MAF snap-rev test
Post Fiend
Joined: Dec 2001
Posts: 10,562
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From: South Jersey
MAF snap-rev test
That's not a fun way to start your day. I guess one of the modules did like the power it was getting and was letting you know using the door locks. 
Hope you got a new battery and everything is good now.
What book did you find thatinformation in?
Hope you got a new battery and everything is good now.What book did you find thatinformation in?
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Posting Guru
Joined: Feb 2002
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From: Warren, MI
MAF snap-rev test
Ken:
It was in the Powertrain Control/Emissions Diagnosis manual, Section One, Description and Operation, PCM Inputs, MAF, Page 66(1-66).
That's two batteries in this 97 and one in a 86 I had that went the same way! I have my Father's old 90 Buick and my 78 Vette both with 13,000 mi. on them. The batteries just go the normal old way
It was in the Powertrain Control/Emissions Diagnosis manual, Section One, Description and Operation, PCM Inputs, MAF, Page 66(1-66).
That's two batteries in this 97 and one in a 86 I had that went the same way! I have my Father's old 90 Buick and my 78 Vette both with 13,000 mi. on them. The batteries just go the normal old way
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
MAF snap-rev test
I found it, mines on CD so it doesn't have page numbers. I did notice that some MAFs have the IAT in the MAF, it's call IBT.
The only thing I can figure is it's due to all the electronics that the older vehilces don't have.
The only thing I can figure is it's due to all the electronics that the older vehilces don't have.
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Posting Guru
Joined: Feb 2002
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From: Warren, MI
MAF snap-rev test
Ken:
What's IBT stand for? I just poked around in the Perception looking for IBT under GM and Ford but couldn't find it but could have easily missed it depending on what's its used in.
What's IBT stand for? I just poked around in the Perception looking for IBT under GM and Ford but couldn't find it but could have easily missed it depending on what's its used in.
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
MAF snap-rev test
From the 2000 manual, I believe the 2002 3.0 Ranger has this setup but I would have to look to be sure.
Some MAF sensors have integrated bypass technology (IBT) with an integrated intake air temperature (IAT) sensor. The present applications with IBT are: Focus, Escort (4V), 2.0L Contour/Mystique, Cougar, Taurus/Sable, Windstar, Explorer/Mountaineer and E-Series.
Some MAF sensors have integrated bypass technology (IBT) with an integrated intake air temperature (IAT) sensor. The present applications with IBT are: Focus, Escort (4V), 2.0L Contour/Mystique, Cougar, Taurus/Sable, Windstar, Explorer/Mountaineer and E-Series.
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Posting Guru
Joined: Feb 2002
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From: Warren, MI
MAF snap-rev test
Ken:
Connected the Perception to the Escort to compare signals. Got the same looking waveforms. I get a squarewave from the IAC but the database shows a sawtooth which I've also found on the web elsewhere. I wonder where they get that sawtooth from? An old version of the IAC???
Connected the Perception to the Escort to compare signals. Got the same looking waveforms. I get a squarewave from the IAC but the database shows a sawtooth which I've also found on the web elsewhere. I wonder where they get that sawtooth from? An old version of the IAC???
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
MAF snap-rev test
Sorry, I can't help one that one. Might be a good question for a OBD-II board.
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Posting Guru
Joined: Feb 2002
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From: Warren, MI
MAF snap-rev test
Ken:
That forum gets a bit slow at times and is right now. There are only a few peolple in that forum that might be able to answer that question. Come to think of it that's really a tough question.
I read a article on the net the California CARB laws stated that shops must have a DSO, Digital Storage O'scope but they've seen them in shops still in the box, never used! They never took the time to learn how to use them. They said that it's easier and faster to diagnose problems with one instead of just a DMM.
That forum gets a bit slow at times and is right now. There are only a few peolple in that forum that might be able to answer that question. Come to think of it that's really a tough question.
I read a article on the net the California CARB laws stated that shops must have a DSO, Digital Storage O'scope but they've seen them in shops still in the box, never used! They never took the time to learn how to use them. They said that it's easier and faster to diagnose problems with one instead of just a DMM.
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Posting Guru
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From: Warren, MI
MAF snap-rev test
[updated:LAST EDITED ON 31-Aug-02 AT 11:10 PM (EST)]Ken:
I mean that a question is posted and goes unanswered for days and some never get answered. I posted the same question about the MAF snap-rev test and only got one hit but still nobody has ever performed that test.
I'm not sure if all DSOs have a DMM built into it. Some are really cheap like the price of a good DMM. I think a good DMM is better than the built in DMM in my DSO. You need a good DMM to perform that MAF snap-rev test. I did try that test using the DSO and got the same results as with the Fluke 189. The OTC DAT isn't fast enough to catch the peak voltage.
I'll come back and some interesting links to this post.
Look at these:
http://www.autotruck.net/ms/archives/2001/0301/0301lab.asp
http://www.interro.com/techtips.htm
http://xena.ipns.com/~fourty/signals.html
http://xena.ipns.com/~fourty/
I mean that a question is posted and goes unanswered for days and some never get answered. I posted the same question about the MAF snap-rev test and only got one hit but still nobody has ever performed that test.
I'm not sure if all DSOs have a DMM built into it. Some are really cheap like the price of a good DMM. I think a good DMM is better than the built in DMM in my DSO. You need a good DMM to perform that MAF snap-rev test. I did try that test using the DSO and got the same results as with the Fluke 189. The OTC DAT isn't fast enough to catch the peak voltage.
I'll come back and some interesting links to this post.
Look at these:
http://www.autotruck.net/ms/archives/2001/0301/0301lab.asp
http://www.interro.com/techtips.htm
http://xena.ipns.com/~fourty/signals.html
http://xena.ipns.com/~fourty/
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Posting Guru
Joined: Feb 2002
Posts: 1,534
Likes: 2
From: Warren, MI
MAF snap-rev test
Ken:
That OnTool page some pretty good stuff on it! Buyer's guide for DSO, DMM, etc.
I ordered a book of WaveForms for sensors, etc. and covers general LabScope usage too!
That OnTool page some pretty good stuff on it! Buyer's guide for DSO, DMM, etc.
I ordered a book of WaveForms for sensors, etc. and covers general LabScope usage too!
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