The Bosch Engine Control Unit (ECU)—often referred to as the DME, Motronic, or EDC (depending on the application)—is the brain of your vehicle. It processes data from dozens of sensors to precisely control fuel injection, ignition timing, boost pressure (for turbo engines), and emission systems. But the ECU cannot function without its nervous system: the wiring harness.
Drop the hardware number in the comments for pinout suggestions. bosch ecu wiring diagram
Engine cranks, no spark, no injector pulse. The Bosch Engine Control Unit (ECU)—often referred to
Verify continuity between ECU pin A2 and battery negative. Resistance should be <1 Ohm. boost pressure (for turbo engines)
Find pin A27 (labeled Terminal 15 – Ignition). Use a multimeter: Should read 12V with key ON. If not, the main relay or fuse is dead.