MAF... MAP... Open/Closed loop cycles
Thread Starter
Advanced
Joined: Oct 2012
Posts: 52
Likes: 5
MAF... MAP... Open/Closed loop cycles
Phew... been doing a lot of reading and searching but havent been able to find a clear description of this! I need a lot of education!!!
Im a recent older mustang convert. The old MAF cars would not run if it went out. I have a MAP based standalone on that car now. As these cars ran on one or the other it was kind of easier to pinpoint the problems with it!!
Now after some reading... these C5 vettes have both MAF and MAP sensors...
So to the problem...
My new to me 2k vette is throwing a consistent P0102 code. Ive only started to work on the car this week have not gotten to the point of cleaning all of the grounds (waiting for jacking pucks). The car has stalled on me once, but otherwise drives pretty well. It doesnt seem to have any idle or driveability issues, except for the one time when it stalled. When that happened it seemed to hiccup then shut off. Started up right away, shut off again. Did this a couple of times then but has been running again ever since (few days)
I have cleaned the MAF element using a MAF cleaner... checked and changed the PCV.
Checked the fuse.
The car seems to idle and rev perfectly fine with the mass air disconnected!!
I will be checking for power and ground continuity at the MAF later on today.
Im trying to understand how the MAF and MAP work together in this car and when open and closed loop cycles come into play. Any insight into this would be great!
Is it correct to assume that with a P0102 code that the car is running in some kind of default mode and is operating solely off of the MAP sensor?
I havent had a "reduced power" indicator come on yet... but then again, I havent really laid into it very hard.
Im a recent older mustang convert. The old MAF cars would not run if it went out. I have a MAP based standalone on that car now. As these cars ran on one or the other it was kind of easier to pinpoint the problems with it!!
Now after some reading... these C5 vettes have both MAF and MAP sensors...
So to the problem...
My new to me 2k vette is throwing a consistent P0102 code. Ive only started to work on the car this week have not gotten to the point of cleaning all of the grounds (waiting for jacking pucks). The car has stalled on me once, but otherwise drives pretty well. It doesnt seem to have any idle or driveability issues, except for the one time when it stalled. When that happened it seemed to hiccup then shut off. Started up right away, shut off again. Did this a couple of times then but has been running again ever since (few days)
I have cleaned the MAF element using a MAF cleaner... checked and changed the PCV.
Checked the fuse.
The car seems to idle and rev perfectly fine with the mass air disconnected!!
I will be checking for power and ground continuity at the MAF later on today.
Im trying to understand how the MAF and MAP work together in this car and when open and closed loop cycles come into play. Any insight into this would be great!
Is it correct to assume that with a P0102 code that the car is running in some kind of default mode and is operating solely off of the MAP sensor?
I havent had a "reduced power" indicator come on yet... but then again, I havent really laid into it very hard.
Tech Contributor
Joined: Jan 2007
Posts: 19,246
Likes: 1,095
From: Dyer, IN
Phew... been doing a lot of reading and searching but havent been able to find a clear description of this! I need a lot of education!!!
Im a recent older mustang convert. The old MAF cars would not run if it went out. I have a MAP based standalone on that car now. As these cars ran on one or the other it was kind of easier to pinpoint the problems with it!!
Now after some reading... these C5 vettes have both MAF and MAP sensors...
So to the problem...
My new to me 2k vette is throwing a consistent P0102 code. Ive only started to work on the car this week have not gotten to the point of cleaning all of the grounds (waiting for jacking pucks). The car has stalled on me once, but otherwise drives pretty well. It doesnt seem to have any idle or driveability issues, except for the one time when it stalled. When that happened it seemed to hiccup then shut off. Started up right away, shut off again. Did this a couple of times then but has been running again ever since (few days)
I have cleaned the MAF element using a MAF cleaner... checked and changed the PCV.
Checked the fuse.
The car seems to idle and rev perfectly fine with the mass air disconnected!!
I will be checking for power and ground continuity at the MAF later on today.
Im trying to understand how the MAF and MAP work together in this car and when open and closed loop cycles come into play. Any insight into this would be great!
Is it correct to assume that with a P0102 code that the car is running in some kind of default mode and is operating solely off of the MAP sensor?
I havent had a "reduced power" indicator come on yet... but then again, I havent really laid into it very hard.
Im a recent older mustang convert. The old MAF cars would not run if it went out. I have a MAP based standalone on that car now. As these cars ran on one or the other it was kind of easier to pinpoint the problems with it!!
Now after some reading... these C5 vettes have both MAF and MAP sensors...
So to the problem...
My new to me 2k vette is throwing a consistent P0102 code. Ive only started to work on the car this week have not gotten to the point of cleaning all of the grounds (waiting for jacking pucks). The car has stalled on me once, but otherwise drives pretty well. It doesnt seem to have any idle or driveability issues, except for the one time when it stalled. When that happened it seemed to hiccup then shut off. Started up right away, shut off again. Did this a couple of times then but has been running again ever since (few days)
I have cleaned the MAF element using a MAF cleaner... checked and changed the PCV.
Checked the fuse.
The car seems to idle and rev perfectly fine with the mass air disconnected!!
I will be checking for power and ground continuity at the MAF later on today.
Im trying to understand how the MAF and MAP work together in this car and when open and closed loop cycles come into play. Any insight into this would be great!
Is it correct to assume that with a P0102 code that the car is running in some kind of default mode and is operating solely off of the MAP sensor?
I havent had a "reduced power" indicator come on yet... but then again, I havent really laid into it very hard.
Race Director
Joined: Mar 2008
Posts: 12,413
Likes: 501
From: Rio Rancho NM
Your maf took a crap mine did the same thing a few months ago. tried troubleshooting it and borrowed a new maf and sure as heck my maf took a dump. Ordered one of ebay for 35 shipped and good as new no more codes. Same thing car ran great with maf disconnected in open loop/safe mode.
Tech Contributor
Joined: Jan 2007
Posts: 19,246
Likes: 1,095
From: Dyer, IN
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Thread Starter
Advanced
Joined: Oct 2012
Posts: 52
Likes: 5
Yesterday I picked up a replacement MAF, and before installing it I checked power at the fuse and power/ground at the MAF plug.
Swapped out the MAF... everything works now as it should! 15 minute job!
lucky131969 provided me with some useful information about how this PCM works with both MAF and MAP!
Thanks!! Learning as we go!
Swapped out the MAF... everything works now as it should! 15 minute job!
lucky131969 provided me with some useful information about how this PCM works with both MAF and MAP!
Thanks!! Learning as we go!