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MAF voltage at idle should be around 1.95-2.00 V usually.
Anything over 4.2 V at "incorrect" RPM will also in result limp mode.
This however is not necessarily faulty MAF but it could points to one, it could get misleading reading because extra resistance bad connection whatever or other issues. Are there any other codes for MAF?
Code 46 doesn't indicate MAF sensor as primary/foremost problem, possible causes are induction system, turbo, intercooler than MAF.
Cheers
Last edited by Rumcajs; 16th December 2013 at 10:24 PM.
The voltage is climbing with revs, and gets to nearly five volts (as near as I can tell watching the laptop and the road at the same time.) IT really is like flicking a switch - one minute fine with no indication of a problem, then straight down the big hole. Seems to usually be just over tow grand on the tach.....
There doesn't seems to be any leaks in the intercooler or its plumbing, I'm getting the same boost as I was before so I'm ruling out the turbo. What other 'induction system' components are there?
I think you've covered it all as far as induction components are concerned but. So if you have no bypass air/restriction (air cleaner for example)anywhere in the intake to turbo than it is possible that the MAF is a culprit. You could use logging function of the ECUtalk software so you could review the values of boost vs MAF voltages and RPM so you don't need to run a gauntlet on the road, not safe. What is the voltage when engine is not running just ign ON? If it is way above 1.0 V I'd be carefully checking the connector and the harness.
Cheers
Last edited by Rumcajs; 17th December 2013 at 09:53 PM.
Picked up a new MAF from Patrolapart in Lilydale today. Highly recommend these guys for their customer service, pricing and knowledge. Anyway, plugged it in, ECUTalk tells me voltages at idle are significantly lower (down to 2.1 volt). Start it up and drive down the road......the old truck is back! completely fixed. Thanks to all of you who offered advice, support and knowledge. Several of the symptoms were leading me a way from the MAF being the culprit, but there ya go....
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