Toyota repair manual and electronic wiring diagram suppliment. Available thru Toyota parts dealers. There really isn't "wiring" inside the mass sensor box itself, so you wouldn't find a schematic in the books, but a check procedure to test them for normal ops in main manual. They are pretty "bullet-proof", so unless you are modifying the sensor for cold air, it is probably NOT the issue... the ECM would lead you to believe it is with the code. (seems to be a common error). Look for mods on the net. Auntetr
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