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emissions and setting readyness

on Mon Oct 16, 2017 11:51 am
emissions... we are all factory equipped with emissions equipment and the majority of the time in a performance based application we remove emissions hardware. in this topic id like to discuss emissions testing, monitors and the difference between fail, incomplete, not equipped, and pass status. id also like to discuss the process of coding out missing hardware

monitors are tests that check the well being of the emissions testing system. example catalyst diagnostics. if you have a bad cat, high ethinol fuel or youve removed your cat you will set a code for p0420
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Re: emissions and setting readyness

on Mon Oct 16, 2017 11:54 am
catalyst efficiency below threshold. along with the p0420 yoll get a "FAILED" monitor status . incomplete status can be from a freshly cleared check engine light using a scanner or from hard reset or from something keeping the ecu from running the test. a failed downstream o2 sensor will keep the ecu from running catalyst diagnostics because part of the hardware that is used for emissions testing is faulty and is unable to complete the test. a code for failed o2 sensor would be present and monitor would show incomplete status. "system not equipped" means just that. some cars have monitors others are not equipped with, when scanned with a obd tool and checking monitor status and "not equipped" status is shown the ecu is configured to show not equipped because the car doesnt have the testing equipment for that emission test. "pass "status means the ecu ran tests on the emissions hardware and all is working as it should.a "passed' status will show and youll have no codes related to that emission system
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Re: emissions and setting readyness

on Mon Oct 16, 2017 11:54 am
-CDKAT: CDKAT is a bit switch to enable or disable catalyst diagnostics. when CDKAT is active the hex value will be 01. to disable 01 to 00 catilyist is now set as not equipped. Any codes related to catalyst diagnostics are now disabled and the monitor status is set as unsupported / pass with vcds. some of the later software versions have more then CDKAT, they also have CDKATSP, and CDKATSPF. those other sigle bit maps need to swapped to 00 also.
-MSLUB & MSLBAS : These are the secondary air flow table. The values in this table are calculated airflow for a given battery voltage and are displayed in kg/h. To disable (or rather fool the ecu into accepting no flow as normal) you must set these values to 0. It will also have the happy side effect of causing the readiness tests to actually run and pass.
-CDLDP: evap leak detection pump diagnostics. 00= off
CDTES : evap system diagnostics. 00=off
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Re: emissions and setting readyness

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