Definitive drive cycle to reset?
#16
05-26-2016, 05:45 PM
Registered User
Join Date: May 2016
Location: Redwood City, CA
Age: 55
Posts: 3
Rep Power: 0 
FYI, after replacing the alternator in my 996c4, followed multiple failed tests due to catalyst not being ready -- even after driving 250 miles -- I followed this cycle more or less and passed. Thanks.
#17
05-26-2016, 08:47 PM
Originally Posted by okcomputer
Hi,
I just got the 60K service done on my car, and the battery was disconnected at that time. I need to get emissions done sometime in the near future, and the procedure to get all states to "ready" seems impossible. I can't see the following events ever happening in the normal course of driving (the info below is what I got when I did a search on this topic here) - link below is 993 specific, but supposed to apply to 996's as well.
Start engine, idle cold for approx. 2 min, 10 secs.
Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
Decelerate and come to a stop. Idle in gear* for approx 5 mins.
Can't think of any place where I could just drive 60 mph for 15 minutes without a stop sign or other slow down. According to the above criteria, if the engine goes above 3k RPM or above 60mph, you have to start over.
Any help or input? Has anyone passed emissions soon after service without going through the above?
Thanks!!
forums.pelicanparts.com/porsche-964-993-technical-forum/382813-obdii-readiness-drive-cycle-procedures.html
I just got the 60K service done on my car, and the battery was disconnected at that time. I need to get emissions done sometime in the near future, and the procedure to get all states to "ready" seems impossible. I can't see the following events ever happening in the normal course of driving (the info below is what I got when I did a search on this topic here) - link below is 993 specific, but supposed to apply to 996's as well.
Start engine, idle cold for approx. 2 min, 10 secs.
Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
Decelerate and come to a stop. Idle in gear* for approx 5 mins.
Can't think of any place where I could just drive 60 mph for 15 minutes without a stop sign or other slow down. According to the above criteria, if the engine goes above 3k RPM or above 60mph, you have to start over.
Any help or input? Has anyone passed emissions soon after service without going through the above?
Thanks!!
forums.pelicanparts.com/porsche-964-993-technical-forum/382813-obdii-readiness-drive-cycle-procedures.html
#18
05-27-2016, 04:30 AM
me too. that "reset protocol" is the same as bmw. it is sometimes difficult to maintain those careful speeds for the protracted length of time and it has to be fairly strictly followed to reset all to "ready". in fact, i had to do it the second time at about 430 am so as not to be hampered by traffic 
#19
01-28-2017, 12:43 AM
Sorry to revive this but can someone confirm if this all has to be done strictly chronologically (i.e. cold idle, followed immediately by 20 mph, then 60 for 15 mins all on the same drive)?
Or can it be done piece by piece?
Thanks
Or can it be done piece by piece?
Thanks
#20
01-28-2017, 01:08 AM
it's definitely, one drive cycle but it's tricky. i screwed it up once and had to wait for 4am to be able to maintain those speeds/revs without traffic around.
if you dont pass the reset on first try, just take it again like a driving test lol
if you dont pass the reset on first try, just take it again like a driving test lol
#21
01-28-2017, 06:48 AM
I just had to do this on my 996. Pre-planned a route and followed the above instuctions...and it worked first time. From what I read, once you get into the long cycle just make sure you don't go over 3000 rpm and 60 mph. I had previously driven 200 miles at highway speeds and the monitors did not reset. Also, I read that you don't have to do the steps chronologically since each step tests a certain part of the emission monitors...but I've never confirmed this.
Last edited by jhbrennan; 01-28-2017 at 06:51 AM.
#22
01-28-2017, 05:31 PM
Registered User
Join Date: Apr 2009
Location: San Jose, CA
Age: 53
Posts: 1,445
Rep Power: 99 
You may have to do it a few times, but confirm that it worked for me. I did have one code not ready, but that worked for a 2002 in OR. A real pita though! Had to do it early in the AM.
#23
02-01-2017, 10:45 PM
What worked for me after trying for many months, was to let the car idle 25 minutes in the morning after sitting overnight.
Mixed driving on the street and freeway, and a week later PASS!!!
Your results may vary
Mixed driving on the street and freeway, and a week later PASS!!!
Your results may vary
#25
07-17-2017, 06:35 PM
What's the easiest way to know if it's ready? I just bought a 996TTS, took it for emissions and was told its not ready, bring it back (I had just cleared the CEL, I didn't know about the ready thing). I then had my shop do the plugs and coils to get rid of the CEL. Drove it for about 100 miles, mixed driving on and off highway. Took it back to my shop who put it on their tester and told me it was ready (they dont do stickers). I took it back to the emissions place that gave me a rejection sticker, and they told me it's still not ready.
I have a bluetooth OBD2 + Torque Pro. Will that or another tool tell me if it's 'ready'?
I have a bluetooth OBD2 + Torque Pro. Will that or another tool tell me if it's 'ready'?
#26
07-18-2017, 06:20 AM
Last edited by jhbrennan; 07-18-2017 at 06:29 AM.
#27
07-18-2017, 03:36 PM
Cold start
15-30 minutes of city driving under 45mph and <3000rpm.
15-30 minutes highway driving
Park car and shut off
Repeat.
Sometimes will take longer if you SAI pump is crappy.
15-30 minutes of city driving under 45mph and <3000rpm.
15-30 minutes highway driving
Park car and shut off
Repeat.
Sometimes will take longer if you SAI pump is crappy.
#28
07-18-2017, 03:37 PM
may as well shake the magic 8-ball trying to reset these cycles from what I can tell. I just drive the car everyday to work and back and for all my errands for the week before emissions and they always reset.
"reply hazy try again later"
"reply hazy try again later"
#29
07-18-2017, 06:41 PM
Thanks, Torque pro shows it's ready but I got flagged here in MA and now have to report to a state run facility. I have no idea why. The computers don't tell you anything at the local inspection stations.
#30
07-19-2017, 03:04 PM
) then re-installing to go get smogged..) is the "catalyst monitor" staying in "not ready". that one's a bi*ch. the others ( SAI/02's/evap etc ) all fall into "ready" pretty easily if you do the reset properly. as of this date, the only ONE now allowed to be "not ready" and still allowable to pass smog cert in Kali is the "evap". they used to allow for 2, now only the evap, since that could be just a bad gas cap causing the not ready.