E32 750iL Electrical Problems Need Help

[shogun]

Just try another MAF and see what happens. We found on several cars the cables broken from e-box to MAF just before the MAF, the outer cable sheath is hard like stone and when it breaks it cuts into the wires inside the loom. Also the cable loom plug breaks internally.
You can test the MAFs
http://bmwe32.masscom.net/sean750/MA...leshooting.htm
http://www.ow.no/index.php?option=co...d=19&Itemid=13
EML modules are also getting old and I have read about some cases when only one side was running, so if you have a chance and can test another EML module, that would help

[Morkare]

Shogun,

maybe you might have the pinout for the EML connector, I wanna check to see if the connector for the EML is putting the correct voltage for the side thats not working. Unless there's a way to test the EML specifically. I wanna ensure this is an EML issue or maybe a connection issue with the wiring? Maybe if you think it could be that if not the MAF when I check this weekend.

[shogun]

E32 M30 and 750 EML module pinout I posted here https://www.bimmerforums.com/forum/s...frence-pin-out
Pin 1 EML Pedalwertgeber
Pin 2 EML Pedalwertgeber
Pin 3 frei
Pin 4 ABS/ASC/ASC+T Steuergerät
Pin 5 DME Steuergerät 1
Pin 6 EML Pedalwertgeber / DME Steuergerät 1
Pin 7 EML Pedalwertgeber
Pin 8 Instrumentenkombi
Pin 9 EML Pedalwertgeber
Pin 10 EML Stellmotor 2
Pin 11 EML Stellmotor 2
Pin 12 EML Stellmotor 1
Pin 13 RXD Datenleitung
Pin 14 Masse
Pin 15 EML Leuchte Instrumentenkombi
Pin 16 EML Stellmotor 2
Pin 17 EML Stellmotor 1
Pin 18 Hauptrelais 2
Pin 19 Masse
Pin 20 EGS Steuergerät
Pin 21 frei
Pin 22 Steuergerät ABS/ASC/ASC+T
Pin 23 Steuergerät ABS/ASC/ASC+T
Pin 24 frei
Pin 25 frei
Pin 26 EML Stellmotor 1
Pin 27 EML Stellmotor 1
Pin 28 EML Stellmotor 2
Pin 29 frei
Pin 30 Masse
Pin 31 Kühlwassertemperaturfühler
Pin 32 EML Pedalwertgeber/DME Steuergerät 2
Pin 33 DME Steuergerät 2
Pin 34 EML Stellmotor 2
Pin 35 EML Stellmotor 1
Pin 36 Hauptrelais 2
Pin 37 Hauptrelais 2
Pin 38 EML Stellmotor 1
Pin 39 frei
Pin 40 EML Stellmotor 2
Pin 41 Klimaanlagenrelais
Pin 42 Getriebewählschalter
Pin 43 Schalter Geschwindigkeitsregelung
Pin 44 Steuergerät Lock Sensor
Pin 45 Kühlwassertemperaturfühler
Pin 46 EML Pedalwertgeber
Pin 47 DME Steuergerät 1
Pin 48 frei
Pin 49 DME Steuergerät 1
Pin 50 DME Steuergerät 2
Pin 51 frei
Pin 52 EGS Steuergerät
Pin 53 ABS/ASC/ASC+T Steuergerät
Pin 54 frei
Pin 55 TXD Datenleitung


should be also in the ETM https://shark.armchair.mb.ca/~dave/BMW/e32/
and the Bentley repair manual has it in detail
1988 750 DME pinout here https://www.europeantransmission.com...out1988_90.pdf

[Morkare]

Shogun,

we might be onto something here. I'm not sure what this would tell you but, I had a spare MAF sensor. I unplugged the passenger side maf aka the side that doesn't seem to be working at all, and plugged in the MAF i got when I bought the car and now it wont start. I replugged the maf that's on the car back in and took that spare maf to the side that does work, and of course it started fine. How come when I plug in the spare maf to the side that doesn't seem to work the car doesn't start but plugging it into the side that "does work" it starts fine?

[shogun]

The MAF on passenger side is in charge for bank 2 = cylinders 7-12, and the MAF on driver side works for bank 1 = cylinders 1-6.
Even with MAF disconnected the engine should start, if there are unplausible values for the DME, it would take default values.
It will not start without Crankshaft Position Sensor signal.
I assume with all the electric repairs you did as mentioned in the first post, something went wrong, very difficult to check, needs time and double checking with the ETM.