nine9six

This did not occur on my car, 96 OBD II with Actron 9580 generic code reader.

mpruden

I stand corrected.

spikej

this is quoted from pilma007 and it worked for me first time.



Hi, I have a 1996 993 and tried the BMW routine... well, I did 2 trips and nothing. Just add miles to the speedometer, nothing else.
The ODBII does not go by speed but by RPMs. That's way the BMW routine does not always work.

After reading "The Essential Companion", Adrian Streather, (great book by the way), I follow his routine. I drove about about 30 miles and got all readiness flags green at the end!!

Here it goes the right routine. Start with the engine cold.

1. Idle (Park for Automatic Transmission or Neutral for manual T ) for 10-15 min
2. Drive 8 miles @2200 RPMs
3. Drive 5 miles @2500 RPMs
4. Drive 8 miles @1800 RPMs
5. Idle (Park) for 3 min.

- You cannot turn off the engine between steps.
- You can slow down in each step (for stop signs or traffic, etc). If so, just extend a bit more the miles. The most important is that you have a constant period of time at right regime. The routine already includes plenty of margin.
- Never exceed 2800 RPMs.
- In my case I just took a rural 6 mile road with not much traffic and travel back and forward. On the 8 miles step, I had to stop to turn around. No problem with that, just extend the leg to 10 miles.

Tomorrow I'll do the State Inspection!!
Give it a try folks!

gmorat

I just tried this and it didn't work. Then again, I probably should have asked a pertinent question before I did the cycle. Is there a speed you can't exceed? I did this on the freeway at around 60 for the second step and 55 in 5th for the 3rd step and then 6th at around 50 for the 4th.

I'm getting desperate as with 4 hours between runs and midday traffic impeding runs during the day, my weekend is turning out to be a frustrating one.

I did 2 runs yesterday of the BMW cycle and got nothing, but then again, I didn't wait 4 hours between the runs as I hadn't seen that tidbit at that stage.

Any help would be appreciated. Getting desperate.

G

spikej

I'm not sure about the speed limit but i didn't exceed 50. Did it on the street that was long without signals and just kept making u-turns. My guess is that your speed was too high.

You may want an obd reader as well to check status in real time.

nine9six

By spikej:


By spikej:
...draw your own conclusions on the "right" drive cycle, guessing aside.


With all 5 drive readiness codes at (inc) incomplete; I used and adhered to the BMW drive instructions on my 96 C2. It was a one and done situation.

For safety sake, I performed the drive at 3:00 am on surface streets, and then on a Socal fwy., in the right lane, with the emergency flashers on.

Here's the simple version:

During the drive cycle, do not exceed 3,000 rpm or 60 mph.

Start engine, let idle 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. Then:

Idle in Neutral for 5 mins. (manual trans.)

Idle in Drive for 5 mins. (Tiptronic trans.)

This is the "BMW" drive cycle, but it works equally well on 993's and if done properly, does not require a second drive cycle.
__________________

gmorat

Just complete another BMW cycle to no avail. I could scream at this stage.

G

gmorat

...and another one.

71-3.0-911

Isn't there a way to have all the codes set by a shop with a hammer or pst 2? At this point, it may be your best option.

richardew

Here is what I got from the dealer. I faked my way through emissions testing for 10 years in PA. Initially one of my SAI ports was clogged, but it would take 500-1000 miles before it threw the CEL. I imagine that more are clogged up because now I can't get it to reset and I drive less than 5000 miles per year and it's exempt. I would take a 15-30 minute drive early in the AM when there was no traffic and take a leisurely drive, keeping the rpm's less than 3000. You need more than 10 minutes for some of the flags.

gmorat

I look at this and for the life of me I can't figure it out. Why is it out of order? If it were to be compiled into a sequence of events that made chronological sense, what would it look like?

1. Do this for zippy second etc.
2. ......

(please don't tell me it would look like the BMW cycle!

Thanks

G

gmorat

Catalytic converter has to be 300 degrees before diagnosis can begin.

Diagnosis can only possible after 600 seconds AFTER catalytic heating cycle is complete.

1. 1400-2800rpm for 300 seconds.
2. 1400-3000rpm for 120 seconds.
2? 1560-2120rpm for 40 seconds.
3. 680-2800 rpm 120 seconds AFTER engine starts. (Isn't the car meant to idle for 10 minutes prior to testing)
4. Idle for 20 seconds.
5. Engine speed not relevant. 50 seconds. Starts 250 seconds after starting (starting what? The engine for the test?)
6. Idle speed. 50 seconds. Adaption should occur after adaption of range 2.

Which of these run concurrently? Which have to be in sequence?

The not at the head saying .9 to 1.3ms 1800-2000rom=>keep car in this range for diags? Last word is a jumble?

That note seems to indicate that the sweet spot for a lot of these cycles is 1800-2000. Do you just drive around at 1900 rpm for x minutes and flag them all?

What does the load measurements refer to? e.g 0.9 to 5.0 ms, 50 to 250 kg/h?

Thanks

G

Quadcammer

Very odd that there are such extreme differences in resetting this.

I reset my codes over the weekend and have driven the car under normal conditions for the past two days. Redline, over 60mph, no prolonged idling, etc.

Monitors are ready.

Wonder why its so different.

richardew

The OBD II test drive is difficult to understand because it is written in Porscheagese!

gmorat

Yes, I noticed.

Do the flags have to be cycles in order? 1,2,23,4,5,6?

The second 2 has a caveat that diagnosis is only possible after 10 minutes BUT
the tests leading up to that point account for only 7 minutes!

There's a caveat on 1 that says that the Catalytic converter has to have reached 300 degrees cent. How do you know how long that is? Is that achieved by idling for a period of time at the head of the test cycle?

So...

1. Turn on and idle for 10-15 minutes
2. Drive between 1800-200rpm for 10 minutes
3. This should trip after 2(a) and 2(b) as it is re-setable 120 seconds after engine start.
4. Idle for 3 minutes to reset the rest?

Does this sound right>?