yaknart33

When doing the "drive cycle" your fuel level needs to be between one half and three quarters.It affects the monitor self test for the evaporative ,oxygen sensors and cat tests.I have been a smog test and repair tech for over 30 years [now retired] ,the drive cycle monitor test can be tough to complete.Follow the procedure in shop manual .

5CHN3LL

Your oxygen sensors do not appear to be returning any data - voltage nor temp - which makes me wonder if they actually are enabled. If they were enabled but failing, I'd expect to see some values, but your OBD software is indicating "N/A" for both data points...

byroncheung

@garrett376 can you point out where those test functions are in piwis? do you have to drive the car with piwis connected to go through those test functions?

garrett376

Should be under DME: Maintenance and Repairs: Special Function: Short Test

byroncheung

@garrett376 thanks I found them in piwis and tried to do them, however, had mixed results on the lists of tests and I'm not sure if it's ready for test at the inspection station... guess I'll just give it a try (you can find details of my short test results here: https://rennlist.com/forums/997-foru...l#post18530738 )

Mike Dealy

I'd be happy to come by at your convenience.I'm in Pt. Loma Pardon my ignorance, but what is PIWIS?

DBJoe996

Porsche Integrated Workshop Infomation System (PIWIS) / KTS-650. The PIWIS is the latest Porsche diagnostic tool, and is similar to the Porsche System Tester 2 but also supports CAN-BUS vehicles. PIWIS also integrates repair manual information into the diagnostic tester.

Porsche dealers use this proprietary software to set readiness monitors in the ECU so the techs don't have to do the driving required to set the readiness monitors after a car has been in the shop.

944onthefloor

IDK how you guys figured this sourcery out....but I'm super grateful you did!
I live in Denver and took my 2003 996 in yesterday and it didn't pass as the car had been sitting for a bit. I found this thread and followed the directions as closely as I could (I'm adding two more steps for people who live in Colorado):
During the drive cycle, do not exceed 3,000 rpm or 60 mph.

1. Have gas filled between 3/4 - 1/2
2. Start the engine, and let idle for approx. 2 min, 10 secs.
3. Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
4. Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
5. Decelerate and come to a stop. Then:
6. Idle in Neutral for 5 mins. (manual trans.)
7. Idle in Drive for 5 mins. (Tiptronic trans.)
8. DO NOT SHUT CAR OFF
9. The Emissions Rep will make you sign a non-liability clause for not shutting the car off.
10. (Try not to smile too much as this crazy thread you found online actually worked)

That did the magic for me. I should add I didn't have any of the code readers (or apps) that other members are using. I just followed this as close as other drivers on the road would let me!

schnappi

June 2024, can confirm this procedure works on a 996.2
Did not pass due to cat not showing ready on the OBDII. Had driven 2.500 miles since last battery swap. Regular drives don't seem to do the trick, as anything above 3K rpm cancels the cycle, so basically as soon as you leave your driveway.

The drive cycle procedure seems more designed for a controlled dyno setting than open roads. I did the cycle in the evening with minimal traffic. First try, and it worked. In the last step I only idled for 3 min. Drove normally after, did the smog test two days later, so stopping the engine did not seem to have any effect on mine.