Instant fuel consumption

M D E · Post by **M D E** » Tue Feb 17, 2009 1:56 pm

Hi, After Reading this forum I have finally fixed my instant fuel consumption Reading which was sticking at 60.5, now it reads correctly but only upto 55mph once I go above this speed it returns to 60.5mpg ! Any ideas why ?

Iroll480 · Post by **Iroll480** » Tue Feb 17, 2009 3:35 pm

On page 63 you can find the wiring diagram for the instant fuel. It''s in dutch, but the schemes are international used. I suspect a bad MFU which does the mathematics from the info delivered by ecu (opening time of injectors) and speedometer for the info centre. The MFU is the small triangular circuit board which is located at the backside of the instrument cluster behind the white plastic cap. Check all the soldering points with a magnifying glass on the MFU. Could be something simple as that which makes resistance too high. Or change the MFU but be sure to get the right type for your car. They're not interchangeable between engine types/MY.
And check all the connectors from the speedometer to the board and the wiring loom from the multi switch to the MFU, the broad grey one.

glasgowjim · Post by **glasgowjim** » Tue Feb 17, 2009 4:58 pm

MFU mother f*** unit

Iroll480 · Post by **Iroll480** » Tue Feb 17, 2009 5:25 pm

You took the words right out of my mouth!