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Old 08-11-2019, 07:03 PM
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p0344....save me from the shop

2005 rubicon LJ with Eaton m90 supercharger. One year ago p0016 and maybe another 300 series code popped up. Replaced OPDA and cam sensor as the jeep was up there in miles anyway. Code and limp mode fixed.


fast forward to present day, I cant shake this p0344 code and limp mode. Weekends trouble shooting:
  • 4.9V to cam sensor
  • continuity in cam sensor ground through PCM
  • cam sensor signal output around 2V (micrometer only, not scoped)
  • continuity from cam sensor signal to PCM
  • continuity from cam sensor signal through secondary ECU (for fueling)
  • continuity in ground circuit from PCM to vehicle speed sensor
  • continuity in 5V power from PCM to vehicle speed sensor
  • visually inspected cam sensor harness, no apparent shorts in cam signal wire or 5V source wire.
  • shake test with harness and multimeter for previously listed (trying to find short or open)
  • verified cam sensor sync
  • aftermarket or OEM cam sensor does not make a difference
  • all continuity tests were with the sound setting. Solid even tone was generated for all
  • code tripped under light load, 120*F coolant temp.
Any ideas? I haven't checked the crank sensor, but only the ground circuit seems to go through that sensor and ground checks out. Open to suggestions as I don't know what else to do at this point. Jeep is two hours away so every time I go to troubleshoot its an event.



Thanks!

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Old 08-12-2019, 12:01 PM   #2
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The aftermarket cam sensors are definitely problematic & for some time the ones from the dealers are no better. The only ones that do not normally seem to have problems with the P-0340 &/or P-0344 codes are the original ones that originally came on the original OPDAs.

One of the suspected reasons is the apparent substandard specs of the now available sensors. Another possible (& related to the first) is the significant variation in the air gap (distance) between the sensor face & the tone wheel of the replacement OPDA. Even the best of “hall effect” sensors are very sensitive to the distance from them & the object that trips them.

There was some testing that indicated both the differences in the sensor outputs & the air gap variations of aftermarket OPDAs done by a guy & posted on at least one site.

If you search the P-0344 code on this & other TJ sites you will find a lot of postings, with no real solutions if you no longer have an original sensor.

One possible solution besides trying “new” sensors until you get one that works is to try shimming the sensor to change the gap. That has had some success but not a definitive solution.

Since you went a long time before getting the code you should check the OPDA to see if there is lateral movement in the tone wheel/shaft that may be causing the wheel to be further from the sensor than before or maybe closer or even rubbing on the sensor. If the OPDA bushings are worn that could be the cause.

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Old 08-12-2019, 06:25 PM
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Originally Posted by RUBI 4 MY MRS View Post
Since you went a long time before getting the code you should check the OPDA to see if there is lateral movement in the tone wheel/shaft that may be causing the wheel to be further from the sensor than before or maybe closer or even rubbing on the sensor. If the OPDA bushings are worn that could be the cause.

I will check for play. Thanks for the insight. Both original cam sensor and aftermarket sensor are tripping the code, but if the replacement OPDA is toast then it wouldnt matter.
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Old 08-12-2019, 06:42 PM   #4
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Of course an original cam sensor can fail but the ones used in the ’05 & ‘06 4.0s seem to rarely fail. Some have been replaced thinking they were bad only to find the problem persisted indicating that was not the problem. If your OEM sensor is, in fact, original that is encouraging & hopefully you find another reason for the P-0344 code. It is also odd to get the exact same code with 2 different sensors & often points to a different source of the problem.

Keep us posted on your findings as this is an ongoing problem & anything that points to a solution is welcome.
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Old 08-13-2019, 05:49 PM
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Keep us posted on your findings as this is an ongoing problem & anything that points to a solution is welcome.

Turns out im spending next week with the jeep so i will do some more troubleshooting.

I agree that the same code with two different sensors points to another cause. That is why i spent the time chasing for a weird short/open with no luck. I have till friday to brainstorm and ill hit it again over the weekend.
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