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2004 Mazda B2300 M/T 5spd EGR not ready CA smog test, unable to reset drive cycle after several attempts
EGR VVL sensors not ready but no check engine lights or codes. Tried resetting the drive cycle several times but still haven't cleared. What can I check/fix/replace? Vehicle has passed all previous smog tests. Can the drive cycle be run on a dyno?
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There are several monitors in your computer and whenever the computer is reset to turn off the check engine light, the monitors have to run a full cycle to show that they are good. Even though your check engine light might not be lit, the state will not pass emissions unless all drive cycles have been cleared. If you reset the check engine light, you might as well fix the error that caused it to light or you will not be able to pass the emission test. If there isn't an issue, you should be able to just drive for a couple of days for the cycles to complete.
Each vehicle has a different drive cycle, depending on the vehicle, normal driving usually resets the monitor and I know it includes, driving in town and highway, idling, A/C on, backing up ect. If the monitor doesn't reset after several days of driving get it hooked to a scanner and see what sensor is causing the failure.
Did you disconnect the battery recently? Or have the car worked on to correct a check engine light problem? And they reset the codes?
When this happens (loss of all power or code reset), the computer will run all its tests on all systems, and set a 'ready' condition when the tests are passed. Some tests require multiple 'drive cycles' or specific conditions (less than full tank of gas but more than 1/4 tank) to complete the test. Until all (or a specific number - some non-critical tests may be exempted) tests are 'ready', the car will not be passed. The assumption being that until a test is successfully completed, the computer may discover a problem with a system, one that would fail the smog test.
If you're confident that all problems have been fixed, you need to run through enough drive cycles so the computer can complete all required tests. Most ODBII code readers can also read the readiness of the systems. And most parts stores will read your codes for you (and system status) or let you borrow a reader.
Not sure how old the vehicle is, or model, or engine, so I can only give general suggestions. You may need new catyitic converters, or O2 sensors. They sometimes can't be corrected, just replaced.
No this is not right. If you remove the battery everything resets anyways. If they are talking about relearn procedure, it should only require 50 miles. But if the light is on than either they did something wrong, created another problem, or there was already another one existing. Have the code read and let me know what it is. I'm in Ca too and used to prep european cars for smog, so I do know what I'm looking for. How did the rest do? What were the readings(if possible)?
Drive the car for 2 miles non-stop and take it to smog inspection WITH OUT TURNING OFF THE CAR!! the key is that the car goes threw the test while the engine is running ...
if the car is turned off ... u will have to repeat procedure ...
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