– Disconnect all injectors. Measure resistance from each injector control pin to ground (should be high, >10kΩ). Then continuity from injector signal wire to ECU pin.
While pin configurations vary between specific models (e.g., M7.4.4 vs. M7.9.7), most Bosch M7 units follow a standardized logic for primary connections. Bosch M7 Ecu Pinout