Re: toyota corrolla t3 1400cc 16 valve P0140 code Archived Message
Posted by Sean Mc Gettigan on June 1, 2007, 8:43 am, in reply to "Re: toyota corrolla t3 1400cc 16 valve P0140 code"
Hi Les, I'll try to answer some of your questions here but the fuel trim info + training I have relates to Bosch systems so may not be correct here but if I'm wrong then I'm sure someone will correct me. "B1 S2. Does this mean sensor 2. After cat?" in this case yes but there are some weird systems that can have B1S2 before the CAT + B1S3 after the CAT(never seen one yet) "It is in closed loop. O2 sensor data: STFT -25% LTFT 25% (O2 A/fs Mon incomplete) (O2 FT B1-S2 99% )" STFT is carried out from the pre-CAT sensor (B1S1) but long term fuel trim is carried out from the post-CAT sensor hence the monitor incomplete in brackets. When started prior to carrying out fuel trim adjustments the ECU tests the lambda sensor signals and responce to mixture changes,if this passes testing ok then it can move onto fuel trim adjustments.The pre-CAT sensor is used to adjust the STFT but the post-CAT sensor controls the LTFT to keep the mixture within the STFT window but at the optimal mix within that window to allow the CAT to work most effectively. But appling the above to your problem I would agree with Tom,first thing to work out is why is the pre-CAT sensor switching normally when the mixture is away off. Hth Sean
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