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SportTrac Discussion
Engine & Drivetrain
Mass Air Flow Sensor or O2 Sensors Needed?
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<blockquote data-quote="Lloyd Chaudoin" data-source="post: 1008285" data-attributes="member: 70555"><p>Oh Jeeez, an analog voltmeter will not and can not short out an ECU. Particularly in an ohm measurement mode. The TPS is a simple pentiometer. Hence, voltage in ( 5 volts ), a reference wire usually right below or at 1 volt @ idle ( key on engine off ). And a ground wire. Once probed to figure out which wire is which. It can be tested disconnected and key off. It is a simple resistance test across the voltage reference circuit. If the gauge sweeps smoothly it is fine when throttle is moved ( in our case the TPS would have to be removed to simulate throttle movement ). This is something that can't be analized on a digital meter or watching a scope and activating the throttle... I have done this dozens of times on my SVO, Cobra, Ranger and Explorer.</p></blockquote><p></p>
[QUOTE="Lloyd Chaudoin, post: 1008285, member: 70555"] Oh Jeeez, an analog voltmeter will not and can not short out an ECU. Particularly in an ohm measurement mode. The TPS is a simple pentiometer. Hence, voltage in ( 5 volts ), a reference wire usually right below or at 1 volt @ idle ( key on engine off ). And a ground wire. Once probed to figure out which wire is which. It can be tested disconnected and key off. It is a simple resistance test across the voltage reference circuit. If the gauge sweeps smoothly it is fine when throttle is moved ( in our case the TPS would have to be removed to simulate throttle movement ). This is something that can't be analized on a digital meter or watching a scope and activating the throttle... I have done this dozens of times on my SVO, Cobra, Ranger and Explorer. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Mass Air Flow Sensor or O2 Sensors Needed?
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