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Old 08-24-2013, 07:57 AM   #1
kartracing6
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Default P0340 after jdm wrx swap (camshaft position sensor) any ideas??

So a few weeks ago I spun a bearing on my 2002 wrx wagon. I swapped in a jdm ej20 longblock without avcs. I'm still running the canadian ecu on it. I tried to start it but nothing happened. After a bit of research, I figured out I had to switch the crankshaft gear and use the one that was on my old engine.

After that it started right up but the engine barely runs and the idle is incredibly shaky and I got p0340 cel (camshaft sensor). I then changed said sensor with the one from my old engine which I know works but it didn't even start. I triple checked the timing and it appears to be correct. If changing the sensor doesn't work does anyone have any idea what could cause this? Since the crankshaft gear was different, could the camshaft gear also be different?

Any help would be greatly appreciated, thanks!
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Last edited by kartracing6; 08-24-2013 at 08:30 AM.
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Old 08-24-2013, 12:48 PM   #2
kartracing6
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problem found, the jdm cam gear is different than the usdm one for some reason...
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Old 04-08-2015, 10:14 AM   #3
Alex1221
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Hm, I've done the same swap and am experiencing the same problems. Switched the sensor and cam gear from my USDM one and the engine is still shaky and barely idles. Could I have the timing wrong? I used the little notch to time the engine not the arrow. Not sure if this is the problem?


Any help?
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Old 04-08-2015, 03:45 PM   #4
rex7tuner
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If you ever have this code thrown at you. A faulty alternator WILL cause this. Even if you take a voltmeter to the Alt and gives 14v + output. (idle, revved up a bit, Full AC on, headlights, every possible load) and still gives 14+ volts it can still cause this code. Not very knowledgeable on the small parts inside an Alternator but something inside causes it. Just for anyone still still with this PITA code.
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Old 04-08-2015, 04:38 PM   #5
wtdash
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Quote:
Originally Posted by Alex1221 View Post
Could I have the timing wrong? I used the little notch to time the engine not the arrow.
If you used the notch in the timing cover that could be the problem. My Subie tech said to NOT use those. Use only the marks on the cam gears/sprockets.
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Old 04-08-2015, 11:09 PM   #6
Alex1221
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Quote:
Originally Posted by wtdash View Post
If you used the notch in the timing cover that could be the problem. My Subie tech said to NOT use those. Use only the marks on the cam gears/sprockets.

Right, that's what I meant I used these, and my idle is extremely rough.. Roughly about 500RPM. Which is weird.

Found out one injector is out, could this be the problem to this code?
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Old 04-08-2015, 11:12 PM   #7
Alex1221
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Quote:
Originally Posted by rex7tuner View Post
If you ever have this code thrown at you. A faulty alternator WILL cause this. Even if you take a voltmeter to the Alt and gives 14v + output. (idle, revved up a bit, Full AC on, headlights, every possible load) and still gives 14+ volts it can still cause this code. Not very knowledgeable on the small parts inside an Alternator but something inside causes it. Just for anyone still still with this PITA code.
Haven't tried this out, will try and let you know.
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Old 09-26-2020, 03:55 PM   #8
MichiganMat
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ATTENTION: Subaru uses the same connector for the cam sensor as it does for the #4 fuel injector.
Both are grey 2 wire connectors, both are interchangeable.

Its unintuitive because it appears that the injector plugs & wires come out of the harness as a set, with the cam sensor as an outlier.... which is not true.
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Old 09-28-2020, 02:17 AM   #9
KP213
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Have you had any other codes thrown, or just P0340? Just curious because I’m trying to diagnose some things in my car, and have read that the camshaft position sensor could play a roll.
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