Engine: D5244: Quick MAF question

[Joe Harding]

VIDA allows you to calibrate a new MAF sensor. I haven't run it for two reasons - 1) my sensor is still the original and 2) I don't want to foul up a working system.

However I have been having occasional MAF output too high notifications and using the diagnostics have seen this to be the case, in spite of repeated cleaning.

If I run the cal routine, will it cause any issues?

Thanks in advance

[Georgeandkira]

What year?
I ask because the upstream oxygen sensor has a lifespan (at least in the petrol engines) which can end after 150K miles and however many years. I'd suspect 10 or 12. The oxygen remaining in the exhaust flow is the only thing the O2 sensors can check.

I'm no pro but upstream sensors are all I've ever had to change when the associated code comes up. However, all I ever had were basic code readers.

While dearer than some, Volvo (Denso) oxygen sensors are still fairly affordable where good (meaning Volvo) MAF sensors are pricy.

Do you have specific diagnostics with your VIDA which point to the MAF or did you infer your conclusion?

[Joe Harding]

V70 2007 diesel, end of the series 2 models (and what a shame too)

The real-time figures for the MAF showed stroke volume against real volume and the real measurement (!) was too high by about 25%. VIDA reported it was reading too high.

[Joe Harding]

Bump! Anyone know about calibrating a MAF?

[Georgeandkira]

I've no experience calibrating a MAF.

Can you calibrate the MAF by the "about 25%" (assuming you can discern which way 'high' or 'low' go) then see? I assume with your VIDA you can restore to original then try 25% the other way.

I do know codes not used are as important as those used when diagnosing.

Since MAFs last so long and because forward (upstream) O2 sensors always go out first, you wouldn't be firing the parts cannon at it. It'd be more like sharpshooting.

15 years and 150K are reasonable lifetimes for an O2 sensor.

[Clan]

Originally Posted by Joe Harding

VIDA allows you to calibrate a new MAF sensor. I haven't run it for two reasons - 1) my sensor is still the original and 2) I don't want to foul up a working system.

However I have been having occasional MAF output too high notifications and using the diagnostics have seen this to be the case, in spite of repeated cleaning.

If I run the cal routine, will it cause any issues?

Thanks in advance

In all my life working on volvos I have never known of Calibrating any air mass meter , That is done in the factory with a known air flow and comparing it with the output voltage . I cant see what you would calibrate it with anyway? It is not in VIDA instructions for fitting a new air mass meter and I have just spent 20 minutes trying to find it under diagnosis.
cleaning an air mass meter could be an £350 expensive mistake I have seen 2 destroyed by people doing this . Ask yourself how could it possibly get dirty? It is fed by ultra clean filtered air , and the inside of the air filter housing down stream of the air filter is always as clean as new. hot wire or the later ceramic ones burn off any deposits when you turn the ignition off.