It's time for my California smog check so I must remove the K&N air intake and reinstall the stock air box, I am faily certain I will need to diconnect the battrie inorder to reset the CPU, The question I have is, how many miles will I need to drive to reset the obd codes before I can pass smog. I just got my Reg. info yesterday and must get the smog ckeck on monday as I am having screws put in my left foot on tuesday and will not be able to drive my car for three months ( Can't use the clutch with a cast)
How many mile do I need to put on my car to reset codes for smog check
Posted March 06, 2010 - 02:14 PM
PCA member since 1978
Has someone helped you with a good solution to your question(s)? If so, give them a reputation point by clicking the arrow at the bottom right corner of any post.
Posted March 06, 2010 - 02:42 PM
Disconnecting the battery will not erase codes in the DME/ECU. You will need a code scanner to clear the memory. Also, I believe that California requires all readiness flags be set for the emissions check. If you reset the computer and then take the car in you will be failed and told to return when all readiness tests/flags are complete. Depending on your driving, this could take a day or two to complete.
Posted March 06, 2010 - 08:44 PM
Thanks Loren, I appriciate the help.
and, of course, remember your first amendment rights...
1979 911SC (sold)
2006 Lexus RX330
Chamber Music, Porsches, Marriages
Bourbon and Scotch Whisky/Swing and Tango Dancing
Have Viola, Will Travel
Posted March 07, 2010 - 05:02 AM
@ goldenwarrior1, eventual fault codes and actual values, stored in the DME, and relating to the environment will be erased by disconnecting the battery. That's mostly the problem in environment test performing.
RFM, True, however the code itself will not clear until manually reset or the vehicle completes enough drive cycles after the fault is fixed or goes away. Unless of couse I have misunderstood somthing!
Posted March 11, 2010 - 06:55 PM
The 996 OBD II manual states that, when faults have been erased, two "trips" are required to "initiate" the "readiness code". A trip is defined as a period of time, not miles, specifically 1150 seconds. Readiness code
I've inserted the two definitions for Readiness Code and Trip (note the clause regarding power disconnection):
Readiness codeThe readiness code indicates that the required fault checks were performed by the OBD system. It is not important whether or not a fault was found. The readiness code is reset if the fault memory is erased or the power supply (terminal 30) is cut off when a code is stored. The readiness code is not reset when the battery is disconnected if no fault is stored. To initiate the readiness code, at least two trips have to be completed.
TripA trip is a driving cycle after a rest period that enabled the diagnostic system to monitor all components and systems at least once. In the event of a fault, it may not be possible to perform all diagnostic routines under certain circumstances. For this reason, a replacement trip is recognized after an operating period of 1150 seconds. In other words, a driving cycle is recognized as a trip after this time, even if not all diagnostic routines were performed.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users