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william_b_noble

OBD II)

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well, I've got the "non continuous monitor" issue again

Car = 97 993 Cab

- I have been testing various OBD scan tools to read engine parameters

trying to find something that would be suitable for this car. One

vendor I went to visit saw the Check engine light on and cleard it

before I could stop him. So, now it's a matter of hitting the exact

drive cycles to set these monitors. These are catalytic converter,

evaporative system, secondary air system, O2 system and O2 system

heater.

I have a copy of pages B3 and B4 from the porsche service manual

(Porsche faxed me these pages, they aren't in my set of factory

manuals) that describe "driving conditions for reaching readiness

code". It says that two trips must be run (that's pretty clear). It

then lists 6 cycle flags and the conditions for each.

The first is "Catalytic Converter Efficiency" (cycle flag 1). It says

"the diagnostic procedure takes a total of 300 sec. The engine must

run through 4 speed and load ranges. The procedure isinterrupted when

the engine leaves the relevant ranges and continued again when the

relevant speed and load ranges are reached again. This means that it

is not necessary to run the engine in these ranges for a continuous

period of 300 sec."

"Manual Transmission"

Engine speed: 1120 -2,800 RPM

Engine load 1.0-3.0 ms

Calculated catalytic converter temperatu4re >300C"

ok, now how the heck can I make sure I hit these conditions? I have

two OBD code readers - the one I would prefer to use is the AutoXray

6000. That tool has a readout of "load value" which may be the same

thing as "engine load", but the units of "load value" are percentage,

and the Porsche manual talks about "ms" (milliseconds?). I can

certainly monitor RPM, but what are the 4 speed ranges?

Does anyone have more information that might let me set these flags?

The last time I had this problem, the final solution was to pay a

Porsche dealer $350 to drive the car around with their tester hooked

up until all the flags set - there just has to be a better way. Does

anyone have more information, or additional relevant manual pages, or

???

thanks

Bill

www.wbnoble.com

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Bill,

If you have time before your smog test, just go for a few drives. In normal driving, you will provide all of the necessary 'test parameters' for readiness within a couple of days.

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I would suggest you look thru the 993 OBDII manual. It should get you on the right track. The OBDII manuals are written for use with a PST2 but you should be able to adjust the info to the reader you are using.

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Bill,

If you have time before your smog test, just go for a few drives. In normal driving, you will provide all of the necessary 'test parameters' for readiness within a couple of days.

no, that doesn't work - I know it's the theory - the last time I had this issue, I drove 3,000 miles, all types of driving, and it never set any of the non-continuous monitors. This time, it's been 4 days and about 200 miles, freeway and city driving, none have set. These monitors are obviously set in such a way that my "normal" driving does not trigger them.

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well, it was somewhat tedious, but with the help of my wife, (I drove, she watched the display on the scan tool) I managed to get the monitors to set - I used the AutoXray 6000 OBD monitor to watch the engine load, and drove in the RPM range indicated in the manual for about 20 minutes, keeping the continuous driving segments as long as possible. The indicated load is very low, if you don't have the specs or a reader to show engine load, try about 30 mph in third gear with minimal throttle - you want to be between 1500 and 2000 rpm with just a tiny bit of load on the engine, just a little more than idle. And, when you start the car, let it idle until the SAI cuts off (about 120 sec) - don't know if that helped or not, but now I'm happy.

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well, it was somewhat tedious, but with the help of my wife, (I drove, she watched the display on the scan tool) I managed to get the monitors to set - I used the AutoXray 6000 OBD monitor to watch the engine load, and drove in the RPM range indicated in the manual for about 20 minutes, keeping the continuous driving segments as long as possible. The indicated load is very low, if you don't have the specs or a reader to show engine load, try about 30 mph in third gear with minimal throttle - you want to be between 1500 and 2000 rpm with just a tiny bit of load on the engine, just a little more than idle. And, when you start the car, let it idle until the SAI cuts off (about 120 sec) - don't know if that helped or not, but now I'm happy.

Good to know. I had to run mine about 500 miles before I got a good reading. Of course, most of this was freeway driving, so maybe that explains it.

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