Crankshaft sensor code PO339

STRUJA98

MEMBER
2007 VOLVO S40
2.4L
5 CYL
2WD
AUTOMATIC
127,000 MILES

I keep getting the code PO339 which is bad crankshaft sensor. So far I replaced the old one with one brand new and two used ones and still have same issue. The crankshaft bracket was also damaged and I replaced it as well. It is two wire sensor and I have checked the ground for continuity. It was okay.
The engine will start and idle for about thirty seconds and all of the sudden stall. When I attempt to start it again, most of the time it will start right away. Sometimes it will hesitate and not start until second or third try. I also tried to warm up engine and it will behave the same. Do you have any idea what could be the cause of this? I am thinking perhaps to replace connector next, because that was the only thing I did not replace so far. Please let me know what you think.

7 Replies

HARRY P

MECHANIC
2,293 POSTS

You have checked the ground, but what about the lead? I would look for (1) continuity through the wire, end to end, and (2) a short by looking for continuity between the lead and the negative battery post (any continuity there indicates a shorted wire).

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Wednesday, February 14th, 2018 AT 6:56 PM

STRUJA98

MEMBER
4 POSTS

I will try to do that tomorrow. That was the only thing left that I have not replaced yet. Thanks for the help. I will keep you posted.

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Wednesday, February 14th, 2018 AT 7:01 PM

JIS001

MECHANIC
3,408 POSTS

Just to jump in here. When you have your scan tool connected, when you crank the engine do you see an rpm signal? If you do not then you will need a lab scope so you can graph the sensor.

You should also remove the sensor and have and assistant turn the engine over by hand and inspect the carrier plate for damage. Also using a pry bar, check for play on the crank shaft by putting light up and down force at the harmonic balancer and push in and out on it to make sure there is no play.

Last you will need to have the cam and crank locking tool to lock the cams and crank in place so you can verify that the timing belt is installed correctly. If all that is good, and you have a good wave form, inspect the connections at the ECM.

The lock for the ECM at the air cleaner is very delicate and breaks/jumps easily. Make sure connections are properly secured and lock and that no pins are damage. If all is good I strongly recommend you buy the bracket and sensor from the dealer. If okay and harness is good then the ECM is bad and that requires programming.

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Wednesday, February 14th, 2018 AT 8:49 PM