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Jayne1 · 10-15-2022, 04:42 AM

so its a forest river f53 with 6.8l v10 3v triton.

the fault is cam sensor p0340 as soon as it started.

already had new ecu fitted and sensor, wiring also checked.

any ideas on common problems?

any diagrams would be a help.

thanks

craigd853 · 10-15-2022, 06:42 AM

Quote:

Originally Posted by Jayne1

so its a forest river f53 with 6.8l v10 3v triton.

the fault is cam sensor p0340 as soon as it started.

already had new ecu fitted and sensor, wiring also checked.

any ideas on common problems?

any diagrams would be a help.

thanks

Hello, sorry to hear you are having issues. If you have changed the ECU and the sensor there are only a couple of other things it could be. My guess is to first ask how they checked the wiring to begin with, was it ohmed out with a volt meter to check for faulty wiring? The other is the pickup for the sensor could have moved and the cam sensor is not reading the cam timing correctly also there could be a bad grounding wire causing the light to come on. You don't say if you are having actual timing issues when the light comes on or not. Are you? If not then this could answer other questions and this could help narrow down the issue. Good luck and let us know.

winnbrave1 · 10-15-2022, 08:51 AM

Have experienced the same code and its problems. The crankshaft sensor works with the camshaft sensor in order to determine TDC, injector firing, and spark delivery. The reluctor ring that it uses as a trigger may be bad or the keyway damaged. You may want to have that looked at, or change it.
Have you experienced loss of power, loss of top speed, or starting issues?
Mine was a "nightmare" issue as my engine somehow jumped timing. All new gears, chains, etc., cured min. it runs like a new one.
Don't know where you are located, but World Ford in Pensacola florida has a mechanic that figured mine out.
If you have no connector issues, short issues with the sensor wires, cps is known good, pins are not bent at the ecu connector, its getting sensor voltage and signal voltage you may have deeper problems.
How many miles on your coach?

Jayne1 · 11-02-2022, 08:39 AM

We have found the issue.

The pickup pin on the cam has bent and the sensor can no longer pick up and create a signal.

we got an endoscope and placed it inside the cam sensor hole.

we just had no idea how its happened.

Arch Hoagland · 11-02-2022, 10:11 AM

Thanks for the update, glad to hear you found the problem!

winnbrave1 · 11-02-2022, 07:55 PM

Wow looks like the timing chain tentioner came loose, and the timimg chain jumped off the sprocket and bent the pick up.

KingKid · 11-03-2022, 12:49 AM

I don't like to have problem, but I am so glad that when they do happen, and when you find the problem, what a relieve.

winnbrave1 · 11-03-2022, 03:14 PM

You are so right KingKid.
The problem shown in the picture just did not happen in my book. Something came loose, or something was placed in the engine oil fill duct, i.e. may be a dip stick or something else. Regardless, on a motor coach, not an easy fix, or cheap.

Flentz56 · 12-22-2022, 05:15 PM

The chain tension slack is taken up by oil pressure, depending on how many miles are on the engine it’s possible you may have solved a symptom of another problem.