Code P0171 — 2001 Toyota Celica — Honda Accord Forum — Honda Accord Enthusiast…

26 Фев 2015 | Author: | No comments yet »

Code P0171 — Toyota Celica

I need input on a troublesome P0171 in my 2001 Toyota Celica. code indicates system too condition. This is a 4-cyl, engine.

Problem arose after replacing MAF sensor w/ new to fix a MAF code (P0101). This has not returned.

Car runs fine and got to 40mpg on long trip. My scanner indicated the Long Fuel Trim (LTFT) the limit, +38% which the CEL. Short Term Trim was negative (lean Monitoring the primary o2 sensor higher voltage (high 02) much more frequently low voltage.

The list of faults leading to are: Air Induction system Injector blockage, Mass Air Sensor, ECT sensor fault, Pressure, Gas leakage in exhaust (ahead of O2 sensor), open/short in o2 ciruit, and O2 sensor performance

I checked exhaust system for leaks and found nothing.

I the air intake and vacuum lines for and initially found nothing I cleaned PCV and cleaned new MAF. output indicates stable MAF at idle and linear increase in air w/ rpm.

I ruled out injector faults as car fine, accelerates fine, and runs fine.

ECT temps scanner are in line w/ expected warm temps (200-205F) so no here.

Fuel pressure is a problem, however there is no to tie in and check pressure. It requires a tee w/ special fittings to measure One of my checks for intake air leaks was to the fuel rail and inspect the seals. In doing this I there is subjectively good pressure (not unexpected it starts and runs OK). low fuel pressure would in a lean condition, leading to O2 sensor readings. This seems unlikely but I don’t much left to investigate. Holmes said something the lines When all other have been eliminated, the possibility must be the solution no how unlikely. I’m there. I

Toyota Fine N

I replaced O2 sensor since it had a few miles w/ a Denso universal. No change in O2 sensor readings before to after replacement.

A closer inspection of the PCV hoses some cracked ends. I the ends, and now notice that seems to have stabilized at 25%, high but not enough to set

I performed a further intake air and system leak check first throttle body sprayed on potential leak Nothing found. I next injecting smoke using air to pull smoke from a into a vacuum line. of stinking smoke that found its way out of intake air inlet. No smoke indications.

I’ve now reached point either I try to rig fuel pressure system. A difficult task sourcing of special quick hose fittings. It appears replacing fuel pump, fuel pressure regulator not be much more difficult or so that is my plan. Fuel is accessible through a removable beneath rear seat.

My is does anyone see anything overlooked or something else to other than fuel

Thanks for reading. As you might I’m a little frustrated.

Toyota Fine N
Toyota Fine N

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