A pessimist sees the difficulty in every opportunity;
An optimist sees the opportunity in every difficulty.
(Winston Churchill)
Oh my god, this stupid rain, does he never stop? Or - I have so many ideas anyway what I could tinker so much, since the time-out comes just right. Well, how you take it ...
Everything started with this break-out box. The Mercedes service documents describing quite nicely how to check the signals at the control units in order to find a failure.
This is unfortunately only possible with this magic box, as there is no alternative way to access the pins of the control modules.
Now, such an original box is a pretty rare and therefore very costly affair. On the other hand, also a primitive thing with a few sockets and a housing around it. Easy job, isn't it? Yes, if you could have access to the connectors for the various control units. As they are not available in the store, to build such a box is quite challenging task.
Recycling old control units and home made solutions, I built the necessary adapters for the injection control unit, idle control unit and the fuel pump relay.
After the rain still had not stopped, I continued with the construction of a monitor and simulator for the OČ probe. This nice box can display the probe voltage, change the voltage manually or automatically by an built-in signal generator. I described the usage of this box in this video.
A look outside - yes it still rains. After playing around with the electronics, I felt like doing something mechanical. That's why I designed and manufactured a plug for the diagnosis socket X11. Due to the high initial effort, I decide to build a series of these connectors.
Once it had not rained for a day, I bought two used Bosch engine tester with an built-in ingnition scope - totally at the other corner of the republic. Usually a fine thing, but the two devices were getting old - incomplete and partly broken.
I was able to repair the defective digital displays without any schematics. The missing ignition timing lamp and the missing pliers I could acquire in a very pleasant contemporaries in Hamburg - had a lot of fun doing business with him.
Now, however, it went to the test and adjustment of the two devices. For this I needed both - service documents and a suitable signal generator, which could produce all the necessary signal for the engine tester and has to be also freely adjustable. This does not exist, you have to build it by yourself! The result was a infernal device, just have a look into the video.
It turned out during the test that two defective potentiometers had to be replaced to adjust the two devices correctly.
And by the way, the rain stopped meanwhile...
