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Error code 44 when diag pins E1 and Tt are jumpered. Rear wheel speed sensor problem. Not too worried about it since it's summer. I am guessing this sensor is involved in control of the Diff lockup in the event of rear wheelspin?

Great link! Thanks, J

It doesn't do it all the time, but often my "Overdrive Off" indicator blinks rhythmically. Since it seems to keep a beat fairly well, I am guessing it's an error code being displayed? Overdrive works properly even with the blinking. Thanks!

I just bought a 91 Camry All-Trac, and by the time I got it home, it was hot enough to start an idle fluctuation. The engine revs up and down in a rather rhythmical fashion, in neutral and park. If I turn the A/C on, the problem goes away. A/C off and it comes back. If I let the engine cool down for a few hours, the problem goes away. Any ideas? This is my first Toyota. The car runs great otherwise. Thanks! Jesse