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Old April 20th, 2013, 16:51   #9
DanG144
Veteran Member
 
Join Date: Aug 2007
Location: Chapin, South Carolina, USA
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After the engine cools, log a start attempt, please.

The following values are for interpreting MVB005 field 3. They are actually for a BEW PD, but a good working assumption is that they are the same for your BHW.

000
Basic initialization
001
Counter reset
002
Engine switched off or malfunction
003
Transitional states
004
Plausibility check phase
005
Plausibility check phase
006
Plausibility check phase
008
Plausibility check phase
016
Phase verification
032
Synchronization phase
033
System positioning
048
Calculation sequences activated
064
System waiting for engine stop
128
Dynamic plausibility check

I think that your engine is possibly seeing a difference in the crank and cam sensor, or is getting a bad signal from the crank sensor when hot.

A BEW cannot run without a crank sensor (on only the cam sensor), A BRM can. The BEW and the BRM can both run without the cam sensor. I have no idea about your BHW.

Note your MVB 004 field 4 value when hot running, just before shutdown, does it go to 0.0? If it does, that may indicate that the ECU is substituting a value in for the cam-crank difference - it does this when the sensors are not agreeing.

Try unplugging the cam sensor when trying the hot start. Log MVB 005.

Plug in the cam sensor, unplug the crank sensor when trying the hot start. Log MVB 005.

When the engine is cold do the same things, capturing the logs.

If you alter the name of the file (put hot no cam after the number but before the .csv) before you start logging it, then you can keep your data straight by using the different files.

I have seen several hot failures of the crank sensors, and they throw no codes. Not sure why. But I have added crank sensor failure to my list of "no code no start" potential problem list.
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