Maf goes from 5v to 7v

mjb.thomassen · 2025-01-17T14:53:13+0000

My maf sensor from p38 4.6 goes from 5v with only contact on to 6.8 v when idling.
The previous time I had a broken maf the voltage did not go up at all.
Unless voltage goes up ,is this a faulty maf ?? .
The engine runs very bad and far too rich and regulary stops running also without maf.
Crank en camshaft sensors are good.
No leaking injektors(cheçked).rail pressure 2.4.

Mark Piercy · 2025-01-17T16:02:25+0000

Does the measurement change with engine speed?
Is it a three wire plug?
Earth,
5v and12v? Or
Earth,
5v and 5v?

mjb.thomassen · 2025-01-17T16:14:05+0000

3 plug earth 5v 12v

mjb.thomassen · 2025-01-17T16:14:59+0000

Voltage goes slowly up

Datatek · 2025-01-17T16:55:45+0000

mjb.thomassen said:
Voltage goes slowly up

As the hot wire resistance lowers with increased airflow, the output voltage should go up unless there are some electronics involved that dictate otherwise.

mjb.thomassen · 2025-01-17T17:35:12+0000

I thought the idling voltage was 1.5 v and from there it goes up.
My problem is the much higher voltage.
Doesn t That give a much higher output from the ecu

Maf goes from 5v to 7v

mjb.thomassen

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Mark Piercy

Well fumbled member....

mjb.thomassen

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mjb.thomassen

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Datatek

Well-Known Member

mjb.thomassen

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