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The question is for a friend who had the code i looked at the data determined it needed a o2 sensor heater was out no voltage change etc and he replaced it drove fine for a week then back on. Tonight he came by and i recorded the live data and noticed code connect says it could be a brake booster issue which i noticed the fuel #’s lt and st go crazy when braking. So my question is could that really be the issue just a vacuum issue in the pb booster? i’ll post the freeze frame data and if any one would like to see the full data i can post it as well. Thanks for any comments and i hope this is the right area to post this in been awhile since i’ve been stumped on a issue.
View Freeze DataP0171 (MOD $10)
TROUB CODE P0171
ENG SPEED(RPM) 3578
CALC LOAD(%) 58.4
COOLANT(°F) 176
IAT(°F) 75
ST FTRM1(%) 7.8
LT FTRM1(%) 43.0
VEH SPEED(MPH) 60
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
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The p0171 means your running lean not that the o2 has a problem.
see if this helps.http://www.justanswer.com/toyota/6xczc-2002-toyota-camry-check-code-p0171-can-tell.html
Could very well be a vacuum leak. If the booster is leaking it can cause this. I would suggest disconnecting the vacuum line of the booster and plugging that line and see if the LTFT drops.
Karl
I know that the Sensor it self in voltage and testing it off the car told me it was bad lol. Thanks for the links i’ll give em a read apperciate the help.
Thats what i thought i had a issue on a older car i used to have and did that but was skeptical it still worked on the new obd2 cars.
[quote=”ToyotaKarl” post=97943]Could very well be a vacuum leak. If the booster is leaking it can cause this. I would suggest disconnecting the vacuum line of the booster and plugging that line and see if the LTFT drops.
Karl[/quote]
Thats what i thought i had a issue on a older car i used to have and did that but was skeptical it still worked on the new obd2 cars. Thanks for the advice and help i apperciate it.[quote=”college man” post=97927]The p0171 means your running lean not that the o2 has a problem.
see if this helps.http://www.justanswer.com/toyota/6xczc-2002-toyota-camry-check-code-p0171-can-tell.html
I know that the Sensor it self in voltage and testing it off the car told me it was bad lol. Thanks for the links i’ll give em a read apperciate the help.
Looks like a lean condition under moderate load. Try cleaning the mass airflow sensor and erase the fault code and recheck the fuel trims.
[quote=”wysetech” post=98042]Looks like a lean condition under moderate load. Try cleaning the mass airflow sensor and erase the fault code and recheck the fuel trims.[/quote] funny thing is when we replaced the bad o2 we cleaned the mass airflow sensor and throttle body ran fine for a week. After a week the code came back so now I’m starting to think it is bad.
Cleaned the maf again and the fuel numbers stayed the same about checked the pbb same thing but i noticed it only starts to take fuel away when it’s above idle under and throttle movement and the maf reading goes up and down even under steady 2500-3000 so i’m wondering is that a sign of a screwed maf?
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