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Your readings are fine. I would definitely........ (archive)

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Posted by John A on January 09, 2002 at 15:56:32:

In Reply to: John A. - I just went out and tested the posted by Jeff E. on January 09, 2002 at 13:03:21:

....clean the terminals, though. The ICV is a double solenoid (linear motor) which is controlled by those transistors in the ECU. Based on an RPM signal from the flywheel sensor, the ECU will adjust the ICV to allow intake air to bypass the throttle, maintaining a steady idle speed. More bypass air = higher idle speed.
The component that tells the ECU that the throttle is closed is the throttle position sensor. It`s on the front of the engine at the end of the throttle butterfly shaft, black in color. It has a connector with three terminals. With power off, unplug it and check for continuity between terminals 2 and 18 (center and bottom terminals). There should be continuity (zero ohms) with the throttle closed. A slight opening of the throttle should cause it to read open (infinite ohms). The TPS also closes between terminals 3 and 18 (center and top terminals) when the throttle is near wide open. Check that there`s continuity between those terminals only when the throttle is opened all the way. There are slots where the screws attach the TPS to adjust it to function correctly. If the TPS fails either electrical test, it should be replaced.

resistance of the connection (the plug on the fuel rail, for the ICV), and my numbers were 19.4 and 20.9 ohms, which looks fine based on what you've said. The throttle cable and its housing look fine as well. I did notice that one of the 3 posts (one of the outside posts) on the connection was pretty oxidized....I had to fiddle with the multimeter probe to get a good reading. I will clean this up with some contact cleaner tomorrow. Do you think this could be the problem? What exactly does this connector do? Does it send a signal to the ICV telling it whether the throttle is open or closed? Anymore thoughts are appreciated. Thanks!

Jeff





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