Member Since: 23 May 2011
Location: Surrey
Posts: 98
MAF Sensor
Q: Should the D3 run differently when the MAF sensor is disconnected?
Some of you may have seen my Black Smoke thread in which I say that I have changed/eliminated most things, IC hose etc. Well, today I have disconnected the MAF sensor and there is absolutely no difference in how she runs. Same smoke, same performance, same MPG and same idling. Have I found the problem? Or, should I expect it to be the same which begs the question why is it there?
Please help, am beginning to fear that I've joined CFT!
Thank you.Java Black Metropolis MY06
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30th Aug 2011 5:07 pm
mathewdowns
Member Since: 31 May 2013
Location: Bournemouth
Posts: 207
Hi
Did you find your reason for black smoke? Done similar and heckled all pipes etc. The MAF sensor is reporting 0g/s.....
Did you end up trying the MAF?
Cheers
Mat
30th Mar 2016 8:50 pm
Rawhide
Member Since: 03 Jun 2014
Location: Gloucester
Posts: 42
As per the post a few down this page do you have a fuse powering the MAF sensor in slot 17?
31st Mar 2016 7:13 pm
mathewdowns
Member Since: 31 May 2013
Location: Bournemouth
Posts: 207
Rawhide
Checked that one and found have the 12v and 5v with fuse in 17.
Thank you for suggestion.... Anything taken!
The output from the MAF is a variable width pulse, the wider the pulse the more air the sensor has "seen". If you have access to a simple scope you can see if it is outputting anything. As you rev the engine the pulse width will change.Volvo XC60 - does all that the D4 should have done
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31st Mar 2016 7:46 pm
Robbie
Member Since: 05 Feb 2006
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Posts: 17932
A multimeter with a frequency counter can also track the changes in the PWM signal:
Click image to enlarge
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