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Old 01-08-2007, 09:35 PM   #1
ratso
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Default "Drive cycle" procedure??

I have an 02' Legacy, 2.5L. When I hook a scan took to the OBD port, it flashes the O2 sensor monitor(no trouble codes though). According to the scan tool manual, this means the system monitor has not yet run and finished it's self diagnostic test. It says I need to complete a "drive cycle procedure" to complete the test so the flashing indicator clears. What is the drive cycle procedure??

Thanks,
Jim
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Old 01-09-2007, 12:22 AM   #2
fibuz
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Drive it around for a tank then recheck? It hasn't learned any value because of a recent ecu reset(battery disconnect) or something? That would be my guess.
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Old 01-09-2007, 07:00 AM   #3
ratso
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Been driving it for 3 years. It has never had the battery disconnected or the ECU reset. Isn't there some sort of "drive cycle" step by step procedure?
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Old 01-09-2007, 08:56 AM   #4
Patrick Olsen
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None that I've ever seen.
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Old 01-09-2007, 10:38 AM   #5
Wiscon_Mark
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Quote:
Originally Posted by Patrick Olsen View Post
None that I've ever seen.
No, you just drive and it gets used to your driving style and maps the fuel accordingly.
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Old 01-09-2007, 12:16 PM   #6
LetItSnow
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There is a drive cycle; it's pretty much universal for all OBD-II cars. It pretty much requires a tremendous amount of open space. I just tried searching for it... I know I posted it somewhere. Either way, it's a ridiculous amount of heat up, cool down, variance of and holding speeds, and so on. In your day-to-day driving, the registers should find their way to READY.

Was your O2 sensor nicely heated when you plugged in? I'm guessing that's your problem. Where are you located?
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Old 01-09-2007, 03:54 PM   #7
ratso
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Originally Posted by LetItSnow View Post
Was your O2 sensor nicely heated when you plugged in? I'm guessing that's your problem. Where are you located?
I assume it was hot. I had just driven 70 miles. I live in Northeast PA.
I am going to try this scan tool on my other Subaru, it is a 97 Legacy GT, and see if it reads the same error.
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