intake manifold switchover valve
  • Fuel tank breather purge valve
  • Oxygen sensors heaters
  • Engine rpm signal (to speedometer etc.)
  • Starter relay
  • Fault memory
  • Additionally, the ECM communicates via CAN-bus with the following systems:
  • Traction control (BAS / ESP or BAS / ASR)
  • Automatic transmission control (ETC)
  • Sensotronic brake control (SBC)
  • Climate control
  • Brake light switch
  • Instrument cluster

Fuel supply, fuel injection

The electrically operated fuel pump and the integrated fuel pressure regulator are located underneath the vehicle, to the right and forward of the fuel tank. The fuel filter is forward of the fuel pump assembly. Excess fuel from the fuel pump flows through the fuel filter and back into the fuel tank.

The fuel pump supplies high-pressure fuel (approx. 2.5 bar or 36 psi) to the engine fuel rail, which distributes fuel to the electronically actuated fuel injectors. The ECM meters fuel injector output sequentially.

Intake system

An electronically controlled two-stage intake manifold improves low-end and mid-range torque. An ECM controlled vacuum-operated switchover solenoid at the end of the intake manifold is connected to flap valves, which switch between long and short intake runners as needed.

Ignition and knock control

Each engine cylinder is equipped with an ignition coil with two outputs; there are two spark plugs per cylinder. The ECM fires the paired spark plugs simultaneously at lower engine speeds but diverges their timing at higher speeds. This reduces noise, achieves even wear on the spark plugs and prevents one-sided deposits in the combustion chambers.

To prevent engine damage in case of adverse conditions or poor fuel quality, knock (detonation) sensors are mounted on the engine crankcase, in the valley between the two banks of cylinders, underneath the intake manifold. Knock sensors are microphones tuned to the frequency of engine knock (detonation). The ECM monitors knock sensor output for detonation signals and, if detected, responds by changing (usually retarding) ignition timing at one or more cylinders.

Be aware that ignition system voltages may be in the lethal range. To disable the ignition system while engine service or repair is carried out, detach the power supply from the ECM.

Catalytic converters, oxygen sensors

A catalytic converter is installed in each exhaust pipe (after the exhaust manifold) for the left and right cylinder banks. An oxygen sensor is screwed into each exhaust pipe close to the engine. Another oxygen sensor is downstream of each catalyst, underneath the floor. The two pairs of oxygen sensors provide detailed fuel-air mixture information to the ECM, allowing it to regulate exhaust emissions precisely.

Coolant temperature sensor

The compactly designed engine coolant temperature sensor is inserted into the coolant passage in the front center of the engine.

Oil condition sensor

The ECM is supplied with oil condition (oil level, temperature and quality) information by a sensor installed in the oil pan. The ECM in turn communicates this information to the instrument cluster. Oil quality assessment is based on dielectric properties of oil. Oil level measurement is accurate to within 3 mm (1/8 inch).

Secondary air injection

The ECM controls the electrically operated secondary air injection pump. It is placed at the top front of the engine. Plumbing connects it to the front of each cylinder head on the exhaust side.

Exhaust gas recirculation (EGR)

The vacuum-operated EGR valve, actuated by the ECM, allows small amounts of engine exhaust to mix with the intake mixture in order to lower combustion temperature and reduce the engine's nitrous oxide emissions.

The EGR valve with its electric vacuum transducer is installed behind the right bank of cylinders. The ECM actuates the transducer variably as a function of engine speed, engine load, coolant temperature, idle speed or full throttle detection.

Evaporative emission control

An activated charcoal canister stores fuel tank evaporative losses. A purge valve and leak detection system help maintain low evaporative emissions.

In addition, the vehicles are equipped with on-board refueling vapor recovery (ORVR) systems.

The V-6 engine, a first for Mercedes-Benz was developed in the 1990s.
Figure 1

The V-6 engine, a first for Mercedes-Benz was developed in the 1990s. The V-8 engine, based on the V-6, was introduced in the early 2000s. Both V-6 and V-8 engines utilize the ME-SFI 2.0 engine management system. The ME-SFI engine control module (ECM) is programmed with software for the control of fuel injection, ignition and other functions.

On-board diagnostics: The Mercedes-Benz ME-SFI engine management system complies with second-generation on-board diagnostics (OBD II) standards.
Figure 2

On-board diagnostics: The Mercedes-Benz ME-SFI engine management system complies with second-generation on-board diagnostics (OBD II) standards. OBD II software and hardware, integrated fully in the engine and engine management, monitors components that influence exhaust and evaporative emissions from the vehicle. Diagnostic trouble codes (DTCs) are generated and stored in the ECM whenever a problem with a component or system is detected. Additionally, a malfunction indicator light (MIL) is illuminated in the instrument cluster. This light is often referred to as the "Check Engine" light. DTCs and other faults are downloaded for diagnostic purposes by using a Mercedes-Benz Star scan tool or equivalent.

ME-SFI engine control module (ECM): The ME-SFI engine control module (ECM) is at the right rear of the engine compartment.
Figure 3

ME-SFI engine control module (ECM): The ME-SFI engine control module (ECM) is at the right rear of the engine compartment. ECM inputs include:

  • Engine coolant temperature sensor
  • Intake air temperature sensor
  • Mass air flow sensor (red arrow)
  • Driver input from accelerator pedal 
  • Oil condition sensor
  • Cruise control
  • Starter switch
  • Transmission control unit (ETC)
  • Fuel tank pressure sensor
  • Intake manifold pressure sensor
  • Crankshaft sensor
  • Camshaft sensors (yellow arrow)
  • Oxygen sensors
  • Knock sensors

Fuel supply, fuel injection: The electrically operated fuel pump and the integrated fuel pressure regulator are located underneath the vehicle, to the right and forward of the fuel tank.
Figure 4

Fuel supply, fuel injection: The electrically operated fuel pump and the integrated fuel pressure regulator are located underneath the vehicle, to the right and forward of the fuel tank. The fuel filter is forward of the fuel pump assembly. Excess fuel from the fuel pump flows through the fuel filter and back into the fuel tank. The fuel pump supplies high-pressure fuel (approx. 2.5 bar or 36 psi) to the engine fuel rail, which distributes fuel to the electronically actuated fuel injectors (red arrows). The ECM meters fuel injector output sequentially.

Ignition and knock control: Each engine cylinder is equipped with an ignition coil (green arrows) with two outputs; there are two spark plugs per cylinder.
Figure 5

Ignition and knock control: Each engine cylinder is equipped with an ignition coil (green arrows) with two outputs; there are two spark plugs per cylinder. The ECM fires the paired spark plugs simultaneously at lower engine speeds but diverges their timing at higher speeds. This reduces noise, achieves even wear on the spark plugs and prevents one-sided deposits in the combustion chambers. To prevent engine damage in case of adverse conditions or poor fuel quality, knock (detonation) sensors are mounted on the engine crankcase, in the valley between the two banks of cylinders, underneath the intake manifold. Knock sensors are microphones tuned to the frequency of engine knock (detonation). The ECM monitors knock sensor output for detonation signals and, if detected, responds by changing (usually retarding) ignition timing at one or more cylinders. Be aware that ignition system voltages may be in the lethal range. To disable the ignition system while engine service or repair is carried out, detach the power supply from the ECM.

Catalytic converters, oxygen sensors: A catalytic converter is installed in each exhaust pipe (after the exhaust manifold) for the left and right cylinder banks.
Figure 6

Catalytic converters, oxygen sensors: A catalytic converter is installed in each exhaust pipe (after the exhaust manifold) for the left and right cylinder banks. An oxygen sensor is screwed into each exhaust pipe close to the engine, and another oxygen sensor is downstream of each catalyst, underneath the floor. The two pairs of oxygen sensors provide detailed fuel-air mixture information to the ECM, allowing it to regulate exhaust emissions precisely. Sensors: Bank 1 Sensor 1, blue arrow. Bank 2 Sensor 1, red arrow. Bank 1 Sensor 2, green arrow. Bank 2 Sensor 2, yellow arrow.

Secondary air injection: The electrically operated secondary air injection pump (red arrow) is controlled by the ECM.
Figure 7

Secondary air injection: The electrically operated secondary air injection pump (red arrow) is controlled by the ECM. It is placed at the top front of the engine. Plumbing connects it to the front of each cylinder head on the exhaust side.









Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Mon 12/5/2016 02:46:01 AM