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Testing a Throttle Position Sensor 700 1990

posted by  someone claiming to be Steve Ringlee on  Thu Oct 4 08:02 CST 2001 [RELATED]

My 1990 745 has a weird high idle on startup and a persistent high idle around 1000 rpms. I am testing the throttle position sensor (never had any failures before). To my simple brain, this looks like a dual switch: the middle terminal is ground, and the side terminals are either idle (in which case there is continuity with ground) or wide-open throttle (also giving continuity with ground.) When you move the throttle down to idle, the switch clicks and you get a continuous path from the idle terminal to the ground terminal. This tells the ECU that you want to be idling, and it activates the IAC.

In the case of this switch, it does not give this continuity. Anybody ever test one of these before? I am inclined to go buy a new one and see what happens.





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New Testing a Throttle Position Sensor [700][1990]
posted by  someone claiming to be Steve Ringlee  on Thu Oct 4 08:02 CST 2001 >


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