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Discussion Starter #1
Had my Master at a reliable workshop because it run rough and had no power.
They replaced a few sensors and checked /tested pump and fuel pressure but still no power.
They also replaced the AFM and still the problem persisted.Now they decided to disconnect the AFM and miraculously ,van runs fine...perfect in fact!If they connect the NEW AFM ,van has no power!I am now running the van with the AFM disconnected!
My question is ,does the AFM have to be coded by a Renault dealer for the Ecu to know that a new AFM is there?
I ask this because I also have a BMW 330 D and when the AFM went,it had to be coded by dealer,before ECU accepted it
Thanks for your help....
 

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Discussion Starter #2
User with similar problem?????

This user here http://www.renaultforums.co.uk/showthread.php?t=41556&highlight=air+flow+meter

seemmed to have a similar problem!Disconnects Air Flow Meter and the car has power again!
However,he then traced fault to a loose turbo pipe??How did the car get power again with loose turbo pipe and by disconnecting AFM?I assume the pipe could only be the one where the AFM is fitted!
In my case all is tight and secure........
 

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Are you referring to the Air Flow Meter also known as the MAF. If so when you disconnect it the ECU goes into default mode regardless:)
 

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Are you referring to the Air Flow Meter also known as the MAF. If so when you disconnect it the ECU goes into default mode regardless:)
Thank you fro the reply.

Yes.AFM/MAF .Same thing!
I understand that when Maf is disconnected Ecu goes into default mode!What I dont understand is why is it that when I connect NEW MAF ,car looses power!Its as if ECU doesnt recognize it!As happens with Bmw,MAF needs to be coded by dealer!
Usually on some vehicles ,when you suspect you have a bad Maf.you simply disconnect it and if car has power,you know its a bad Maf.So,you buy a new one and car is fine again.
In my case this didnt happen,hence my asking if it needs to be coded!

THANKS
 

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To be honest I don't know if the MAF needs to be coded when renewed. Having said that like yourself I have heard of many MAF units being replaced without the need for programing.
On the other hand the MAF may be perfectly OK and the fault is elsewhere but by making the ECU go into default mode it by-passes the problem.

It may be prudent to seek advice form a diesel specialist rather than go to Renault:)
 
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