Open loop indicator. Toyota 4AFE
 

Is there any easy way to tell if my engine is in open loop? Any way to easily wire a light or diode into the diagnostic port connector? What terminals?

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Get a Ultragauge.

UltraGauge OBDII Scan tool & Information Center


Located in the top right corner of the Ultragauge is a icon that is shaped like a oval. If the oval is broken it's in "open loop". In "closed loop" it is whole.


Pictures of the Ultragauge in open and closed loop can be found here.

https://www.google.com/search?q=ultr...X5A2UQ_AUIBygC


:)

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I should have mentioned the car is OBD I