All Things Mk5 > How to Guides / Troubleshooting

Help with Maf Sensor

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hadley8899:
 :thinking:

Hi Ive recently purchased a fairly high mileage MK5 GTI 2005 plate.

Ive done the following fixes so far
- Changed the cam follower (Was very bad)
- Changed the diverter valve (Was split)
- Changed the thermostat (Temp was down at about 60 at all times)

Ive now got an issue with the eml light. Its the code for the P0100, Its the Mass airflow sensor, So ive orded a new one and its arrived today, Plugged it in and I seem to have no reading from it.

It seems to read 655 at all times (Which probaly means its not detecting anything from it).

Any advice on what I can do now?, Wiring and connection looks ok. I havent looked any further than just the wires you can see without pulling apart the loom

Cheers
Ryan

Clarkj93:
Where did you get the MAF from? Genuine/after market? New/second hand?

hadley8899:
Went for a good old AutoDoc Special

https://www.autodoc.co.uk/autlog/14502499

pudding:
Hmmmmm  :grin:

What scan tool?  655 doesn't mean anything.  It should show a reading in grams/sec, which should be around 2.5g/s at hot idle.
 

hadley8899:
Yeah its 655g/s. Its the max possible reading the sensor can give from what I can gather, I assume its what the ECU defaults to if it cannot get a reading from it.

I suspect a broken wire or worse a f**ked ECU, I take it the MAF sensor goes directly to the ECU? Which isnt really to far away from where the sensor is sat

Not really sure what else it could be?

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