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From: Hachiroku ハチロク on 15 May 2010 12:59 On Sat, 15 May 2010 01:09:27 -0700, condor_222 wrote: > One possibility I read there: > > Step D. Drive your vehicle for one week under normal driving conditions. > During this period the emissions computer is gathering data and > re-learning your vehicle's emissions components and systems. The emissions > computer OBDII (on-board diagnostics) system must complete at least one > drive cycle (in some cases two or three). A drive cycle is a sequence of > internal tests which the emissions computer runs while your vehicle is > being driven. This insures all emissions systems are functioning properly. > Proper "readiness flags" are set as the computer completes it's cycles. > Test cycles are unique to a vehicle. Certain cycles run under very strict > parameters, and may require extended driving time to trigger on. Cycle > data and readiness flag information is available through your dealership's > service department. The data vary widely. > > > My questions. > > 1) Does Step D make sense, given that I'd erased the codes? If I do > drive the car for a few days like this, should I be able to pass the test? > > 2) If I erased all the codes, are they really all erased? Or, is there > still some log about them? That they were there, I erased them, and they > are just flagged inactive now? > > > Thanks a lot! It knows the codes have been reset recently. And it also has a count of how many 'driving cycles' are on the ECU. In Mass I think it requires 4 driving cycles in order to pass (for some reason the number 2 is stuck in my head, but I think they have made it 4.) The ECU keeps track of driving cycles and the OBDII reader counts them. Drive the thing for a couple days and then go for a retest. As long as the MIL is off, it should pass. |