RPB

Hey Guys,

My ‘02 w/ 69k miles refused to start in my driveway last week after driving a good amount in the morning. It cranked after a couple hours; I had no issues starting for the next couple of days and then it completely refused to start. Code P0335 was stored when I checked w/ my OBD scanner. I ordered a Bosch replacement from Amazon and had it towed to my mechanic. He charged me an hr labor, it kind of looked like a pain to replace without the proper tools.

I stumbled across a post from one guy who said he keeps a spare in his car because failure is so common on 203s. I’ve owned quite a few MBs in the past, this is my first 203 and the only time I had to replace a CPS. I’m interested in finding out the general longevity of this part? I can only assume a genuine Bosch part lasts longer than some of the inferior mfgs out there.

Cheers,

-Rob

Rudeney

CPS failure is an odd thing. I;ve personally never had one fail, but I know many who have. I have a theory that it's not the CPS itself, but slight variations in the distance between it and the flywheel pulse ring.

RPB

Interesting you should say that. The first time it refused to crank I parked in my driveway on a forward facing incline. When it cranked again after a few hrs I reversed out of my driveway and moved it to a forward facing position like I usually do. It cranked and drove fine for days and the CEL cleared by itself. I parked in the exact position after a couple days and sure enough it completely refused to start for days.

The tow driver dropped it on a flat surface at the shop; I attempted to start w/ no success. I requested the tech clean the female plug before installing the new part. I can only assume everything has to be spot-on for a CPS to function properly. Knock on wood it has been running fine after the replacement.

Cheers,

-Rob

Zee1000

I'm having a major issue with my w203. It cranks like forever and refuses to start. Sometimes especially when it's been parked for quite a while and cool, it starts normally. Its so bad right now, I cant even use the car.
I've replaced the fuel pump, the fuel filter and cps. Still no solution.

Rudeney

That really sounds like CPS failure. Where did you buy the CPS?

Zee1000

In a nearby market. I could not get a brand new cps as those are really scarce over here. But the technician working on the car said something about the earth coming from the ECU isn't reaching the cps. Probably fault might be from the ECU. Got any help on that? Thank you.

Rudeney

That should be easy to trace in the wiring. Does the ECU have ground? Maybe you have a bad ground wire. There are several under the hood.

Zee1000

So should I trace the wires for any breaks or replace the ECU?

Rudeney

Trace wires, definitely! I doubt the ECU has failed since it starts sometimes.

Zee1000

Thanks man. I really appreciate. I b sure to do d trace tomorrow. I will get back to you with updates. Thanks again.

RPB

Did you buy a Bosch part? I only buy Bosch or Meyle for my cars if the OEM part is not readily available. I read the URO parts CPS and pretty much all other inferior brands out there run at a different voltage or something like that which is why the car still will still have issues after installing. This popped up quite a bit when I was researching.

How old is your battery? The simple things like this sometimes get overlooked.

Zee1000

Hey man
I did d write trace and nothing was found
All wires were intact.
Had to buy a new ECU with ignition and key, and boom, my car roared back to life.
But now, my windows won't go down or come up.
They're stuck.
The switch on the driver's door don't work right now.
Please how do I correct that.
It was working perfectly fine prior to the ECU replacement.

RPB

You stated a CPS is “scarce” over there, but you managed to source a new ECU for your car and have it installed in less than two days.

Sounds like your window issue requires the reset procedure similar to when a new battery is installed. GL

Zee1000

Shocking?
Welcome to Inside life.
Please how do I go about this reset procedure?

Rudeney

I would start by checking fuses for the door controllers and windows. But given that you replaced the EIS (I assume with a used one) it could be defective and not sending the appropriate wake signals on the CAN bus. There is no coding (or lack thereof) that would cause the windows to not work.

Zee1000

Thanks Rudeney.you been of great help man
I went back and got it recoded or reprogrammed or whatever they did to it with them computers.
Now it's working perfectly.
Got my car back
Everything is ok now.
Thanks guys. I really appreciate yall
I hope I can be of help to others too on the platform.