Satyr of the Midwest
Join Date: Nov 2005
Location: Ida & Grand Rapids, Michigan, a.k.a The Unemployment Capital of America
Bronco Info: 1993 EB, 5.8L, BIO0 MAF, GT40Ps, Mustang cam, GT40 Intake, Custom Headers, Moates QuarterHorse
You're measuring it wrong. One line is VREF (Brown/White), another is SIG RTN (Gray/Red). Don't pay any attention to the colors on the TPS, but instead look at the actual engine wiring harness. Between those two there should be +5.00V, or within +/-0.05V of that. None of these measurements should be made relative to chassis ground; the sensors are on their own little circuit, as the PCM only looks at the voltages coming back to it relative to those two levels only (not chassis ground, battery positive, etc.).
You should be putting your DVOM's negative lead to the SIG RTN line, and the positive lead to the TP line (Gray/White).
Wheelin' across Michigan from Ida to Grand Rapids, baby!
Nemo nisi per amicitiam cognoscitur -- No one learns except by friendship.
Originally Posted by Adlai Stevenson
Isn't it conceivable to you that an intelligent person could harbor two opposing ideas in his mind?