175 DCI P2101 - Throttle Actuator Control Motor Circuit Range/Performance

Had the "check injection" message appear the other day, with the above fault code being logged.

I've cleared it but when I restart the engine it comes back.

Any ideas?

 

EGR delete is part of my plan long term - and you're probably right about the throttle actuator - although I didn't think diesels had throttles. I've had a look in the workshop manual and I can't see a throttle listed for the M9R, but I can see an "air inlet flap" which looks remarkably similar.

My plan was to buy a Clip long term anyway so I was going to buy one now to see if I could get more diag information.

 

I've scanned it using a clip and of course you were correct - "DF645 INLET AIR FLAP POSITION CONTROL".

I'll have a look at the cleaning process. Hopefully I can just take one end off and squirt some brake cleaner in as access to that area is quite restricted.

 

I took the flap out today - I was a bit scared reading the workshop manual about removing the bumper etc but none of that was necessary.



There was a little oil in there but nothing that bad, I cleaned it up regardless.







I also cleaned all the plugs out with contact cleaner. Flap seemed to move freely, although it was hard to move due to the spring.

Further down the inlet I could see some crud but as this is where the EGR is that is to be expected - but nothing significant.



Here's hoping it goes away (I may have to reset the light again to find out though).

 

Ok - I thought the flap was in the throttle I removed. Are you saying it's actually an EGR issue?

 

Could you give me a little more detail of how you did this please? Did you remove the pipe and leave the EGR in situ or something else?

To get to where I was wasn't too hard, just fiddly. 1/4" ratchet and some short extensions are all you need.

 

Someone on the Facebook group has removed it completely.

 

Took the EGR out today - very very fiddly but I managed to do it all from above without removing the bumper.

EGR and the surrounding pipework was caked with carbon deposits after all so that's probably what's been causing the issue.

Cleaned it up and will see how I get on tomorrow.



Cut three fingers three separate times on the tabs on the EGR exhaust gaskets. Ouch. Engine is covered in my blood now.

 

Reset the light with Clip and it's yet to come back. I think it's fixed

 

I've cleaned the EGR again, reset it on Clip, but the fault comes back after a while - I think this suggests that it's a fault with the throttle flap thing?

 

Using Clip, I was able to test the actuator on the car.




This allowed me to see that the actuator was working





I was a bit stumped at this point so I had a look inside



Basic motor setup with a contract / track setup to record the position of the flap.

You can see the contacts highlighted in red



I noticed that one actuator had a lot more carbon on the ends of the contacts. I cleaned all the connections with contact cleaner, and bent the contacts up slightly to make better contact with the tracks. Seems to have fixed it for the last couple of months!

 

Hope it works out for you - interesting to know I’m not the only one who had this problem