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Location: Northern VA
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I wouldn't blame the ECU just yet. Lets try to get the EGR and/or O2 system ready. Oh, and BTW, I don't know what that CO2 is all about since there is no such thing. Something is likely getting misinterpreted between you and the testers. Anyway, on to the system readiness test.
First off, you need to start the engine when the coolant temperature has reached about 14ºF-95ºF. Next, you have to let the engine idle until it reaches 158ºF. Let is idle for an additional 2 minutes after reaching 158ºF. For some reason I'm thinking that the engine is NOT getting warmed up sufficiently. This could be caused by a thermostat problem or the ECU not properly reading the coolant temperature. That is why a reading from a scan tool of the actual coolant temp is very important to know.
Finally, go driving at about 50-55 mph for about 4-5 minutes of so. The engine temperature should not drop below 158ºF during these tests or you will end up with the systems not being able to complete its driving cycles.
If you don't want to go driving around then lift the front wheels off the ground and do the tests in your driveway. One good thing about this way of testing is that at least you won't have air blowing through the radiator which could be lowering the engine temp, if it was already marginal, and affecting the test.
Good luck and let us know what you've found.
Last edited by jserrano; 01-20-2010 at 02:56 PM.