All Things Mk5 > How to Guides / Troubleshooting

Help with Maf Sensor

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Clarkj93:

--- Quote from: hadley8899 on March 10, 2022, 09:03:08 pm ---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?

--- End quote ---

My uneducated guess would be a wire but I have no faith in stuff AutoDoc sells to be honest. Does the old Maf give any reading at all or same result?

pudding:
Hmmmm, I'm not sure GTI MAFs can read as high as 655g/s.  That's enough for over 800hp  :grin:

It won't be the ECU.  More likely the sensor or a wiring problem.  If the engine has an aftermarket intake kit on it, the latter is a possibility.  The ECU does normally flag any wiring issues, such as "Short to B+", "Short to Ground", "Implausible signal", "Open or no signal" etc etc.

hadley8899:
Maybe my diagnostics is just crap... Its the TOPDON ArtiDiag500. Its either I dont know how to use it very well or it just doesnt give this kind of info.

Ive asked a local mechanic to come and have a look, He said hes dealt with this issue before and everytime hes done it its been a broken wire so ill see what he says.

Ill post what happens when I find out.

Cheers

hadley8899:
This is the data from a drive out I did while recording yesterday. Its just a constant 655 which would indicate its just doing nothing at all




Cheers
Ryan

pudding:
Yeah if the number doesn't move at all, definitely fooked.

I think there's only 3 wires on the MAF.  You could do a continuity check back to the ECU pins if you're bored?

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