Camshaft position wave form

Michael Technician Michigan Posted   Latest  
Unsolved
Electrical
2016 Ford F-250 Super Duty XL 6.2L (6) 6-spd (6R140)
P0365 — Camshaft Position Sensor "B" Circuit Bank 1
P0369 — Camshaft Position Sensor "B" Circuit Intermittent Bank 1
P0390 — Camshaft Position Sensor "B" Circuit Bank 2
P0394 — Camshaft Position Sensor "B" Circuit Intermittent Bank 2
Rough Idle
Stall

vehicle has rough idle that will come and go, sometimes stall out. Runs fine off idle. Intermittent circuit codes for camshaft position sensor. Ford changed sensor style in 2013 3 wire. Sensor is now powered by 12v instead of 5v. Scope wave form for both camshafts and crankshaft are all good, except the camshafts will pull voltage from 5v down and return to 5v, with 12v feeding sensor should it return 5v or 12v. I have alldata for service info and the compon description does not give any indication of what PCM is looking for as far as voltage.

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Boyd Technical Support Specialist
Georgia
Boyd
 

If it is a simple on off switch it will produce a 12 volt square wave. If it has a built in resistance it could deliver a 5 volt or other voltage square wave. This would be similar to Chrysler feeding 8 volts and delivering a 5 volt signal.

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Michael Technician
Michigan
Michael
 

Understand that principal. But I can not find any definitive data to prove if it is indeed a 5v return. I am tempted to purchase a new sensor and trigger it on the bench to prove function. Thank you for your input!!

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Ray Diagnostician
Ontario
Ray
 

2014 F-250 6.2 cmp ckp and the cmps are toggling at 5v. HTH

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Stephen Technician
Tennessee
Stephen
 

I think that the 5V on the signal line is supplied by the ECM. The 12v of the sensor only feeds the switch circuitry inside the sensor to pull the ECM supplied 5V down and release it. Unplug the sensor and see what the voltages are.

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Eric Owner/Technician
Wisconsin
Eric
   

In AllData under the pinpoint test DR: Camshaft Position (CMP) Sensor: Introduction (not the pinpoint test: DR: Camshaft Position (CMP) Sensor: Pinpoint Test) is a list of each vehicle and what type of CMP sensor they use. It has been my experience that they pull the 12 volt reference to ground. I haven't seen the exact vehicle you are working on yet but all the vehicles I've seen with a…

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Ray Diagnostician
Ontario
Ray
 

2016 F-150 5.0, the intake cmp measures 12.78v

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Rudy Technician
Utah
Rudy
   

BTDT- Yeah Ford service info can be confounding sometimes. In my case it was still 5v. Different engines may have different strategies on these trucks. diag​.​net/msg/m4coylbatt…

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