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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 02-08-2013, 04:01 PM
Diesel Power Diesel Power is offline
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Mein Auto: 335d
Question No start problem

After two weeks at the BMW dealer, my intermittent no start problem was fixed. Turned out to be the BUS line between the DDE and CAS module. It all started with the vehicle not starting within 30 seconds of turning off after a 45 minute drive (crank only). The car on the service hoist pic and fuel error message displayed on the Nav screen. It started a short time later and happened again about a week later 90 seconds after turning the vehicle off. The dealer installed a fuel pressure gauge to the low side and drove the car for a few days trying to duplicate the no start, which was successful. There was no pressure at the low side and the fuel pump was not being activated. BMWNA instructed the dealer to replace the CAS module but that didn't resolve the problem. BMWNA instructed the dealer to drain the fuel tank and remove the low pressure pump for a corrosion inspection. Since there was no presence of corrosion, BMWNA instructed the dealer to sample the fuel for contamination (none present). Removal of the high pressure rail sensor was next ( no corrosion). BMWNA was insistent the problem was fuel related. Fortunately, the technician finally convinced them otherwise. Turns out there was no BUS line in Pin 36 of the DDE connector via schematic (uncertain if missing). Dash removal was required to inspect the body harness splice point, which revealed an open circuit. Technician ran a new dedicated BUS line between the DDE and CAS module, which resolved the problem. Kudos to Joe, the BMW technician for resolving this problem despite the lack of assistance from BMWNA (fixated on fuel issue).
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Old 02-08-2013, 04:12 PM
GreekboyD GreekboyD is offline
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Wow. Talk about a headache man.
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Old 02-11-2013, 03:33 AM
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Axel61 Axel61 is offline
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Kudos to the TECHIE otherwise youd be driving a loaner today!!!!
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Old 02-11-2013, 12:29 PM
TDIwyse TDIwyse is offline
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Quote:
Originally Posted by Diesel Power View Post
Kudos to Joe, the BMW technician for resolving this problem despite the lack of assistance from BMWNA (fixated on fuel issue).
Wow! What a great technician and tremendous problem solving! Thanks for posting that.
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Old 02-11-2013, 01:34 PM
BMWTurboDzl BMWTurboDzl is online now
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Great job by the technician!!!
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Old 02-11-2013, 01:53 PM
Snipe656 Snipe656 is offline
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I just hope that does not lead to some annoying dash rattles. Seems to be an often downside to when they need to be removed and put back in.
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Old 02-12-2013, 03:02 AM
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Axel61 Axel61 is offline
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DIESEL Power send BMWoA a letter as to what transpired and make sure you mention the TECHIEs name We need guys like this with COJONES to challenge the big boys
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