closed loop
05-08-2007, 08:34 PM
#2
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Location: Western North Carolina
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05-09-2007, 09:53 AM
#3
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Join Date: Dec 1969
Location: San Diego, CA
Posts: 4,950
Here's a link to Injuneer's site explaining closed loop and much more:
http://members.aol.com/InjuneerZZ/ScanMast.htm
The short answer is:
-The O2 sensors have reached operating temperature and are beginning to cycle above and below 450mV
-The coolant temperature has reached the minimum set in the PCM. This seems to be in the range of 120 -140 degrees F.
-The "timer" has timed out - this seems to vary from 3 to 5 minutes, and seems to be longer in colder weather.
http://members.aol.com/InjuneerZZ/ScanMast.htm
The short answer is:
-The O2 sensors have reached operating temperature and are beginning to cycle above and below 450mV
-The coolant temperature has reached the minimum set in the PCM. This seems to be in the range of 120 -140 degrees F.
-The "timer" has timed out - this seems to vary from 3 to 5 minutes, and seems to be longer in colder weather.
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