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Originally Posted by Inthemedia
Unplugging the 3-prong TPS connector should raise idle by around 300 RPM. If you unplug the connector and nothing happens, this points to either a defective TPS, a bad ICU, or a bad ground connection (middle pin) on the TPS female end of cable. (see my previous post for testing the TPS). Possible causes for a defective TPS include a chaffed or broken wire in the cable, dirty switch contacts, misaligned switch, or internal switch malfunction.
T.C.
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Start the engine, idle at 1400 RPM. Unplug the connector and nothing happens. Put a digital multimeter between the middle pin and the pin furthest from the CSI, the reading goes up to max and down to about 2 but never 0. Shut the engine down, and measure again, got max indicating an open circuit.
My question to you now is about replacing the TVS. The part itself can be had for about $40 everywhere on web. But removing the two screws at the throttle body seems very hard to me. In the 07.3-220 and 07.3-230 sections on shop CD, it seems to suggest that one must remove the whole air guide housing to access those two screws. Any tricks? Is it really a DIYable job?