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2008 jeep wrangler 3.8 p0340 cam code
- mohammed99metallica
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5 years 4 weeks ago #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
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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- Andy.MacFadyen
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5 years 4 weeks ago - 5 years 4 weeks ago #27958
by Andy.MacFadyen
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Last edit: 5 years 4 weeks ago by Andy.MacFadyen.
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- mohammed99metallica
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5 years 4 weeks ago #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.
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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5 years 4 weeks ago #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.
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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- mohammed99metallica
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5 years 4 weeks ago #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.
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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- Andy.MacFadyen
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5 years 4 weeks ago #27965
by Andy.MacFadyen
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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- cheryl hartkorn
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5 years 4 weeks ago #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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- ScannerDanner
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5 years 4 weeks ago #27974
by ScannerDanner
But definitely check the harness very close too.
Don't be a parts changer!
Replied by ScannerDanner on topic 2008 jeep wrangler 3.8 p0340 cam code
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.cheryl hartkorn wrote: could just be cheap aftermarket junk sensors. id buy one from the dealer if it were me
But definitely check the harness very close too.
Don't be a parts changer!
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