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Hi everyone, thank you for your help already.I hope my writing is in the right section.
So the patient is 2004 Mercedes Benz S11 320cdi. Couple of weeks ago it started to shut down itself after running a while after normal start. This happened three times in a row. Later that day car stayed running, but running was very rough. Delphi tester gave one fault code; 2145 - cylinder fuel injector, continous. Running did not get any better whether the injector plug was attached or not. Then I already noticed that temperature gauge moved to normal right after start (in seconds)
Based on fault code we decided to replace the fuel injector. Car sat couple of weeks and when I started to move it to carage for repair, all the symptoms were gone and car was working perfectly normal. I managed to use it for few days and then the symptoms came back - starts normally, temperature gauge needle rises immediately to normal and in a while car shuts down.
I currently don't have the ability to read fault codes using STAR so I hope to get some help on what I could check out of the car. I personally suspect that it would be an electrical failure instead of a fuel injector, because engine temperature increases always occur at the same time as running problems.
The first thing I thought about was checking the ECU connectors, but could someone please tell me if I need to disconnect the battery before doing so? I have understood that disconnecting the battery can cause a lot of problems. Thank you very much.
I checked the ECU connectors and the pins on both connectors looked visually clean, no corrosion. M connector had something of moisture in the seal and on the bottom (see photo). In the picture, the plastic even looks melted but yet I think it's just wet. The liquid was yellowish, a little oily? Could it cause contact problems and described symptoms? Maybe I'll try using compressed air and contact spray now. All the relays looked visually clean.
This is a bit of a monologue, but I still hope someone has some advice. Thank you!
The Fault codes displayed like Pxxxx is named generic faults codes and of course any repairs should be postponed till some details can be revealed based on this generic diagnosis.
Codes like Pxxxx-xx are named Faults Codes where last two digits or letters points the exact nature of the fault, - electric fault, functional, etc
Some Generic scanners has also a dedicated section from where you can select for example 211/om642....and maybe the displayed Fault will be more than a generic one.
Anyway, P2145 is usually related to "open circuit for Injector #5" but could be short circuit as well, anyway I would inspect the injectors connectors ( some times the wires could be like burned).
It seems that the case has come to an end, at least for now. So yesterday I checked all the fuses and relays and the ECU connectors and all were clean. I also cleaned the ECU connectors, but it made no difference and the car didn't even start. I was still disturbed by the increase in engine temperature to 80 degrees, as soon as the currents were turned on, even though the engine was cold.
I decided to disconnect the coolant temperature sensor and there it was, the car started immediately and there were no problems with running!! The runningproblems started as soon as I put the sensor back on. So I changed the sensor in the evening and the car works perfectly, no incorrect temperature rise and no problems with running.
So I think we started to think about it too complicatedly: what causes both the temperature rise and the problems with the injectors? Therefore, attention began to turn to ECU. And it was also hard to believe that just a coolant temperature sensor could cause such difficult problems that the car won't start or keep going and the running is really rough.
Still wondering about the fault code I received related to the injector, is there any chance that a faulty temperature sensor could cause temporary disturbances in the injectors?
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