Editing Openai/6940b2df-db80-8003-b707-4cc5cbedf6d9 (section)

==== Your symptom screams: either DME isn’t powered/awake or it’s awake but you’re missing fuel/spark or start authorization. ====

===== 1. Put the charger on the jump post + ground (stable voltage). =====
# Plug in K+DCAN, ignition ON (cluster lit).
# Open ISTA → Operations → Read out vehicle data → Complete identification
# Run Vehicle Test.
# Look at the control unit tree: - If DME is not responding, that’s a giant arrow toward A46 / fusible link / DME power feed (because the starter can still crank on its own feed).
# Pull fault memory for DME + CAS.
# Run the guided test plan for engine does not start (ISTA will walk you through rpm while cranking, start enable, etc.).

===== 1. Open INPA, choose E90 chassis. =====
# Go into CAS: - Look for start enable / terminal 50 request / key recognized style statuses.
# Go into DME (MSV/MSD for N52): - Confirm you can communicate - Watch live data while cranking: RPM signal (if 0 rpm, crank sensor/rpm input problem) - Check any “start conditions not met” flags

===== ISTA-P is for programming/coding. Don’t bring it out until: =====
* the car starts reliably, and
* you have stable power supply voltage (programming on shaky voltage is how modules get bricked).