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I read all this and the big problem is that the not going into reverse point is debunked 6 posts later. I understand people are trying to help and I appreciate it. The thing that I just don't get is, that if there is a Porsche cycle, even if it's in gobbledegook, why hasn't it been converted to simple steps and shared on the forum?
I may have missed it, but have you tried just driving the car normally for a few weeks?
I may have missed it, but have you tried just driving the car normally for a few weeks?
I swapped the battery out 4 months ago, before Christmas.
Shocking how the Germans thought this was a plan.
G
I got it working tonight. I combined the Porsche test with the BMW test and just....
1. Idled for 2m10s-reversed out of garage and down driveway...
2. Drove for 5m between 1800-2000rpm below 30mph
3. Drove for 15m between 1800-200 below 55mph.
4. Stopped and idled for 5m.
5. Drove different engine loads for 15m never going above 2500rpm or above 40mph.
6. Stopped, tested codes, wept a little at the sea of green.
7. Put car back in garage, drank beer.
What concerns me most is that these flags were reset on the 14th before I handed the car into the shop. When I picked up the car they said it couldn't be tested because the readiness codes weren't set and I thought....Oh, I must have got it wrong. I went home and retested with my ODB2 reader and got different results than I had previously seen.
Now I know that I have reset them again as of last night, but what happens if the car is back to an unready state this morning? Would that be an ECU problem ? I guess I'll know in a while....
On OBDII cars, there are a number of monitors (read: sensors) that are required for emissions compliance. For instance, EGR, SAI, 02 sensors, Catalyst, etc. The ECU tests that each sensor is responding with a value that is in the accepted range. Each test is done at a certain time, temp, rpm, etc (hence the drive cycles). Either the monitor test is not completed (will fail emissions for lack of readiness) or its completed and all is good (ready for emissions testing) or one or more sensors report a value out of range (you get a check engine light or a stored code that turns into a CEL).
I am somewhat of an expert on setting the readiness flags in my 993. For a few years it was an annual exercise. My car would intermittently reset all the flags. So every year when I went to get the emission inspection I would have to do the drive cycle. A few times I would get all the flags set and they would reset before or when the tech started the car for the inspection. I looked for intermittent power and grounds and found nothing. Since replacing the ecu for an unrelated project in 2010 the car has not had the issue.
From my experience it takes two complete 'trips' where each of the 'steps' have to be completed successfully. The steps for each trip don't have to be done in sequence and the trips don't have to be in succession. On my car, no flags were set until both trips completed. I have seen all of the flags 'set' after completion of the second trip and before the car is stopped. And I have seen them set immediately when the car was started after two successful trips. The SAI and tank venting tests (1 and 4 below) can be initiated with the porsche tester but then the other steps of the 'trip' (2 and 3) must be done without turning the car off. When the SAI pump finishes running after cold start the catalyst should be up to temperature. That is the purpose of the SAI system.
I used the BMW drive cycle as posted by nine9six.
During the drive cycle, do not exceed 3,000 rpm or 60 mph.
1. Start engine, let idle for approx. 2 min, 10 secs. [I start the car when it is cold and let it idle until I hear the SAI pump shut off. If the pump doesn't run the trip will not be successful. Then I back out of my driveway and drive below 3,000rpm and under 60mph to a place where I can continue the sequence.]
2. Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.
3. Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.
4. Decelerate and come to a stop. Then:
Idle in Neutral for 5 mins. (manual trans.)
Idle in Drive for 5 mins. (Tiptronic trans.)
FYI - Pretty sure my CDR210 doesn't clear the presets on a battery disconnect. It does prompt for the unlock code though.
If you clear your codes via a code reader, you will also clear out your readiness flags. Perhaps someone accidentally cleared the codes?
This is exactly what happened to me this morning. Went for a drive early (Sunday) and got all but the O2 to show green/ready. Got a P0112 intake code, stupidly decided to clear it, and now I'm back to five unready sensors. Time for another drive. Thanks for posting this, as I was starting to go a little nuts.
03-28-2016, 09:57 PM
