B9 , Exhaust camshaft Vanos position control - BMW M5 Forum and M6 Forums
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post #1 of 68 Old 26th October 2016, 11:28 PM Thread Starter
vallibirgiss
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B9 , Exhaust camshaft Vanos position control

I got the B9 Exhaust camshaft vanos position control code

So far i replaced the exhaust cps , switch sides to confirm it's working and it is

Checked the vanos solenoids and board , also confirm that it's not that by switching sides

Any ideas?
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post #2 of 68 Old 27th October 2016, 10:06 AM
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Check the wiring from the sensor to DME?

"Keep things as simple as possible...But no simpler"
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post #3 of 68 Old 27th October 2016, 12:32 PM Thread Starter
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post #4 of 68 Old 27th October 2016, 06:23 PM
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post #5 of 68 Old 27th October 2016, 08:05 PM Thread Starter
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No changed both exhaust , no change still error on bank 1 , so i switched cps to see if code would move from bank 1 to bank 2 but no luck still bank 1
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post #6 of 68 Old 28th October 2016, 01:13 AM Thread Starter
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post #7 of 68 Old 28th October 2016, 06:01 AM
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You don't want to test the sensor itself since it's new, you want to test the circuit with the sensor plugged in. Use wire-piercing probes, put the voltmeter on AC volts. Pull out the fuel pump relay so the car doesn't start. Have someone crank the engine while you watch the meter. You should see about 1 volt.
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post #8 of 68 Old 29th October 2016, 08:59 AM
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When you get position control alone it is usually a failed diode on the board. The solenoids will still work but the diode will not be absorbing the produced electricity so the solenoid does not close exactly when it should. If all your diodes are fine then it is likely a leaking solenoid. Sometimes they leak for mechanical failure and all the cleaning in the world will not help, you just have to replace it. Dis vanos test will point you to the correct cause.
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post #9 of 68 Old 8th November 2016, 08:49 PM Thread Starter
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Still no solution , checked the wiring everything seems good

Sailor24 , yes i understand but shoulndt the error code switch from bank 1 to 2 if i switched the boards?

I'm starting to think that i may be some vanos piston issues / timing ?
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post #10 of 68 Old 9th November 2016, 10:38 AM
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My bad. I re read your first post and got it wrong the first time.You replaced a CPS and switched it side for. Then you swapped the boards side for? Through all this the code has remained the same? You have cleared the codes in between? I assume yes.
Could be hydraulic but finish checking the wiring first. There is this strange ground fault, it is located in the injector wire housing, but you need not go there just jump a wire to the grounds of the boards. A temp wire with a couple of alligator clips. Find a good/easy bolt and clip there then to the ground wire on the board. If no change then think hydraulic.
If it is hydraulic with that code it would be piston seals failed, unusual but there is a kit for it. Many posts on the system, I have no experience with it. In all the cars I have seen I have never seen anything but board failure.
If you want to read about the failure. It was first posted by one of the Aussies put vinegar in your search as this is how he cleaned it. Sorry don't remember who but the Aussies like to start their names with M5.

Last edited by Sailor24; 9th November 2016 at 10:51 AM.
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