What causes an ECU fault on a Mercedes a class?

Mercedes A Class ECU & Air Mass/Flow Meter This ECU is a very common fault for the Mercedes A Class, it causes the engine management light to come on and fault code for the Air Mass/Flow Meter to be stored in the ECU’s memory. This fault can cause the engine to run rough and idle poorly.

Are there any fault codes for Mercedes cars?

Mercedes Fault Codes Mercedes Fault codes can be a pain especially the body and chassis control codes.

What are the problems with the Mercedes C class?

The 2011 C-Class has a well-known and highly publicised problem with its steering system. The unresponsiveness and the strange noise are being caused by a problem with your power steering pump and the fluid line. This will usually manifest as a leak.

What to do if your Mercedes has an electrical fault?

One thing to consider when you have an electrical fault with a Mercedes is to ensure that you regularly service your vehicle and do take your car to a Mercedes specialist. On many occasions, we have taken on work from other non-Mercedes workshops due to them not having the experience of either the car or the fault.

What causes an electrical fault in a Mercedes Benz?

Quite often we have seen brittle or broken wires between engine control units and engine parts which can cause these issues. There are also software updates that the engine or gearbox may need in order to cure a running problem. Or a starting problem or even to smooth out gear changes.

What are the common problems with Mercedes diesels?

Here are some common problems that affect many Mercedes-Benz diesel models including E350, ML350, GL350, R350, Sprinter, R320 CDI and BlueTec models. Common problems Diesel Particulate Filter. As Mercedes DPF traps and holds soot, with time it reaches a point when it needs to be ‘emptied out’. This is done by regeneration.

What are the most common Mercedes Benz transmission problems?

Top 5 Mercedes-Benz Transmission Problems. Won’t come out of Park gear due to a defective brake light switch. ( DIY How to replace the Brake Light Switch) Continue to read if you would like to learn how to troubleshoot your Mercedes-Benz transmission yourself and where you should start. 1. Check Fluid Level

How to reset adaptive shifting points on Mercedes Benz?

This procedure will reset the adaptive shifting points in your Mercedes-Benz automatic Transmission Control Unit (TCU). These simple do it yourself instructions take less than 5 minutes. No tools are required to perform this procedure and make your Mercedes-Benz shift like new. Try this if your car has been shifting sluggish recently.

How long does it take to shift a Mercedes Benz?

These simple do it yourself instructions take less than 5 minutes. No tools are required to perform this procedure and make your Mercedes-Benz shift like new. Try this if your car has been shifting sluggish recently. This will make your car fun to drive again, it’s like getting a free tune-up.

Do you need to replace the ignition switch on a Mercedes?

If you do need to replace the key or the ignition switch, then it’s important to make sure that the shop you bring your Mercedes to uses only quality, certified parts that will work best for your specific vehicle.

What causes a Mercedes Benz to not start?

In most cases you will get a fault code related to one of the following: 1 ECM / PCM computer failure 2 Camshaft position sensor 3 Shifter Selector module 4 Fault codes related to driver authorization or immobilizer 5 Electrical problems

What are the problems with a Mercedes Benz?

Top 5 Mercedes-Benz no start problems 1 Engine Click, No Start 2 Engine Dies Right After It Starts 3 Car turns over, but it won’t start 4 The car makes a clicking noise but won’t start. Hint: Starter Problem or Low Battery 5 Key will not turn the ignition More

How old is the battery on a Mercedes Benz?

This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the battery on your Mercedes-Benz? While some MB owners have pushed over 10 years on an original battery, the battery should be considered for replacement around 6 or 7 years.

What’s the fuel pressure on a Mercedes Benz?

A great and affordable gauge that we have used in the past is this Actron Fuel Pressure Gauge which works on Mercedes-Benz cars. Turn the engine off and connect this gauge to the Schrader valve test port shown in the picture below. Start the car and you should be able to get around 60 psi.

What causes the throttle body on a Mercedes to fail?

When there are throttle body malfunctions the wrong amount of air enters into the engine causing problems with air/fuel mixture ratio. Here is a close up picture of a Mercedes throttle body. Mercedes throttle bodies made by Bosch and VDO may fail. Luckily these units are repairable.

Why are my spark plugs not working in my Mercedes?

Failing spark plugs can appear as engine misfires, power loss, decreased acceleration, and trouble starting. If you’ve begun to notice any of these problems in your Mercedes, it is probably time to get some brand-new spark plugs. Luckily for you, we have a huge selection of OEM spark plugs right here at Mercedes Genuine Parts.

When to replace the throttle possition sensor on a Mercedes Benz?

If you determine the throttle position sensor has failed on your Mercedes-Benz you will need to address this problem right away. In most cases, you will get code P0120 or P012x. Your options are to replace it with a new throttle position sensor.

How many spark plugs do you need for a Mercedes Benz?

The NGK Iridium IX not only last longer buy they have been proven to perform very well on Mercedes-Benz engines. NOTE: Mercedes-Benz cars typically have two spark plugs per cylinder. For example, an E320 which has a 6 cylinder engine requires 12 spark plugs.

How many volts does an ECU usually have?

Then you will have a malfunctioning ECU. The average ECU is expected to have at least 9 volts, but preferably 12 volts. There is wiring that runs into the harness of the ECU where you can check the voltage amount.

What should the idle voltage be on a MAP sensor?

The technician must verify that the voltage output of the MAP sensor is correct and fluctuates with the engine speed and proper voltage. Idle voltage is normally 1 to 1.5 volts and full throttle is usually around 4.5 volts. Do not buy a new MAP Sensor or ECU unless it is clearly at fault. How serious is the P0106 code?

Is the ECU the same as the transmission?

In the Automotive industry, the term ECU often refers to an Engine Control Unit (ECU), or an Engine Control Module (ECM). If this unit controls both an engine and a transmission, it is often described as a Powertrain Control Module (PCM).

What is the reference voltage of the MAP sensor?

The MAP sensor reference voltage or signal is equal to the car battery voltage. Check for short circuit in the wire, connected to the positive terminal of the car battery, or in the wire which turns on and off the power supply.

What is the signal level when the engine is not running?

Initially the engine is not yet running and the signal level is around 4.5 V. This signal voltage corresponds to the pressure in the inlet manifold. As the engine is not running yet, this pressure is equal to the outside air pressure.

Which is an example of an ECU sensor?

This typically includes temperature and pressure sensors, on/off signals and data from other modules within the vehicle and is how an ECU collects the information it needs to make decisions. An example of an input would be a Coolant Temperature sensor, or an Accelerator Pedal Position sensor.

What is the fault code for Mercedes C class?

Common fault codes: P1856 – Selector Lever Position Detection Failed; P240C – CAN Signal Selector Lever Position N15/5 Is Not Plausible Affected Vehicles: Mercedes A-Class 2004 – 2012 (W169) Mercedes C-Class 2005 – 2009 (W203 and pre-facelift W204) Mercedes CLK 2005 – 2009 (C209/A209) Mercedes CLS 2005 – 2009 (W219)

What causes a fault code on the ECU?

This will also cause fault codes to be stored for turbine speed sensors and RPM sensors. This 2 nd generation 7G-Tronic conductor plate / TCM will cause gears to stick or simply prevent any gear selection at all, leaving you with an undriveable vehicle and a ‘Transmission Malfunction’ message on the dashboard…

Are there any problems with Mercedes Benz ECU?

When i plug a diagnostic tool in it tells me it cannot communicate with the ECU . There is no warning or ECU lights on the dashboard when trying to start . I have checked all the wires and have not found a broken wire anywhere .

Why does my Mercedes zgw control module not work?

Mercedes-Benz Central Gateway Module ZGS (also referred to as CGW) may fail, causing various warning lights or systems to stop working. Mercedes Central Gateway module is the hub that allows communication between various modules. Mercedes ZGW Gateway control module stores data for Mercedes ASSIST or ASSYST plus.

Can you do SCN coding on Mercedes star scanner?

SCN Online Coding: Unless you buy the scanner from the official Mercedes-Benz source, you will not be able to perform SCN coding of control units. That’s because Mercedes Star Diagnostic scanner will try to connect to Mercedes-Benz database for verification of SCN code in order to program certain control units.

What does scan tool mean on Mercedes Benz?

Scan Tool The term “scan tool” is used to refer to any tool that communicates directly with the vehicle data stream. When necessary, the term “Scanner” is used to distinguish Snap-on equipment from another diagnostic device, such as the Mercedes-Benz factory scan tool. 1.2 Notes and Important Messages

What is the Mercedes-Benz vehicle communication software manual?

Chapter 2Introduction The Mercedes-Benz Vehicle Communication Software provides extensive vehicle-specific engine, transmission, antilock brake system (ABS) and airbag trouble codes, and selected functional tests. This manual is designed to guide you through control systems tests of Mercedes-Benz vehicles.

What is the Mercedes Benz engine control unit number?

We do our very best to stock every possible engine control unit for most late model Mercedes Benz cars and trucks. Some of the most popular ecm’s we sell are 2000, 2002, 2003 and 2004 C class and 2005 E320 models. The 2007 S550 ecu is also a popular item. Part number A2731535079 and A2731535679 are both popular S550 replacements.

Do you have to flash a Mercedes ECM?

This step is required on all Mercedes, both cars and trucks. Whenever a late model Mercedes Benz ecm is replaced with a new or rebuilt unit the computer will have to be flash programmed with VIN specifications or the vehicle will not start. The service we offer eliminates expensive dealership prices and streamlines…

What is the OBD2 code for a cooling fan?

P0480 is a general OBD2 trouble code that refers to the a malfunction within the cooling fan control circuit. This code is similar to P0481 and P0482 codes.

How to find the Mercedes engine error code?

The table shows the error codes for the Mercedes engine. To find a word or phrase on the page, press Ctrl + F in the window that appears, enter the error code or part of the phrase and click the “Find” button, as a result, the decoding of the specific Mercedes error code you are interested in will appear.

Why does my engine not Rev past 3000 rpm?

The glow plugs only purpose is to help with emissions control, they have no real bearing on how your engine runs wether they’re working or not. Your going to have to take it to a garage I’m afraid. The good news is that there will definately be a fault code to point you in the right direction, but to get the code, it’s garage time.

What causes ABS warning light on Mercedes W204?

This fault can cause the engine to run rough and idle poorly. Common ABS pump and module failure for C-Class W204 range will cause the ABS warning light to illuminate and store fault codes for ‘internal fault’

What causes a back light to go out on a Mercedes?

Complete loss of back lighting. We are currently rebuilding customers own units with an unlimited mile warranty, this is a very common failure for the Mercedes S & E Class instrument cluster. This is a common problem causing the “F” light to appear on the dash and the gears feel as though they are banging in to place…

Can a Mercedes Benz e300td CLK320 be changed?

Changing the cabin air filter in your CLK-Class is literally a snap with our handy replacement guide. Everything you need to know to replace the fuel injectors in your CLK320 is outlined in this technical article. The fuel sending unit in your E300D can sometimes fail, but do not fret!

What are the different types of Mercedes Benz warning lights?

Click a link to learn more about each one. They are roughly ordered by importance, which tends to be by color (red, amber, yellow, orange, green, blue, gray), but there are over 40 of them so be patient! Models examined include AMG, B, C, CLA, CLS, E, G, GL, GLA, GLC, GLE, GLK, GLS, GT, M, S, SL, SLC and SLS Class and Series vehicles.

Where are the fuses located on an E420?

The fuse boxes shown below are apply to 1996 1997 1998 1999 2000 2001 2002, models E320 E420 E430 E55 AMG. The main fuse box is located on the left side in the engine compartment near the windshield. Here is a layout of the fuses in the main fuse box. Fuses in the auxiliary fuse box located on the side of the dash.

Where is the fuse box on an E class?

E Class (1996-2002) W210 Fuse Box Chart Location Designation Diagram Function Fuse number ABS/ESP 19, (11)* Adjustable mirror, driver’s side 16, (3)* Adjustable mirror, passenger side (1,3)* Adjustable steering column (8,9,13,14)*

How do you remove the instrument cluster on a Mercedes W210?

The instrument cluster on the Mercedes W210 chassis simply pushes into the dashboard. You remove it by using two picks in the area shown here (green arrows). As the cluster is removed, you can see the gated part of the cluster on the side where the picks fit into the sides of the cluster (green arrow).

Is the Mercedes E 3230 available for free?

Every Manual available online – found by our community and shared for FREE. Enjoy! The Mercedes-Benz E-Class is a range of executive cars manufactured by Mercedes-Benz in various engine and body configurations produced since 1992. The Mercedes-Benz E 3230 was produced in several versions since 1993.

Do you get email when new Mercedes E 320 is added?

We’ll send you a quick email when a new Mercedes E 320 document is added. Spam free, max one email a month. Never miss out: Get notified when new Mercedes E 320 documents are added. Yes! I’d love to be emailed when a new, high quality document is available for my Mercedes E 320.

Where are the transmission codes stored in a Mercedes?

Specific codes related to the transmission are stored in the TCU (Transmission Control Unit) and come generic codes such as P0705 are stored in ECU (Engine Control Unit). You don’t need to pay anyone to read the codes; you can retrieve them yourself in a couple of minutes with the right OBD II scanner.

Can you read the fault code on a Mercedes Benz?

Can read fault codes from multiple systems such as transmission, engine, ETS, airbag and more. Can clear fault codes. Can read and erase all fault codes on Mercedes-Benz cars. Only works on MB but can perform further troubleshooting including SBC brake systems, convertible systems, Air Conditioner (A/C) system. 3. Mercedes-Benz Star Diagnostic DAS

Is there a climate control code for a 1994 e320 wagon?

1994 E320 Wagon,1999 E320 Wagon,2000 E 320 Wagon, MGB Track/Rally, ,1988 300E ,more…. has it seriously wrong.You can only clear climate control codes in the climate control diagnostic section.

How do you delete error codes on Mercedes Benz?

Push right AUTO button and see if there are any errors (like b1416 on the left). If there aren’t any it should display FF (in deutsch – Fahler Frei (No Errors)). You can search through the list by pressing the AUTO buttons. You can ALSO DELETE ERRORS by PRESSING SIMULTANEOUSLY BOTH AUTO buttons.

What causes ESP light to illuminate on Mercedes E-class?

This is a common problem with the E-Class. In some cases, the gear shifter can cause the ESP light to illuminate if liquid gets spilled on the shifter. Mercedes C-Class W203 W204 ESP light -ESP light on a C-Class is typically caused by a defective brake light switch or low battery voltage.

Are there any problems with Mercedes Benz E320?

Mercedes Benz E320 owners have reported 93 electrical system related problems since 1996. Table 1 shows the 17 most common electrical system problems. The number one most common problem is related to the vehicle’s electrical system (38 problems). The second most common problem is related to the vehicle’s wiring (23 problems).

Are there any electrical problems with a Mercedes Benz?

Recently we have been working on a Mercedes-Benz with some major and unexplainable electrical issues. The problem started with the Keyless Go feature. The key would unlock the car via keyfob and start it by inserting the key in the ignition. But Keyless Go stopped working.

Are there any problems with Mercedes Benz COMAND system?

We have listed down common issues with the Mercedes-Benz COMAND system, including problems with The most common solution to fix any of these issues is to try to perform a soft reset of the COMAND unit.

What causes battery to die on Mercedes medic?

A defective electrical system, Control Unit or a fault on the CAN Bus (Controller Area Network) are also causes that can cause your Mercedes-Battery battery to die. To troubleshoot the current draw, you need a multimeter that can perform current reading.

Where is the fan controller on a 2003 A4?

The 2003 A4 uses a J293 – Coolant FC (Fan Control) Control Module to control the electric cooling fan, it is located above the electric fan. This controller does not have diagnostic capabilities and does not communicate with VCDS.

What causes a 7g Tronic control module to fail?

This 7G-Tronic control module is a very common failure that causes a jerky and slow gear change or a complete failure to select gears. This will also cause fault codes to be stored for turbine speed sensors and RPM sensors.

How to troubleshoot an electric cooling fan problem?

1.Has the Cooling Fan Actually Failed? 1 If the fan comes on when the AC is running at MAX, but doesn’t run when the engine is hot, check the temperature sensor… 2 If the fan fails to come on, first check for a fan blown fuse or triggered breaker. On older vehicle models, you may… More

What to do if you have a cooling fan problem in your BMW?

If you notice a problem with your cooling fan module in your BMW, bring your vehicle into one of our experts to have the issue examined and repaired as quickly as possible. Whether it is a fuse, the motor, or the entire module, our experts can get you the replacements you need and have you back on the road quickly.

What happens when a car cooling fan is not working?

When your cooling fans don’t function, they simply won’t operate. This can lead to your vehicle overheating, especially when it is sitting still. If you are stopped and there is no forward motion by your vehicle, it means that air is not passing over your radiator.

What should I do if my radiator fan is not working?

A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan. The fan itself often uses a big fuse of around 50A, while there might also be a separate small fuse to the fan control module.

Why does my Mercedes Benz CDI say start error?

A common issue with Mercedes-Benz diesel ( CDI) vehicles is the erroneous synchronisation between the engine control unit and the immobilizer system. This affects primarily the systems EDC15C0 (CDI1) as well as EDC15C6 (CDI2). If this is the case, the instrument cluster will indicate “Start Error” in older models, as well as in commercial vehicles.

Why is the EPC message stuck on my CDI?

Carsoft diagnostics had revealed DTC errors P2024 and P2001. The first was related to the exhaust gas recirculation valves, one of which we found to be stuck. However, after cleaning them the remaining fault is P2001, which still happens intermitently with the engine dying and the EPC message in the dash.

How is the ECU dependent on the drivetrain?

The engine and drivetrain are the most dependent on the ECU. Through a numerous array of electronic sensors, chips, and components within the vehicle, the ECU can transmit data feedback to the engine. The nature of this feedback will determine which function the engine will perform next.

What is the ECU in a car called?

The ECU is the engine control unit of your vehicle. It is also often referred to as the PCM (powertrain control module) or ECM (engine control module). This electronic module is a built-in computer which your vehicle depends on for managing a variety of its systems and functions.

What’s the difference between ECM and PCU in a jeep?

The Jeep Engine Control Module, known as the PCM ( Powertrain Control Module) ECU ( Electrical Control Unit ) or to simply it put the Automotive Engine Computer . Confusing right? If you would like to know more about their differences you can read up on our previous post ” Difference between ECM, ECU & PCM ” which we covered it in details.

How do you reset the ECU on a Mercedes Benz?

Once both windwos are all the way down make both swithches click by pressing them all the way down. This lets the ECU learn that that is the end of the window track and it records it in memeory. Do the same closing the windows by holding both switches and making them click once the windows are all the way up.

Where can I find the Mercedes Fault code?

Any of the scanners listed above can read and clear the Check Engine / Service Engine Fault Codes. The codes above are retrieved by plugging a diagnostic scanner into the OBD-II port located under the dash, and scanning for fault codes. Location of OBD II port used to retrieve Mercedes-Benz fault codes.

What does ECU 128 mean on a truck?

There is no charge for this service, but standard message and data rates may apply. It means that the engine ECU has a code in it. ECU 128 only identifies the module, it is not a fault code. Can you hit a dash button and get more numbers?

Can you reset the ECU on a Mercedes C class?

Modern cars like the Mercedes-Benz C-Class “learn” your particular driving style over time and miles driven. For those who have acquired a used car and want it tailored to their own driving style, or those who just simply want to start over, resetting the ECU (engine control unit) is a good way to go.

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