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Re: erasing check engine light
Posted by 20years (more from 20years) on Mon, 25 Jun 2007 20:21:15
In Reply to: Re: erasing check engine light, Jason, Mon, 25 Jun 2007 09:22:42
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Pass your car for what? Are you trying to pass emmissions? If so you have to drive it some city and some highway until all monitored systems read ready on a generic OBD2 scanner. The catalyst test is the last test the ECM runs for OBD2 readiness. I had to put about 20 miles of relaxed highway driving and 10 miles of city on the last one I did before the cat showed ready on the scanner. Ready = test passed. The reason they call it On Board Diagnostics is because your car runs it's own tests onboard and then records a pass or fail in it's own memory. Any emmissions related fault (failed test) will by federal mandate trigger the CEL. If you clear the fault code, all your passing grades are erased and the readiness tests start from zero. Each test has criteria based on software.
The evaporative emmissions test will only run with 1/4 to 3/4 of a tank of gas for instance. Each onboard test has to see certain conditions of load and temperature etc. before the test will run. That is why various driving conditions are required to pass each test in order. Test #4 will not run until 1,2 and 3 are showing ready (passed).
I've gone on too long considering that I am only guessing that you failed emmisions.
Posts in this Thread:
- erasing check engine light, Jason, Thu, 21 Jun 2007 10:29:57
- Re: erasing check engine light, Jason, Mon, 25 Jun 2007 09:22:42
- Re: erasing check engine light, 20years, Thu, 21 Jun 2007 21:54:21
- Re: erasing check engine light, NCSaab , Thu, 21 Jun 2007 14:49:23
- Re: erasing check engine light, jimg, Thu, 21 Jun 2007 12:00:03
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