Question about GMC Safari
4moniters not ready,evap,cat,egr,o2,im keeping tank full dont want evap read because of leak all i need is egr and o2. i've done 200km and every drive cycle i could find still won't read, why?
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Posted on Jan 02, 2017
Every time you reset the light or disconnect the battery it completely resets the system and it has to go through EVERY test again. The O2, EVAP, and Cat tests are generally the LAST THREE tests that are tested. You're not doing yourself any favors here.
Essentially what these readiness monitors are is the computer's notation that his has run the self diagnostics on each system and that the results feel into the expected results. If it is outside the expected results the computer will generally try to run the test multiple times before setting a DTC and turning on the Check Engine Light. It cannot set the status to "Ready" until it has a successful test within expected results; sometimes multiple successful tests. Sometimes, the tests need to run at different speeds - so the vehicle has to be driven not only at freeway speeds, but also city speeds for the tests to complete properly.
The O2 test MUST complete before the Catalyst test can run. The EVAP test generally requires that you have your fuel level at between 1/4 and 3/4 and that the vehicle sit undisturbed after being driven for a period of time for no less than 8 hours in order to run the EVAP test.
The same can be said for the O2 test sometimes because the computer needs to test the O2 sensors reaction to heating up and cooling down. Eventually they will all complete - unless there is an issue. I have seen where a component was in the process of going out and the computer was getting both GOOD and BAD results when running the tests. As a result it wouldn't set ready status because it wasn't getting the concurrent GOOD test results.
As a Texas Recognized Emissions Repair Facility - my shop sees this kind of stuff all the time.
Posted on Jun 01, 2011
SOURCE: 2001 olds aurora drive cycle.
Hello and welcome to FixYa!
It is suggested you take it for a few runs. 25kms. atleast. After that, you can remove the positive battery connector and let it sit for atleast 5mins. before reconnecting.
Hope this helps and thank you for using FixYa! Have a good one!
Posted on Jul 28, 2011
look for this pdf informations you will find what you are looking for
Posted on Oct 16, 2013
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