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My X3 with N55 comes to the end of CPO warranty, so I decided to run Velvtronic test to check the condition (wife drives it so I am not sure if Velvtronic is used in full range).
First ran "Open global VTC limit position adaptation (ABL-DIT-AS1214_TVD_VVAL_RDDP)" - this thing finds lower point of resistance on the camshaft. Takes a few seconds, simple message "Limit positions successfully learnt.". You can hear it hit the limit quite clear (engine was off).
Thought it was not enough and next did "Valvetronic servomotor (ABL-DIT-T1214_TVD_VVMO2)" - this one makes you to start the engine, waits till catalytic is up to the temp, then starts moving Vavltronic in the full range every few seconds. Very clear sound on the move , and when it gets to min position engine almost chokes. Then it slowly moves the range. Mine was from 29° to 183° on the shaft. Hope it is normal. All takes about 3-4 minutes.
No faults after that, ECU is clean. I think I am in a good stand.
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