B9 , Exhaust camshaft Vanos position control - Page 11 - BMW M5 Forum and M6 Forums
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post #101 of 107 Old 1st July 2019, 04:14 AM
dvldo
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Hi Everyone, just wondering if this was ever resolved. I've read through probably all of the VANOS related thread and cannot seem to find a resolution for my car. I'm getting similar symptoms for code 72. Swaped boards, resoldered all joints, replaced diodes, replace solenoid rings, beisan rings, cleaned all ports on the VANOS unit itself, and installed new CPS (all 4). I'm still reading error 72. One thing I still have not done is swap the VANOS units. Just wondering if there is anything else I should check. Thanks. This is driving me crazy.
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post #102 of 107 Old 1st July 2019, 07:05 PM
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They have all been resolved but most are different. You no results or any change from doing the things you have done? It is a bad ground then. In the electric conduit right over the fuel rails is where the grounds for the vanos solenoids join, check that.
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post #103 of 107 Old 1st July 2019, 07:24 PM
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Thanks, Sailor. I just read that from another post last night. I will check that when I fine the time and report back. That sounds like it could be the issue. Yes, no results from everything I've done so far.
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post #104 of 107 Old 7th July 2019, 09:10 PM
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I finally had time to check the ground leads on Bank 2. Looks like there's some corrosion which I'm currently soaking in vinegar. I check the resistance on all the pins and they seem kind of odd.

Bank 2(key off):
Pin 1 is 3.8koms
Pins 2 and 5 are both reading about .8kohms,
Pin 4 is 8.5kohms and 6 is 8.6
Pin 3 is 216.9kohms??

Bank 1(key off):
Pins 2 and 5 are .5kohms
Pins 1, 3, 4, and 6 are all around 8.5

Would a bad ground cause the high resistance reading for B2/Pin 3? I checked the voltage with key on and B2/Pin 3 shows 70mV and Pin 1 58.1mV. comparing with B1, readings show 1.1mV.
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post #105 of 107 Old 7th July 2019, 09:11 PM
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post #106 of 107 Old 7th July 2019, 09:53 PM
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I traced the high resistance reading from pin 3 all the way to the DME. The high resistance reading isn't from the wiring, I think it is coming from something inside the DME box. Checked resistance from where the Pin 3 wire connects to DME (DME side) tground is the high resistance reading comes from there. Should I open up the DME and take a look or is this a sign I need to replace it? Now I'm worried.
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post #107 of 107 Old 7th July 2019, 10:27 PM
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Jumped the gun... Took a look inside the DME box and found a fried chip(BTS621L1). I guess I'll order one and have someone at work solder it in. I guess we'll see what happens.
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