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Re: I was referring to measuring transistor resistance,
Posted by BobS (more from BobS) on Wed, 2 Nov 2005 19:28:07
In Reply to: I was referring to measuring transistor resistance,, Bill Homer
[Profile/Gallery]
, Wed, 2 Nov 2005 13:42:45
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Bill, you have it right. Although a multimeter measuring Ohms will not hurt the ECU, it is protected againt transients in the vehicle electrical system that have much more energy and voltage in them than a Multimeter.
The ECU BPC driver transistors initially fail by shorting, having very little resistace which allows incontrolled current through the valve. Normally the transistor is "off" which for practical purposes does not allow current to pass. A Multimeter measures the off state as 1 meg Ohms or greater. A shorted transistor will measure anywhere from a few ohms to a few hundred thousand. (100,000).
It is easier to measure the transistors from the BPC harness connector. The ECU contacts are 2 and 26.
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