For technicians using tools like New Trasdata or Piasini Engineering to remap the ECU, specific pins are required for communication: Bosch ME7.4.4/M7.4.4 ECU Overview | PDF - Scribd
Probe B5 (ECT signal) to B15 (ground) . With engine cold, voltage should be ~2.5V (20°C). Start engine – voltage should drop as coolant warms. Bosch M7 Ecu Pinout
Diagnostics & communication
Power & ground