Car Died While Driving - No Start Condition

[mikerunt]

here is the video link hat i believe wasnt working:

https://www.dropbox.com/scl/fi/58s38...w8somrzvx&dl=0

[amrazM]

based on that video the dme is getting power for sure, ekp is on and the actuators are moving to start. I would make sure the engine is turning, the oil temps werent very high to indicate a main bearing failure but something tells me that motor is locked. did you feel a reduction in power at any point while lapping?

[mikerunt]

Originally Posted by amrazM

based on that video the dme is getting power for sure, ekp is on and the actuators are moving to start. I would make sure the engine is turning, the oil temps werent very high to indicate a main bearing failure but something tells me that motor is locked. did you feel a reduction in power at any point while lapping?

No reduction in power at all - literally the car just died.

If the motor would have locked I feel it also would have spun me out on track.

[Helmsman]

Originally Posted by mikerunt

No reduction in power at all - literally the car just died.

If the motor would have locked I feel it also would have spun me out on track.

Just try to turn the engine around will you. Fan out, 32mm socket, there you are.

[Honda]

There is electrical issue. Starter is not even engaging.

[omgzirra_exe]

Originally Posted by Honda

There is electrical issue. Starter is not even engaging.

yeah i think the solenoid is dead.

get it tested.. if it only getting 12V it's probably donezo.

but typically that would be a CAS fuse Terminal50 ? that would indicate a bad starter.

could also be the ground strap for the fuse box in the glove box :3

[mikerunt]

You guys are all great - thank you so much for the feedback.

Will report back Friday.

[amrazM]

Originally Posted by Honda

There is electrical issue. Starter is not even engaging.

why would the car shut off? you can hear in the video the dme relay is clicking, actuators turn on, fuel pump is on etc. op needs to turn the engine by hand.

[Honda]

Originally Posted by amrazM

why would the car shut off? you can hear in the video the dme relay is clicking, actuators turn on, fuel pump is on etc. op needs to turn the engine by hand.

I don't know why car shut off but I would I assume this is different issue. The symptoms he is observing now is a problem I've also experienced before. Starter is not engaging. I don't hear solenoid getting clicked in the video he posted. This is same symptom I had before.

[mikerunt]

Something I noticed - there are no lights on my gear shifter when I turn on the car…I did have that code of gear selector no voltage or something when I scanned.

Might explore that more tonight. Cars going to the shop tomorrow.

[mikerunt]

Quick update:

• Ground straps are all fine
• Fuses and relays are all fine
• Battery at 13v
• The car starts when it’s taken out of park lock (which is why it wasn’t starting before)
• DCT harness connection checked and confirmed

The issue:

• There is no communication with the DCT. Like at all. Can’t run any system tests or anything.

What could possibly be causing the DCT to completely disappear? I don’t want to jump and assume Mechatronics just yet - looking for other electrical errors that could possibly be causing this.

One note - I did disconnect my gauge cluster to move it and hide it up behind the dash but it was reconnected BEFORE the car had this issue. After I moved the cluster the car ran fine for 5 sessions on track before the issue. I moved this cluster with the Cartek kill switch in the car completely of.

The car also has an OTB Epic tune on the engine and trans. Could the trans tune have been weird? Again, was running fine with the trans tune up until this point?

Could this be a CAS issue? DME?

[Brandoch]

Well apparently I stand corrected about engine mechanical, great news.
I hope you figure it out.

[mikerunt]

Originally Posted by Brandoch

Well apparently I stand corrected about engine mechanical, great news.
I hope you figure it out.

I take much pleasure in saying yes you were wrong!

However, could still be mechanical in terms of trans or bad Mechatronics.

[e92dud]

Originally Posted by mikerunt

I take much pleasure in saying yes you were wrong!

However, could still be mechanical in terms of trans or bad Mechatronics.

Sound like your dct trans decided to identify as a manual.

[mikerunt]

Originally Posted by e92dud

Sound like your dct trans decided to identify as a manual.

It currently is identifying as a quitter. I’d be stoked if it identified as a manual.

[mikerunt]

Bumping for any help or thoughts.

Plan is to likely drop the trans if there aren’t any other thoughts.

[mikerunt]

It seems the whole trans computer just died as I can’t talk to it through the diag computer and the engine ecu can’t communicate to it either - and the engine ECU has a direct connection to it with nothing in between. If that link was down I wouldn’t be able to talk to the engine computer. So it really seems to be internal to the trans.

any thoughts here team?

[omgzirra_exe]

Originally Posted by mikerunt

It seems the whole trans computer just died as I can’t talk to it through the diag computer and the engine ecu can’t communicate to it either - and the engine ECU has a direct connection to it with nothing in between. If that link was down I wouldn’t be able to talk to the engine computer. So it really seems to be internal to the trans.

any thoughts here team?

you're taking the DCT out and swapping in a new used one.

i bet if you did remove it and inspected your mechatronics it might have oil inside it. meaning the mechatronic seal failed.

[mikerunt]

Originally Posted by omgzirra_exe

you're taking the DCT out and swapping in a new used one.

i bet if you did remove it and inspected your mechatronics it might have oil inside it. meaning the mechatronic seal failed.

I am going to check this over the weekend:

BMW Mechatronic Sleeve
The BMW mechatronic sleeve is located on the passenger’s side of the transmission near the automatic transmission. This is where the Transmis- sion Control Unit (TCU) wire harness connects the transmission.
Unplug the wire harness and inspect for oil contamination. If there is oil, the communication between the transmission control unit and the mecha- tronic valve body is interrupted. You must get your BMW up on ramps to replace or check for leaks. Remove the splash shield from under the trans- mission and unplug the wire harness.

[omgzirra_exe]

Originally Posted by mikerunt

I am going to check this over the weekend:

BMW Mechatronic Sleeve
The BMW mechatronic sleeve is located on the passenger’s side of the transmission near the automatic transmission. This is where the Transmis- sion Control Unit (TCU) wire harness connects the transmission.
Unplug the wire harness and inspect for oil contamination. If there is oil, the communication between the transmission control unit and the mecha- tronic valve body is interrupted. You must get your BMW up on ramps to replace or check for leaks. Remove the splash shield from under the trans- mission and unplug the wire harness.

yeah that sounds about what i'm expecting to be the case here.. which sucks ultimately.

[spammysammich]

that connector is a real bear to get at. Good luck.

[mikerunt]

mechatronics board is full of oil...