IIRC - with the CMP circuit you should get a reading of 1.1 to 1.9 Hz when the engine is cranked over. There was a past thread over on "TheDieselStop" on this years ago.


That said, attached is the Ford "CAMSHAFT SENSOR TROUBLESHOOT PDF" (and it doesn't mention a frequency):

Could be a damaged peg on the cam shaft. Could also be "rust jacked", meaning the block surface that the CMP is mated to has rust formation that pushes the CMP far enough away that it does not generate a good signal. But since a new OEM CMP was installed, it would seem likely that the block mating surface was inspected and/or cleaned.


From the 6.0L bible:
107
53
• The camshaft position signal source is a magnetic pickup sensor mounted on the left front side of the engine block.
• The sensor reacts to a peg, pressed into the camshaft at the front of the engine.
• The peg will pass the sensor once per camshaft revolution, the sensor will produce a single pulse correspondingly.
• Camshaft speed is derived from the frequency of the CMP sensor signal. PCM to the FICM so that the FICM can perform fueling calculations.
• The PCM conditions the signal and sends it out as TACH signal for body builder use.
• Diagnostic information on the CMP input signal is obtained by performing accuracy checks on signal levels, frequency, and/or duty cycle with software strategies.
• The ECM needs both the CKP and CMP signal to calculate engine speed and position. The CMP creates a signal that the PCM uses to indicate a particular bank.
• The CMP contains a permanent magnet which creates a magnetic field, when the magnetic field is broken by the peg on the camshaft a signal is created.

 

Bismic - i’m very glad you posted that picture because it is what i was using during the last of my troubleshooting.

Yes, I am not getting any HZ during cranking with the CMP sensor but i am getting voltage as seen in the information of my original post. I believe that is where my problem stands.

Following that link you included - under V4, I am not getting 800-1000 ohms which states to go to step V7.

V7 - This is where I am lost. it states to measure resistance from pins 31 and 43 to ground. On the truck I am working on AND my running excursion with a new harness and cmp sensor. I am getting no resistance at all. Just the meter stating open loop. Link states to “ repair the circuit and repeat “ Am i missing something? because if connector is disconnected and the wiring has no short or breaks, why would there be resistance? I’ve taking all of the loom apart from CMP sensor to the PCM connector and everything is fine, no breaks, sharp bends, etc. And i’m getting .2ohms testing from end to end which spec is within .5ohms.

 

Bismic - P.S. Yes you are correct, I also assumed i had rust jacketing and or broken cam peg. Block was cleaned religiously, down to clean metal so i am confident in that aspect. As far as the peg goes - if it had broken, wouldn’t i not get any voltage while cranking from back probing at the pcm connector? which i am getting and seems to be within normal values as well.

 

Testing (step V4 in the procedure) for resistance between pins 31 and 43 of the PCM center connector (C1381c) is a combined test for the resistance across the sensor, AND a test for an open circuit, AND a wire shorted to ground.

• Too much resistance (greater than 1,000 ohms) then you need to check the resistance in each harness wires (CMP sensor disconnected).
  • If the harness wires are ok, then the sensor is bad.
• Too little resistance (less than 800 ohms), then you need to check for a short to ground.
  • If you have less than 10,000 ohms between EITHER "Pin 31 of the harness and ground", OR "Pin 43 of the harness and ground", then you have a short to ground in the harness.

As stated above, the resistance should be greater than 10,000 for each "wire-to-ground" test. Note that this test is conducted with BOTH the CMP connector disconnected AND the PCM connector disconnected.

Since you tested the resistance to ground individually on each those pins and you STATED that you saw no resistance to ground, then it seems that the test indicates that you have a short to ground somewhere. That said, see runthatjunk's post below to determine if it is actually 0 resistance or an open loop (infinite resistance).

 

Also:

Measure the resistance between FICM harness connector C3 pin 10 and PCM engine harness connector 20. Is the resistance less than 5 ohms? It should be!

Measure the resistance between FICM C3 harness connector, pin 10 and ground. Is the resistance greater than 10,000 ohms? It should be!

 

V7 - This is where I am lost. it states to measure resistance from pins 31 and 43 to ground. On the truck I am working on AND my running excursion with a new harness and cmp sensor. I am getting no resistance at all. Just the meter stating open loop. Link states to “ repair the circuit and repeat “

Go to step 8, the meter isn't reading any connectivity at all, so nothing to repair in regards to a short to ground

 

Did you disconnect the CMP sensor connector before doing step V7?

 

good catch

 

Yes both the CMP sensor and PCM connector were unplugged.

 

I will move onto step 8 in a moment once i get the chance to work on the truck again and post back with results.

 

Step 8 i’ve already done, actually. I. my previous post i stated i was getting .2 ohms from pcm connector to cmp connector which is reason i had put a new cmp sensor in truck. i will do remaining test going to ficm harness and get back with results.

 

Okay so on step V9 I am getting roughly 200MV from pin 10 on connector 3 of ficm harness and ground with pcm connector unplugged.

 

from connector C3 pin 10 and pcm pin 20 is less than 5ohms.
Pin 10 to ground though i am not getting 10,000 ohms. I am getting no reading at all.

 

I think @runthatjunk was trying to tell you earlier that you probably have infinite resistance (open loop). That is what "0L" means on the voltmeter - too large to measure. "No reading" would be a blank screen, all dashes, etc.

So ............. that would indicate greater than 10,000 ohms.

 

delete - double post