Bosch Motronic Ecu Pinout | [top]

Many no-starts trace to pin 7 (main relay control). If the ECU does not ground pin 7, the DME relay never powers injectors/coils. Jump relay temporarily to test.

Summary: Bosch Motronic is a family of engine control units (ECUs) used widely across gasoline engines from the 1980s onward. Motronic integrates fuel injection and ignition control; pinouts vary by model (e.g., Motronic 1.1, 1.3, 1.5, 2.1, 2.8, 2.9, 3.1, 5.1, 7.x) and vehicle manufacturer harness. Below is a structured, practical reference covering typical signal groups, common pin functions, diagnostic connections, and examples for several widely used Motronic variants. This is a technical overview — verify pin numbering and connector keying against the specific ECU part number and wiring harness. bosch motronic ecu pinout

All other pins (EGR, evap, secondary air) can be deleted. Many no-starts trace to pin 7 (main relay control)

Predominant in M1.1, M1.2, M1.3, M2.x, and M3.x systems (common on BMW, Mercedes, Porsche, and PSA vehicles of the 1980s-1990s). Summary: Bosch Motronic is a family of engine