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Diagnosing a camshaft position sensor

stryped

By stryped
in Ask A GM Technician

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stryped Enthusiast

stryped

Posted
Posted

What should the voltage be while cranking when checking the camshaft sensor? I am getting a varrying voltage of 13.5-3 volts. My haynes manual is very unclear. I think it said it should be 5 volts but the wording seemed to leave me to believe that any voltage present indicates a good sensor, so I am a little confused.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

how about an alldata account ,$27. for a year,

 

and no one knows WTF year you have for a truck or why you are checking the cam sensor

Portdriver Enthusiast

Portdriver

Posted
Posted

Govtech4 has a way with words. lol

txab Senior Enthusiast

txab

Posted
Posted

how about an alldata account ,$27. for a year,

 

and no one knows WTF year you have for a truck or why you are checking the cam sensor

 

 

 

Govtech4 has a way with words. lol

 

 

 

:lol:

 

He's just saying what many of us are thinking. :lol:

Duelin Enthusiast

Duelin

Posted
Posted

The cam sensor is a hall effect sensor. So voltage is off,on,off,on. When checking you should be turning the engine over by hand (breaker bar and socket on the end of crank shaft). That way you can bring it up to voltage on. And you can see what the voltage is. Should be battery voltage. Also you should disconnect the injectors and ign. voltage.

stryped Enthusiast

stryped

Posted
  • Author
Posted

I disconnected the coil wire and cranked it by hand becasue of lack of help. I dont understand why my haynes manual said 5 volts then? I guess since it went to 13 it is ok. The fluctuating makes sense now if it is supposed to fluctuate between battery voltage and zero.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

1996 silverado and intermittent missing problems.

 

 

thats to bad ,i hate having my truck missing intermitantly as well,i can never find it when it happens...

 

sorry ,i had to ,

 

merry xmas

 

you should hear my parrot joke !!!

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