Question about 2001 Toyota Corolla
Got a P0171 trouble code today. I purchased a reader a long time ago but never had to use it until now. That is why I got a Toyota! :) Here is my freeze data. Hope maybe someone can tell me what it indicates. Speed 59mph Intake Air 100F Lift Bank 1 21.8% 3324 RPM Calculated Load 49.8% Engine Coolant 188F STFT Bank 1 18.7% Fuel System 1 Closed Loop Thanks for you help.
When the fuel trim is high teens or in the 20s then its the MAF that the problem. If fuel trim is normal, 2-5 then its the O2 sensor.
Buy "Electrickleen" at the parts store.
Remove the MAF sensor, WHILE COLD, and blast the wire inside with cleaner.
The "hotwire" gets gummed up and changes the resistance of the wire so you get a bad input to the ecu and it trys to lean out for a rich condition that doesnt exsist.When it cant adjust anymore it trips the po171 code.
Posted on Jun 01, 2009
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Posted on Jan 02, 2017
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