cdon Posted May 5, 2007 Share Posted May 5, 2007 Hello, I am ne to the forum. I have a 2001 ES300 with 145,000 miles. It has been great except for two trouble lights that keep coming on. They are Check Engine and Trac Off When I use an OBD scan tool from Murray's, it says P0446 Evap Circuit Vent Malfunction I can reset the codes and they will stay off for several weeks. I notice they come on when the tank is low and/or the temperature changes a bit. Today I was going to reset them but the OBD said P0115 which was engine coolant temperature circuit malfunction. Since I was having some very recent problems with low idle speed on cold start, I suspect this is telling the ECM that the coolant temperature is already hot and not to enrich the mixture. I also realize this can be caused by the plugged throttle body air control valve. My question is how do I find out what component to replace? Is the some temperature sensor somewhere that has failed. Thanks for any guidance you can provide. cdonpaul Chelsea,MI Quote Link to comment Share on other sites More sharing options...
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