Can I reset the ECU and pass emissions with a CEL on?
#1
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Can I reset the ECU and pass emissions with a CEL on?
Ok so I have test pipes on my car with an exhaust. Need to do emissions like this week, so after reading a bunch of threads on emissions, i know each state is different....
but, if I reset my ecu (disconnecting the battery) this will clear my car of any lights. I can drive to the place which is 5 miles away and pass right??
only hesitation is, does the car save the previous data with the CEL on? If so ,then im screwed.
just need to know if this works.
Thanks
but, if I reset my ecu (disconnecting the battery) this will clear my car of any lights. I can drive to the place which is 5 miles away and pass right??
only hesitation is, does the car save the previous data with the CEL on? If so ,then im screwed.
just need to know if this works.
Thanks
#3
Damn Noobs
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Also the computer needs to go thru the readiness(cant remember exactly what its called) tests before it will let you pass the test and that takes at least 75-100 miles of driving.In maryland they will not pass you untill the computer has passed all these tests first....but i dont know how your state does it.
#5
350Z-holic
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Most states that do ODB checks know all the tricks. The ECU must be in a "ready" state to pass, that occurs after a normal "drive cycle" following an ECU reset. A drive cycle usually takes a week or so to accomplish by itself. Of course, once you start driving around, the CEL will be back on from the TP. Re-install your cats, drive it for a week then take it in.
#6
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i have test pipes and im supercharged and dont have a check engine light or anything, theres no reason u should have lights on ur dash..what test pipes do u have? get ones with defoulers or put defoulers on the ones u have...u will need to clear the ecu by driving about 150 miles after the light is out on the dash..
i have berk test pipes and have never had a light on, as far as a visual inspection i dont have to worry about theres ways around that with knowing people..but i still have to pass the obd test and i cant stand if a car has the cel on it drives me nuts so i make sure it will never happen
i have berk test pipes and have never had a light on, as far as a visual inspection i dont have to worry about theres ways around that with knowing people..but i still have to pass the obd test and i cant stand if a car has the cel on it drives me nuts so i make sure it will never happen
Last edited by tylerxfire; 12-09-2009 at 06:54 PM.
#7
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After an ECU reset previous CEL codes are GONE - there is no permanent memory of them. You can pass OBD with a car that throws a code by driving the pattern to set the sensor to ready on the first drive cycle following an ECU reset (follow the pattern in the FSM exactly to set all sensors to "ready"). You can check readiness with most good OBDII readers (not Cipher unfortunately ). Then turn the car off. Then drive to go get tested without turning the car off again. The technician must drive the car in to be tested, turn car off, restart, plug in OBD cable, and you will pass (you will have a pending code but no CEL and you will pass).
Cheers.
PS. Your persistent CEL light will come on by the 4th drive cycle, but you should have passed by then.
Cheers.
PS. Your persistent CEL light will come on by the 4th drive cycle, but you should have passed by then.
Last edited by rcdash; 12-10-2009 at 05:19 PM.
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#8
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After an ECU reset previous CEL codes are GONE - there is no permanent memory of them. You can pass OBD with a car that throws a code by driving the pattern to set the sensor to ready on the first drive cycle following an ECU reset (follow the pattern in the FSM exactly to set all sensors to "ready"). You can check readiness with most good OBDII readers (not Cipher unfortunately ). Then turn the car off. Then drive to go get tested without turning the car off again. The technician must drive the car in to be tested, turn car off, restart, plug in OBD cable, and you will pass (you will have a pending code but no CEL and you will pass).
Cheers.
PS. Your persistent CEL light will come on by the 4th drive cycle, but you should have passed by then.
Cheers.
PS. Your persistent CEL light will come on by the 4th drive cycle, but you should have passed by then.
here in ny state just like im pretty sure everywhere else is that does this u will not pass the test if u just turn the light off and the code is still pending..u have to drive thru a complete cycle which is about 100-150 miles depending on the car without the light coming back on and then get tested
Last edited by tylerxfire; 12-10-2009 at 07:12 PM.
#9
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Ok so I have test pipes on my car with an exhaust. Need to do emissions like this week, so after reading a bunch of threads on emissions, i know each state is different....
but, if I reset my ecu (disconnecting the battery) this will clear my car of any lights. I can drive to the place which is 5 miles away and pass right??
only hesitation is, does the car save the previous data with the CEL on? If so ,then im screwed.
but, if I reset my ecu (disconnecting the battery) this will clear my car of any lights. I can drive to the place which is 5 miles away and pass right??
only hesitation is, does the car save the previous data with the CEL on? If so ,then im screwed.
#13
Administrator
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Also the computer needs to go thru the readiness(cant remember exactly what its called) tests before it will let you pass the test and that takes at least 75-100 miles of driving.In maryland they will not pass you untill the computer has passed all these tests first....but i dont know how your state does it.
#14
New Member
iTrader: (18)
here in ny state just like im pretty sure everywhere else is that does this u will not pass the test if u just turn the light off and the code is still pending..u have to drive thru a complete cycle which is about 100-150 miles depending on the car without the light coming back on and then get tested
Last edited by rcdash; 12-14-2009 at 09:07 AM.
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