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There was an error in the original Factory Service Manual.
They did mix up the open and closed values.
Don't bother measure resistance - measure the voltage on the middle pin of TPS. (I used a thin wire strand I run through the connector). Beav is as always correct - you should see 0.5 v at closed and > 4 v at fully open. If you have to adjust TPS - aim for 0.5v at fully closed throttle.
I believe the resistance your mechanic quoted (3.6k - 0.5k) is perfectly normal.
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