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2008 jeep wrangler 3.8 p0340 cam code

  • mohammed99metallica
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20 Mar 2019 12:42 #27957 by mohammed99metallica
2008 jeep wrangler 3.8 p0340 cam code was created by mohammed99metallica
Main complaints the cam sensor has been changed 3 times
It runs about 70 km then it fails again
The problem in the sensor it self
Could it be a short in the wiring causing the sensor to fail and not hurting the pcm?!
Please help
Thanks for your kindness

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20 Mar 2019 13:55 - 20 Mar 2019 14:04 #27958 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic 2008 jeep wrangler 3.8 p0340 cam code
I think I would try looking for a wiring fault --- open, short, bad power or ground, green corrosion. Every time the senors is changed the wiring and connectors get disturbed. It goes without saying use manufacturers parts.

"There's always a catch ---- Catch OBD2 ."


Last edit: 20 Mar 2019 14:04 by Andy.MacFadyen.

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20 Mar 2019 14:21 #27959 by mohammed99metallica
Replied by mohammed99metallica on topic 2008 jeep wrangler 3.8 p0340 cam code
I did the tests..
5 volts still steady while cranking or running and with ignition on.
Ground less than 0.100 volts while running.
0.2 volts while cranking.
Signal 4.7 to 4.8 still at all time while ignition on and running.
When I disconnet the sensor I have A 5 volt bias signal.
That's why I'm condemning the sensor it self.
But it's been changed 3 times!
Running with a new sensor and not doing the relearn procedure would cause the new sensor to fail?! I'm so confused about this vehicle.

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20 Mar 2019 15:41 #27962 by guafa
Replied by guafa on topic 2008 jeep wrangler 3.8 p0340 cam code
Have you checked ground or power noise with scope?

Transient spark can burn semiconductors. A single spark with a voltage higher than 5volts is enough.

A non separated sensor ground, a bad main ground, sensor wires near to plug wires can cause transient sparks.

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20 Mar 2019 15:55 #27964 by mohammed99metallica
Replied by mohammed99metallica on topic 2008 jeep wrangler 3.8 p0340 cam code
No I didn't.. No scope available this time.
I have only an analog Tektronix 465B with DM44.
I'll try my best with it.
Thanks for your help brother.

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20 Mar 2019 16:18 #27965 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic 2008 jeep wrangler 3.8 p0340 cam code
It is a circuit fault code that can only mean sensor or wiring or engine computer


"There's always a catch ---- Catch OBD2 ."


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20 Mar 2019 20:20 #27967 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2008 jeep wrangler 3.8 p0340 cam code
could just be cheap aftermarket junk sensors. id buy one from the dealer if it were me
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21 Mar 2019 07:28 #27974 by ScannerDanner
Replied by ScannerDanner on topic 2008 jeep wrangler 3.8 p0340 cam code

cheryl hartkorn wrote: could just be cheap aftermarket junk sensors. id buy one from the dealer if it were me

I agree with cheryl here my friend, if a new sensor is fixing it for 70 miles or so and you are sure the wiring is not damaged and intermittently touching ground somewhere, you may just simply be getting junk parts. The video Andy posted in this thread, that is exactly what my issue was, a bad "new" part.
But definitely check the harness very close too.

Don't be a parts changer!
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