Throttle Body Fault

[rondeauteller]

Good Afternoon to you all,

I currently own a w204, C Class C220, 2010, Blue Efficiency Sport saloon, 2.1, Manual, diesel.

I currently have a fault with the Throttle body which is short circuiting to ground, which I understand can be a common fault with the C class

My aim is to completely replace the throttle body. However, I need to know if its a straight forward job or are there any reprogramming/electronic issues that I need to be aware of. The last thing I want to do is to replace it and find out that the car will not start because it needs reprogramming.

I would be grateful for any advice

Thanks
K

 

[Gazwould]

What's the actual fault code / description ?

 

[alexanderfoti]

The EGR flap (throttle body) needs to be taught in with star, but the car will start and run without doing it.

 

[rondeauteller]

Hi there,

In relation to fault codes etc. I have managed to obtain and use the STAR diagnostic tool that the garages use. This has highlighted that the Throttle body has a fault & there are stored injector faults too. I believe the stored injector faults are a consequence of the throttle body fault. By replacing the throttle body hopefully this will cure the injector faults and the activation of my engine management light.
If there are no real electronic/reprogramming issues then my plan is to replace the Throttle Body.

Cheers

K

 

[mattkh]

I currently have a fault with the Throttle body which is short circuiting to ground.
Thanks

Short circuiting surely is a electrical connector wires issue.

 

[rondeauteller]

Hi there,

The Throttle body on my Merc is a fly by wire throttle system which uses electronics to make the link from the pedal to the throttle body. I suspect that the electronic components in the throttle body housing have malfunctioned. I will of course check any wiring when I replace the Throttle body.

 

[andrew65b]

Hi there,

The Throttle body on my Merc is a fly by wire throttle system which uses electronics to make the link from the pedal to the throttle body. I suspect that the electronic components in the throttle body housing have malfunctioned. I will of course check any wiring when I replace the Throttle body.

Hi there, how did this go for you. I have a similar prob and have replaced the throttle body, but the P2112 fault will not clear

 

[Gazwould]

Probably wiring going to the throttle body has broken down with the heat cycles .

 

[andrew65b]

Thanks, but is there way that I can test that? Otherwise, I'm wondering if there is a problem with relearning the new throttle body. I did have error P012315 (Position sensor 1 from the throttle valve has a short circuit to positive) so changed the throttle body, and now getting P211271. If I swap back to the old throttle body I go back to P012315 and back again to the new and I get P211271 again. Swapped several times and it is consistent. In addition, the old one does not open and close when the ignition is turned on but the new one does, so I assume that the old one was definately faulty. If there is a problem with wiring it seems unlikely that it would have failed at exactly the same time as the old throttle body? Hence I am thinking that it is either a faulty new throttle body (it is a new Bosch unit) or there is some sort of initiation/learing/config that is required.
For info, even though it is a 2012 model, it has only driven 25k miles, so hasnt been exposed to the same heat that you would expect from a similar age.

 

[alexanderfoti]

Is the replacement tb new?

Have you taught it in?

What is the definition of the error code?

 

[andrew65b]

Yes it is new, a Bosch part. No I haven't taught it in and was wondering if that is something that needs to be done and how? I have seen some posts about ignition on, accelerator down, 10 secs, ignition off, release accelerator, etc but doesnt seem to make a difference. If it does need to be "taught", is this the sort of error that you would expect until it is done?

 

[alexanderfoti]

I don't know what P2112 fault is, what is the code definition?

It needs to be taught in with star?

We do deal with some that have wiring faults.

 

[andrew65b]

I don't know what P2112 fault is, what is the code definition?

It needs to be taught in with star?

We do deal with some that have wiring faults.

Thanks, the definition is 'The throttle valve is jammed closed. The actuator is blocked'

 

[alexanderfoti]

Thanks, the definition is 'The throttle valve is jammed closed. The actuator is blocked'

Teach it in and see what happens. If it thinks it's open and it's actually closed, it's going to do stuff like this.

 

[Gazwould]

 

[andrew65b]

yes, that is the same as I am getting. I'm also using the iCarSoft MB 2. However it is clearly not jammed closed as I have seen it opening and closing when the ignition is still turned on.

 

[Gazwould]

That's just part of the garden path .

 

[andrew65b]

yes, that is the same as I am getting. I'm also using the iCarSoft MB 2. However it is clearly not jammed closed as I have seen it opening and closing when the ignition is still turned on.

Conclusion: I updated the software on my icarsoft MB2 which fortunately gave me the "teach in" function for the repalcement throttle valve. Unfortunately it didn't work, despite trying multiple times. iCarsoft promise to get back to you if you have a tech problem but it appears that that is a lie as I couldnt get any response out of them. I then took it to a local MB specialist who has Star and charges much less than a main dealer. He tried it and it also didnt work. He tried again (doing exactly the same as before as I watched him do it) and it did work, and cleared the error code (which didnt return) but didn't clear the fault light (wierd!). He then tried a third time, despite Star showing no faults, and it cleared the error light. Haven't driven it much since as converting the van into a camper but have prob done 60 miles in 2 trips, and no probs. £89 (incl VAT) for the throttle valve, £40 cash for Star, a very fiddly job getting access to do the physical replacement, and hours online researching.

 

[mattkh]

We live and learn.
Well done and thanks for the update.