camshaft position sensor troubles
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camshaft position sensor troubles
I'm popping the code for a camshaft pos signal output circ/open. I cleaned the connector, checked the wires. No problems there. Replaced the sensor with no results. Running down the road she will run smooth, then pick up a slight miss, then completely cut out or buck for a second. The right back to running smooth. if I clear the code, it takes anywhere from a hour to a few days to come back. All this is on a 05 250. No other codes.
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From: Laurel, MS
If you did not check the wiring back to the PCM you may have a chafed wire somewhere. PITB to find sometimes. You may be getting some noise from the CKP. Is there any special occurance during driving that sets the code? Hard turn, sudden accel or stopping, rough driving surface? If you check the tech folder you can find the PCM and check the ohms on the #31 + pins. OHMS between 3-7 at 70 degrees would be ok, anything above 7 (the higher the #=more resistance) would be a bad circuit, i.e. bare wire. Could also be a bad pin. Circuit open should mean it can not complete and causes failure in the injector cycle. With a new sensor everything points to a bad wire or connection further upstream. Resistance is the best way to determine.
Good luck and God Bless
Eagleinms
Good luck and God Bless
Eagleinms
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From: Laurel, MS
Possible causes: 1) sensor connector is damaged or open, 2) sensor circuit damaged or shorted, 3) sensor is damaged or failed(probably not if you have installed a new 1), 4) PCM has failed(probably not if intermittent)
I would check the harness plug to the sensor. It may be failing due to moisture(you said it happens when it rains). Look for signs of rust or corrodsion. Is the connection tight, does it snap together? I think the FICM gets a read from the CMP also, I'm looking for the link. If so, there may be a voltage problem. I have had this code when I had a bad C3 connection at the FICM. Chasing shorts/circuit failure is not any fun but I think a short is gonna be the cause. As soon as I find the link to the FICM I will post.
God Bless
Eagleinms
I would check the harness plug to the sensor. It may be failing due to moisture(you said it happens when it rains). Look for signs of rust or corrodsion. Is the connection tight, does it snap together? I think the FICM gets a read from the CMP also, I'm looking for the link. If so, there may be a voltage problem. I have had this code when I had a bad C3 connection at the FICM. Chasing shorts/circuit failure is not any fun but I think a short is gonna be the cause. As soon as I find the link to the FICM I will post.
God Bless
Eagleinms
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I cleaned the connector with a pick and electrical component cleaner. Snaps together and doesn't wiggle loose or anything. I am gunna check resistance when I get off work, hopefully that yeilds some results. It is bad for my mileage because Everytime it bucks, if you mash the skinny peddle it clears out and runs like the champ a 6.0 is. And thank you for all your help so far.
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From: Laurel, MS
Crash,
Go to the tech folder, scroll down to the 6.0 bible. You can download the full manuel (as I did) or pick the wiring page and open it. There is a schematic for single and dual alternators. The PCM will have the pin # printed on the outside (I think) and you will need a magnifying glass to read them. Once you find pins 31 & 43 test the ohms with the sensor still plugged. I have a 6.0 performance book that says you should see 800-1,00 ohms of resistance. If the reading is in the range, disconnect C3 at the FICM(BACK PLUG). Check VDC at pin 10 to ground with KOEO. If any VDC, you have a short to voltage. Will need to find and repair. I will stop here because you will probably run out of time and me out of room. Will check back tonight. GOOD LUCK AND GOD BLESS
Eagleinms
Go to the tech folder, scroll down to the 6.0 bible. You can download the full manuel (as I did) or pick the wiring page and open it. There is a schematic for single and dual alternators. The PCM will have the pin # printed on the outside (I think) and you will need a magnifying glass to read them. Once you find pins 31 & 43 test the ohms with the sensor still plugged. I have a 6.0 performance book that says you should see 800-1,00 ohms of resistance. If the reading is in the range, disconnect C3 at the FICM(BACK PLUG). Check VDC at pin 10 to ground with KOEO. If any VDC, you have a short to voltage. Will need to find and repair. I will stop here because you will probably run out of time and me out of room. Will check back tonight. GOOD LUCK AND GOD BLESS
Eagleinms
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