When you erase a code (large evap leak) do you also erase the driving cycles. Very quick summary: Battery was disconnected for a couple of weeks while changing out coil packs, plugs and wires. Vehicle failed inspection because drive cycles went away and evap system showed as not ready...Posters here pointed out vehicle had to be driven to reset drive cycles...Husband filled gas tank and we drove. Once drive cycles reset, vehicle popped a large evap. leak code. Checked gas cap, was not properly sealed. Need to take for inspection, can we erase the code and go, or do we have to reset drive cycles all over again?
Many thanks for all help so far. Most have proved to be right on the money!

 

erase code and go

 

I'm not 100% sure on that, I do believe that erasing any codes resets the whole ECU and you will need to do another drive cycle.

 

maybe I am wrong bout the drive cycle. obviously it varies from state to state but here in NY. If there is no CEL light and the exhaust passes the sniffer you are nearly good as gold. then its tires, brakes, horn, lights and wipers. i could literally erase my codes, hand over the keys to the mechanic for a quickie and be good 2 go. Thats why its key to have a good relationship with your mechanic. but from what i understand those Cali tests are hard as ****. I gave my guy the RAVE manual and he thought i was a god as he was so scared of Land Rovers. As for the large EVAP leak, i had an error for one, replaced the cap with an aftermarket, still had evap code. replaced it again with an OEM and its been fine since.

 

I believe that is correct, Spike. Once the ECU has been reset, it is going to take different drive cycles for all of the equipment monitors have run. I further believe (my city does not perform emissions tests) that the first thing an emission station station does is to make sure the SES light performs its self test (illuminates when key on), then, if it goes off as normal, they check to make sure all the monitors have been run. This is to make sure someone doesn't have a serious emission problem, and clear the codes right before testing.

Bottom line (and I am 99% sure on this) is: You are going to have to fix the problem, then perform however many drive cycles it takes for the ECU to make sure that passes. Last time I checked, there were something like 8 different drive cycles for these things, depending on what the monitor was for.