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Crank sensor question

Crank sensor question

Postby hoffman5565 [OP] » Mar 22 2015, 9:02pm

Ok i have a 97 c1500 with a 4.3. I am currently working on a no start problem. I have traced the problem to the crank sensor signal wire. The online guide im using says it should give a 5v on and 0v off signal, but mine is giving a constant 8-8.5v signal. Des anyone know why this is?
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Re: Crank sensor question

Postby Loeper66 » Mar 22 2015, 9:24pm

Well if it is giving you more voltage than its supposed to and not shutting the voltage off it may be that it has fried the relay and the relay isnt regulating the voltage anymore. this could also destroy the sensor itself by getting to much voltage.
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Re: Crank sensor question

Postby hoffman5565 [OP] » Mar 23 2015, 12:53am

Theres a relay that controls it? I have tried 2 other new sensors and get 8v from them as well
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Re: Crank sensor question

Postby 06_z71 » Mar 23 2015, 1:20am

I thought ECMs had internal regulators to step down the voltage to supply the 5 volt reference to the sensors... I may be wrong though.
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Re: Crank sensor question

Postby Loeper66 » Mar 23 2015, 1:26am

If you have replaced the sensor itself, with the same result id say the issue is before the sensor itself.
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Re: Crank sensor question

Postby hoffman5565 [OP] » Mar 23 2015, 2:55am

I was under the impression that the sensor makes the signal and sends it to the pcm.
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Re: Crank sensor question

Postby hoffman5565 [OP] » Mar 23 2015, 2:56am

But i dont know
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