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Discussion Starter · #1 ·
My question relates to camshaft timing on a 2000 V70XC. I bought the car recently with OBDII code PO014 set (B camshaft over advanced). The car has a B5244T engine with CVVT on the exhaust camshaft only. The timing marks were all aligned properly.

I spoke to a private mechanic who is a Volvo specialist who suggested that although the timing marks are aligned the camshaft may not be because the sprocket is not keyed to the shaft. If the sprocket had ever been taken off, the camshaft may be misaligned. I took the car to him and had him replace the timing belt, idlers and water pump. He said he was sure the sprocket had never been off so did not apply the camshaft lock and check the position of the timing marks with the camshafts locked.

On my way home (300 kilometers) the check engine light came on again and PO014 was reset. The Volvo mechanic recommends the next step is to change the CVVT solenoid. I disconnected the electrical connection to the CVVT solenoid thinking that if it was causing the cam to over advance, it would not do so if disconnected. Is this in fact true or would the CVVT solenoid still advance the camshaft even if electrically disconnected? Now, PO014 is reset after only a short time and, of course, with the solenoid disconnected, PO013 (camshaft position actuator circuit open) is also set.

Any suggestions of what to do next will be most welcome. What are the chances that a camshaft position sensor might be at fault?
 

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i had a problem like that after doing a camshaft seal replacement. After reinstalling the gear, when i aligned the marks, the spring loaded mechanism wasn't fully loaded so the code showed up. I had to reposition the gear and now its like new.
 

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Discussion Starter · #3 ·
Thanks Igor. I watched as my Volvo mechanic fully loaded the spring. Maybe the next step is to lock the camshaft and see if the sprocket is installed correctly. Anyone have advice on doing that in the home workshop? Igor, how did you make sure that the camshaft was properly positioned & stayed properly positioned while reinstalling and spring loading the gear?
 

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The only way to be sure the cams are properly aligned is to take the cam sensor and the rubber plug out of the rear of the cylinder head and look at the rear of the cams. If you turn the engine clockwise past the timing marks about 45 degrees and then turn it backwards so that the timing marks are aligned, the slots in the cams should be parallel to the seam in the center of the cylinder head. The slot in the intake cam should be above the seam and the slot in the exhaust cam should be below the seam. If this isn't the case it's possible that the VVT hub was installed incorrectly at some point, or your mechanic didn't align things properly when he put the new belt on. P0014 is a very common code to see when people mess up the alignment of the timing belt - Google the code and you'll see tons of forum posts about it.
 

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Also, I'm not 100% clear about what your mechanic did during the timing belt change, but it sounds like he lined up the marks before taking the belt off and then turned the VVT unit to the limit of its travel while installing the new belt. If that's what he did, the camshaft is too far advanced, hence the code. Like I mentioned above, Volvo's instructions for the timing belt replacement ask the mechanic to turn the engine a quarter turn past the marks and then turn it back so the marks line up; that action fully retards the VVT unit (which is advance-only) and negates the need to turn the cam pulley during the installation of the new belt.
 

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Discussion Starter · #7 ·
Thanks again Kampman. Within the next couple of days I will try going past the timing marks & backing up to the marks & check the slot at the rear of the exhaust camshaft as well as the timing marks. From other internet info, it looks like it is necessary to lock the camshaft in order to loosen the bolt holding the CVVT hub to the shaft since it is torqued to 88 Ft Lb. If I find it is necessary to remove the CVVT hub, is there an easy way to lock the shaft without the special tool?
 
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