05 XC90 T6 changed Timing Belt now Camshaft Positions High

HereInOhio · Post by **HereInOhio** » 20 Apr 2015, 10:36

I recently changed my timing belt. I lined up all the marks and also marked the old belt and transferred the marks to the new belt to ensure everything lined up the same.

It starts and runs very smoothly but I'm getting fault codes for ECM-670C camshaft position, inlet high and ECM-671C camshaft position, exhaust high.

When started after sitting over night it revs high and low initially but after about 30 seconds it smooths out. If it's warm it starts and runs fine with no fluctuation in the rpm.

Any ideas? Vida said to check if it's greater or less than 8 degrees once warm to see if the problem is intermediate but I can't find where that info would be in vida.

HereInOhio · Post by **HereInOhio** » 21 Apr 2015, 10:50

Well from more research it would lead me to believe that the timing belt is off a tooth but I am 99.9% sure it was installed correctly (the risk of having it wrong was pretty high at trashing my engine). That being said I also read that the VVT system my need aligned but I didn't remove any of those components besides the timing belt.

With the intake and exhaust both having high fault codes does that signify anything like both cams are good but the crank is off a tooth? If that was the case would one be high and one low?

Would anyone know how to check the cam position with vida/Dice?

Post by **JDS60R** » 21 Apr 2015, 13:16

DICE

It in communication with the ECM. Parameters will show cam position. Greater that 7 degrees off the mark generates a code. You will need to reset the belt correctly. Remember your VVT hubs are on correct ( as you didn't take them off). You just put them in the wrong position. Run the cams 90 degrees rotation past their marks ( crank 180 past) and then return crank backwards to its mark. Look up at the cams and you will see how far off you are and which way.

1 hour job
Best wishes,
John

I'm not sure where my head was yesterday. When you get the crank in the correct position you will want to lock the cam and then set the cam pulley position correctly. I left out the locking the cams part yesterday. Sorry

Post by **JDS60R** » 23 Apr 2015, 16:42

Answering PM on if 05 is different procedure

Nope,
Its exactly the same.

Lock up the cams ( or make sure they are dead flat -parallel to the sealing line) . You may not be able to as you will likely hit the limit of the VVT while trying to go flat. (if you have the cam lock use it - if not -get a helper - pass the cam marks by 90 degrees then turn back. Make sure crank is lined up. remove what is needed to see other end of cams ( helper side) . Remove T belt without disturbing crank marks aligning. Have helper bring cams to flat lock position (carefully do not break the cam -use a flat piece of metal that slides in until it hits the cam - then turn that piece of metal to turn the cam.)

While cams are flat - you turn the cam pulley to its marks. ( you never loosen anything on the cams as - per you -it has not been moved from factory setting) .
Then - put the belt on and set tensioner properly.

Then 2 full turns by hand only from the crank to assure no problems. Button it up , clear codes and test .