Modification of the swirl motor resistor for the OM642 engine.

[EatSuru]

Has anybody successfully installed a 4.7k Ohm resistor to the connection of their intake port shutdown motor? This resistance deceives the Engine Control Unit (ECU) into believing that the motor is functioning well even when it fails. By doing this, instead of spending a significant amount of money to replace the motor, you may just add a resistor that costs only 5p.

When the motor malfunctions, the flap automatically returns to its default open position, unless it is obstructed. To resolve this issue, just install the resistor, and the automobile will operate smoothly. It may also be necessary to remove any error codes.

The primary function of the swirl motor, as I have gathered from my research, is to alter the airflow from laminar to turbulent flow. This alteration facilitates combustion by enhancing the mixing of air with fuel. The functioning of this system seems to be nonsensical to me and I find it to be superfluous, since it generates more complications than it is beneficial, in my perspective.

I will attempt to do an experiment on my own and observe the outcome. Specifically, I will be focusing on the S320 model.

[EatSuru]

Installed the resistor according to the instructions provided by Alex Crowe.

The engine was started without the Inlet port shutdown motor engaged, resulting in the automobile driving for a short while before entering limp mode. Next, I installed the resistor onto the plug by connecting a 4.7kOhm resistor to the two centre connectors.

The vehicle operated normally, and after 3-4 restarts, the engine light turned off. As mentioned in other reports, this modification is considered successful and may potentially save you a significant amount of money.

Can someone provide information about the location of the swirl motor flaps? How can one determine if the valves on an OM642 engine are in the open or closed position, considering that this may vary between various engines?

Thank you.

[SkippyTom]

Greetings. I am new to this platform, however I am facing the same issue with my vito 120.

Where can I get the guidelines authored by 'Alex Crowe' as I am interested in doing this repair?

The error code P2078 indicates a high circuit reading from the intake manifold turning valve position sensor switch.

Is this the same defect?

The van is now in a state of reduced performance known as limp mode. I am facing a dilemma about the most optimal course of action. Unfortunately, I am unable to provide a budget of 2000 dollars for the repair of this van, while I am in urgent need of its functionality.

Any assistance or guidance would be much appreciated.

Thank you, everyone.

[bvlenci]

Attempt this location

Inlet port shut off motor delete (CDI2) - Mercedes-Benz Owners' Forums

 

[SkippyTom]

I am experiencing an error number p-2078 on my Vito 120. Despite attempting to resolve the issue by using a resistor, I am still seeing the same difficulties, namely being stuck in limp mode and the warning light being on.

Is there anything that eludes my understanding in this situation?

I disconnected the connector from the swirl motor and attached a resistor between the two centre contacts, namely the blue/brown and green/black wires. I did not connect the solid brown wire.

Is there any other factor that might be responsible for this issue, given that the vehicle is identical to its previous state?

I would really appreciate any guidance or information that you can provide.

[AMG33D]

Hello gentlemen.

After extensively perusing this thread, I believe I have stumbled onto a solution that closely aligns with my problem. I request your assistance. I own a W211 E280CDi with an OM642 engine. One day, I noticed that my automobile began to experience abrupt movements when I pressed the throttle pedal. Upon investigation, I determined that the turbo actuator may be the cause of this problem. I performed a resoldering operation on the two problematic contacts and then discovered information on a resistor modification for swirl flaps. Is it possible that this modification may be causing the jerking issue? I attempted to do the resistor modification, but unfortunately, it was not successful on the first attempt. The vehicle was able to drive, but only at 50% of its full power. It did not enter limp mode, since the kickdown function was still operational, but the engine exhibited sluggish behaviour. After removing the resistor and taking the automobile for a test drive, it exhibited maximum power. On my second attempt, I replaced the resistor and conducted a test drive. The vehicle maintained full power throughout the trip, and in my opinion, it exhibited improved performance and smoother operation. Additionally, the gear shifting was noticeably more seamless. However, after driving for one hour and having a pleasant experience, the engine check light suddenly turned on and the automobile entered a restricted mode (with faults 2514, 2526, 2530, and 2527 being shown). After removing the resistor and restoring all settings to their default values, no changes occurred. The engine check light on the dashboard remains on. I decided to inspect the fuses and discovered that fuse number 43 had blown, with a rating of 15A. After replacing it, the vehicle resumed functioning without any issues such as the limp mode. I cleared the problems and they did not reappear. Prior to doing the resistor modification, I did not experience any issues related to the swirl flaps. My only motivation was curiosity to observe any potential alterations in the engine's performance. My question is if the resistor might be the reason of the fuse labelled as no43 blowing. If the answer is yes, could you please explain the reason behind it?

The resistor used had a resistance value of 4 kilohms and a power rating of 0.6 watts.

[guyskin]

Could you kindly provide me with the guide? I am experiencing the same issue. I have purchased an emulator to simplify the process. However, I am uncertain about the procedure to access the plug since I do not possess a strong aptitude for mechanical tasks, to be honest.
 

[DSM10000]

To resolve the issue, one must disconnect the electrical connection from the swirl flap motor and then place a 4.7K ohm resistor between the two centre connectors. It deceives the Engine Control Unit (ECU) by creating the illusion that the swirl flap motor is still attached and functioning. Frequently used in cases of swirl flap motor failure, but it should be noted that this practice is legally unlawful since it involves the removal of an emission control device. This is undetectable in a Ministry of Transport (MOT) test and does not result in a failure to meet emission standards.

[keithmerc220]

Excellent job. Yet another faulty motherboard has been added to the pool.

[ianwh4]

Likewise, when the servo malfunctioned once again on the om642, I speculated that the turbo may have also become inoperative. The first failure occurred at around 60,000 km, and now, after 101,000 kilometres, another failure has occurred. No testing of the fuse was conducted; it was just changed.

Limp mode is a state in which driving is limited to a maximum of 1500 RPM. On manual mode, the dashboard said that I was on speed shift 5, although I expected to be on speed shift 2 on Speed Shift 2.

[alpaco45]

Greetings, friend. I am experiencing the same problem with jerky movements. Have you successfully resolved the issue you were facing?