Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
The humming is normal as is the initial clicking, that is throttle body and normal behavior.
Since changing the two sensors did the codes change at all?
Can you reinstall the original cam sensor and clear the code again (aftermarket cam sensors almost never work on these trucks)?
With it cleared let's crank it again extensively and see if it our a different fault comes on.
In the mean time, were any bolts or nuts etc lost during the valve cover job?
Let's check the wiring right off the cam sensor... Nothing for stretched or pinched right?
The engine was running fine prior to this all taking place though right?
Please take the oil cap off and have a helper crank the engine while you watch in the oil fill hole. Can you see the rocker arms moving?
Please unplug the cam sensor and measure the voltage between battery negative and each pin of the sensor connector with the key on. Let me know what you find.
Please plug the cam sensor back in and back probe the 5v wire.
in this state use a 22mm socket on the crank bolt and rotate the engine clock wise (do not use the starter). What behavior do you see from the 5v wire?
The 5v does not change?
Where are you hearing this noise?
Thanks... This is definitely a concern. Let's pull that valve cover back off and make sure the entire cam is turning.
Thanks. The hissing is just compression that is okay.
As strange as it would be to have a sensor just fail while doing this job, it appears that is the case.
We verified the source 12V and reference 5V are both present, yet rotating the anti new shows no on/off pulse from the 5V line. We verified upper engine movement and no problem with the cam preventing the cam reluctor from turning.
That only leaves the sensor itself to be at fault for no signal out of that 5V wire.
Get a new genuine Mitsubishi sensor on there and you should be good to go. No exceptions here with the source of the sensor... If it isn't purchased directly from a dealership, it is not trustworthy on this model. The cheap Chinese sensors the auto parts stores sell (including the ones places like O'Reilly sell and swear they are real) do not work.
As far as I can see that's all you should need. Your 12V and 5V signals are there but they're is no change on the 5V wire while the engine turns and you confirmed the upper engine is turning, cam is rotating all the way across. That only leaves the sensor itself.
That will take care of your p0340 issue... Once that is resolved your fuel and spark etc will go back to normal.
Yes, both the cam and crank sensor 5V signals will pulse on and off as the engine is rotated by hand. This is with the sensor plugged in and the 5V wire back probed just like we did with the cam sensor.
Not sporadic at all... When rotating by hand it is very clearly defined 0v-5v-0v-5v.
Please re-check your cam sensor signal... do you still have no pulse, or do you have 5-0-5-0 behavior now?If you still have no pulse, then you need to recheck there is rotation at the cam sensor... perhaps take the sensor out and watch in the hole for movement.
If there is pulse now, then we corrected that issue but there is still something else in play we need to work on.