M50B25NV off after connect ground to dme

[toybro]

Hi, I have a problem. My previous dme burned (402). I bought a new (405), unfortunately after putting the ground on the controller cover, the motor relay cuts off the current. I replaced the alternator, battery, and shaft position sensor. What could be wrong here?

[spyderg0d]

The dme is bad or you have a short going through the dme.

[toybro]

I have a 3 dme, burned 402, working 403, and working 405, any works in e34 my friend, this problem got after i rubbed a lambda cable
I rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cable

[spyderg0d]

And it shorted a resistor in the dme shared casing grounds when you "rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cableI rubbed the cable" ..the dme, Its bad its bad its bad its bad its bad its bad its bad its bad dme.

[toybro]

Sorry for my windows, that copy any text. Resistor in 402, or in all dme ? What resistor is shorted ? the main relay ? engine off symptoms appear the same on every dme.

[spyderg0d]

The dme, all of them, run shared common grounda through a circuit in the dme. When a dme goes bad in this ground circuit it doesnt allow the engine or dme relay to activate because the power is sent elswhere via the short. Most dme go bad this way either induced by water, carrosion, or other means. By the sounds of it you have an existing electrical problem that caused the original dme to fail. Then either fry the second dme also or shorts out through the dme preventing it from working.
You can either try another dme again, or do the exhaustingly extensive search for your short or missing ground.

[Eric93se]

You have to start digging and find the bad wiring.

[toybro]

all engine cable harness removed, no signs of burning / chafing. All grounds connected to the cab, main new engine ground cable. I use the burned 402 dme to search a problem. Car without rust

[spyderg0d]

You have to trace the ground wires in the harness. And make sure none are grounding that shouldnt be.

[toybro]

Even if I add additional grounding, it doesn't work. And as for lambda, should the screen be connected to ground?

[spyderg0d]

Additional grounding for what? The dme?
The 02 sensor is not supposed to be grounding externally.

[toybro]

Yes, i add the extra ground from engine to 28pin in dme.
And i connect screen of lambda to ground in lambdacable
How much omhs must have good ground from any pins from dme?
Between the controller cover and the motor block, the voltage is 0.3V, so it comes out short-circuited

There is film whats wrong, brown cable is ground: https://photos.app.g o o .gl/N89NMbjbvdZdVJR28 < delete space

[spyderg0d]

I dont understand everything your trying to say.
But we know there is a short between the block and the dme. I would next check to see if the short is present with the key in different positions. If the short is when the car is just on accessory, run, or start. This would eliminate alot of potential circuits. Also. If you unplug the battery, then unplug the engine harness, then check for the short circuit, it would eliminate the harness or the car harness as the fault.

[toybro]

on all position of key. I unplug chasis harness but short is still. Now I will disconnect each engine harness plug in turn

[spyderg0d]

Good. Reportback with findings.

[toybro]

I found problem. TPS not have any omhs on every position. After disconnect her, engines works perfectly

[spyderg0d]

Good. Happy to of helped.

[toybro]

Not good, the car is still going out. The new tps does not short circuit. The 405 driver works fine on e34, but on another e36 it does the same

[toybro]

I think about these injectors, if one has burned, maybe something in their bundle is burned, although I'm not sure.
Today i disconnect lpg installation, and nothing. I attach new engine harness, and nothing, I will buy a new starter tomorrow and write what is going on