Vehicle has code for general evap failure. Smoke test system from service port and from fuel cap, no leaks present according to flow meter on smoke machine. While smoke testing under pressure the FTP pid reads 6.34 mmHg converted to 3.39 "H2O and FTPV is .8v. When command purge at 50% and vent valve closed, pids read: FTP -5.98mmHg converted to -3.19 "H2O and FTPV is 2.2v. When sealing system and commanding purge to 50% i am reading about 7"Hg at the service port, after vacuum guage smooths out. The FTP pid is kinda eratic sometimes and I think I should see higher pressure and vacuum values in my limited EVAP expierience (learning new things everyday on the EVAP info). I am kinda leaning on a faulty FTP sensor but am wondering if sensor can be removed and apply vacuum directly to sensor and monitor pid to verify sensor replacement. After doing alot of reading and trying to understand EVAP data from alldata i understand the PCM uses the FTP value to determin if a fault is present in EVAP system. Looking for info from some more experienced EVAP techs.
Thanks a bunch
Darren
Thanks a bunch
Darren
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