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Getrag Gearhead
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1,872 Posts
It goes into closed loop once the negine has over 255 seconds run time and the ECT is over 155 deg F.

Joe.
 

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Getrag Gearhead
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1,872 Posts
This is information that I can get from the Toyota technical guys. I don't believe this info is available in any factory service manuals. This info is available buy using the Vetronix MasterTech diagnostic scan tool to either the diagnostic port on the OBD cars or the OBD-II port under dash and inspecting the data from user selected data list.

Even though this tool is for inspection of the ECM, you really need to know what you are doing with this tool.

Joe.
 

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82 Posts
What year is your car? If it is 96 up then it is OBDII and you can get an OBDII reader and it will tell you when you go into closed or open loop. I ran a TRD thermo on my 96 S/C'ed 4Runner and it would run about 170 deg on the 160 thermo and would always go into closed loop.
 

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Vengeance is mine
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907 Posts
Bad o2 sensor(s) can cause your car to stay in open loop, On my gs300 it caused a "coolent temp" code if I remember correctly but all it was was an 02 sensor gone bad.
 
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