Engine 98 Corolla OBD-II scan...

98 Corolla OBD-II scan...

I got the chance to drive my friend's mom's '98 Corolla 4-spd auto the other night. I linked up to the OBD-II with my PDA and fuel trims were good (-7% to +5%), so that was fine and indicates a good closed loop operation. The engine has great power (I was a bit surprised, actually).

However, when running through the O2 sensor outputs, the pre-cat sensor was good and toggled from 0.1V to 0.8V quickly enough, but when holding the gas pedal to the floor while accelerating, it maintained 0.3V. Why does it do that? It should go into open loop and read about 0.85-0.9V @ WOT (WOT enrichment). My 2003 Corolla does, at least.

Trav

When you hold gas pedal 100%. It should go into open loop. But the OBDII O2 show 0.3V, it is mean the fuel is not enought!!
Check the injeter or fuel pump first.

What type of reader do you have? I would love to test mine, but I know nothing about that type of testing. The place my wife works has a code reader, and I use that all the time, but I don't know how to read actual values. I assume this uses the diagnostics plug under the hood, not the one down under the dash?

yeah i would like to get one of those i have a 98 4 spd auto

It uses the one under the dash.

I have the Elmscan (www.scantool.net) and I have an Audiovox PDA running OBDGauge (it's freeware). I purchased Digimoto for my desktop and got a PDA version for free (www.digimoto.com). I like OBDGauge better than the Digimoto because it's faster, and will show pending codes as well as active ones.

Trav