mercedes c220 w202 1997 doesn't crank or start.

Cuboy

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Hello,

I recently got a 97 c220 from my uncle.

He was trying to go somewhere when it suddenly stopped (lost all the water it had and the engine overheated). The water pump is broken, the high-pressure pump has been replaced multiple times and the alternator isn't working.

He left the car for more than 1 year stopped until I got it.

It came with a flat battery, as I couldn't open the car with the remote and had to use the key, so we got it out and recharged it.
When we started the car (by jumping it), the fans were going at full speed, and still, go at full speed when we try to start it.
We cannot start the car with the key, as it doesn't do anything.

So we started trying to troubleshoot the problem, so far we tried some things:

Fuel is 1/2.
At first, to see if the engine was damaged, we rotated the engine using the crankshaft, and it rotated, so the engine is good as I could move it and everything rotated fine.
We jumpstarted the car, and here it cranked as normal, but the engine doesn't start.
Started to get out things from the engine, and our main guess was that the high-pressure pump was damaged in some way, fuel goes in, but doesn't go out to the injectors. We can see bubbles and movement going into the pump, but nothing comes out of the injectors.
Today I've been trying to find the pump relay and its fuse, to my surprise, something was done so those aren't used, I think 12v from the battery goes directly onto the pump because we saw some electrical tape in the electrical contacts of the fuel pump.

Here are some questions I have, is it possible that 12v goes directly into the high-pressure pump? Can the fuel pump be the problem on why the engine doesn't start and the ignition from the key doesn't work?

So far I got the suspicion that the high pressure pump is bad, but I'm not entirely sure as it can be anything.

Thank you.
 
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Cuboy

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Will try that, thank you.
 
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Cuboy

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There is compression on the engine.
 
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Cuboy

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Thanks for ruling that out.
What did you remove for the test, glow plugs or the injectors..?
None of them, I didn't remove anything.

Some mechanics have came to see it, and none of them got it working.
 
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Cuboy

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The car doesn't even crank, i called a mechanic, he told me that there was something up with the ignition port but there wasn't any problem on it.

My suspiction now is the ecu/inmobiliser or the key, but the key opens and closes the doors and opens the trunk, so it's the key?
 
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Cuboy

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Sooo when you put the key in the ignition switch and turn it to position 2, do the lights in the dash come on..?
Everything comes on, and the dash lights come on and stay on, every light is on (motor fail, heaters ...).
Also i get a code in the dashboard, -99999 if it has some relevancy (but i guess its consequence of every light being on)
 

mattkh

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Everything comes on, and the dash lights come on and stay on, every light is on (motor fail, heaters ...).
Also i get a code in the dashboard, -99999 if it has some relevancy (but i guess its consequence of every light being on)
Thank you.
This means there is a CAN bus issue. The ECU cannot talk to the different sensors,
Has the car been standing out in the rain or a garage..?
 
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Cuboy

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Thank you.
This means there is a CAN bus issue. The ECU cannot talk to the different sensors,
Has the car been standing out in the rain or a garage..?
Rain but i have to ask
 
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mattkh

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Rain but i have to ask
Look for water ingress in the car. Some CAN connector boxes are under the carpets and open to condensation corrosion.
I do not have any wiring diagrams.
 
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Cuboy

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Look for water ingress in the car. Some CAN connector boxes are under the carpets and open to condensation corrosion.
I do not have any wiring diagrams.
Do you know how does it look like? Where is it located exactly?

Thank you.
 
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Cuboy

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Hello again, i've been researching for a while now since you posted your reply, is there a can bus on my car?

Since it uses a 38 pin round obd, i've researched to find the pin out, but there is no obd_h and obd_l, as per the more modern versions (after 2000) there is.

1629680684935.png
Tomorrow i'll check out if its the same connector, but it seems to be that one.
 

mattkh

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Well done for your research.
I do not have access to any electrical diagrams for cars.
I am not 100% sure about the ECU communication on your car.
There are some threads here for debugging using the 38 pin connector.
Have you noticed any water ingress anywhere in the car..?
 
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Cuboy

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Well done for your research.
I do not have access to any electrical diagrams for cars.
I am not 100% sure about the ECU communication on your car.
There are some threads here for debugging using the 38 pin connector.
Have you noticed any water ingress anywhere in the car..?
No, I haven't noticed that anywhere.
Today i'll check if there is 12v getting to the solenoid when I ignite using the fob, that might be the failure
 
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Cuboy

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Found this diagram online:

1629712866625.png

W202 Electric Scheme of Starting and Charging the Battery
 


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