Camshaft position sensor - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 03-28-2010, 09:26 PM Thread Starter
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Camshaft position sensor

Truck has been running crazy and has shut off a few times so i check for codes and CPS code came up and the back pressure sensor. Replaced the CPS and truck cranked and ran,still havin the other problems to.So i check the back pressure sensor and the tube was stopped up and fixed that and cleared all codes and cranked the truck back up and then i cut it off to check for codes and it did not have any so i cranked it up to drive it and it cut off. Checked codes again and the CPS came back and it would run a minute and cut off,finally it would not even crank again,so i went and got another CPS cleared the codes and it will not crank at all now and not showing any codes. Maybe someone can shed some light on this because i am lost.
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post #2 of 12 (permalink) Old 03-28-2010, 09:39 PM
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Re: Camshaft position sensor

What was the code number?

You might check the CPS connector to make sure the pins are not pushed out the back of them.
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post #3 of 12 (permalink) Old 03-28-2010, 10:48 PM Thread Starter
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Re: Camshaft position sensor

The first time i got codes it was a 340 and a 344 ,so i replaced the CPS and i cleared the codes and it cranked up.I also got a 470 which was the BPS and i fixed it and when i cranked it back up it ran for a few min and cut off and kept doin that and finally cut off and has not cranked since.I checked codes again i got the 344 again,so i replaced the CPS again and it tried to crank but that was it but i checked for codes and i do not have any.I took the plug loose and cleaded it and checked the wires and they seem to be fine but it will not crank.
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post #4 of 12 (permalink) Old 03-28-2010, 10:56 PM
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Re: Camshaft position sensor

You need to verify the Brown/White (BR/WH) wire has 5v and the Light Blue (LB) wire is a good ground, if these are ok suspect another faulty CPS.
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post #5 of 12 (permalink) Old 03-28-2010, 11:05 PM Thread Starter
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Re: Camshaft position sensor

Thanks im fixn to go check that now.
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post #6 of 12 (permalink) Old 03-28-2010, 11:30 PM Thread Starter
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Re: Camshaft position sensor

Just checked and i 5v on the Br/wh wire and the L/blue has a good grd,so what to try next?
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post #7 of 12 (permalink) Old 03-28-2010, 11:37 PM
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Re: Camshaft position sensor

Check that there is battery voltage on the Green wire. If OK, reconnect the sensor, back probe the Green wire and monitor for a signal that toggles between battery voltage and 1 to 2 volts as the engine turns. If you are using a volt meter turn the engine by hand, do not crank with starter.

If not CPS is junk, or there is a faulty connection somewhere else.
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post #8 of 12 (permalink) Old 03-28-2010, 11:55 PM Thread Starter
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Re: Camshaft position sensor

Ill do that. Could the IDM be bad and still have volts at these wires?
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post #9 of 12 (permalink) Old 03-28-2010, 11:56 PM
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Re: Camshaft position sensor

Sure.........
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post #10 of 12 (permalink) Old 03-29-2010, 12:36 AM Thread Starter
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Re: Camshaft position sensor

I got to get some help to spin it over but i do have 12v at the green wire also.
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