For tuning, you need the pinout. For repair, you need the datasheet. Search for "Bosch [Model Number] data sheet pdf" to find the 120-page engineering document from Bosch Semiconductors.

Not all sources are equal. Here are the five best places to find your datasheet, ranked by reliability and detail.

Attach your CAN-Bus or K-Line leads. Connect the Ignition (+12V switched) wire last. Watch your power supply's current display; a healthy Bosch ECU resting on a bench typically draws between . Anything over 1.0A indicates a short circuit or wrong pin connection. 6. Pro-Tips for Finding Elusive Diagrams

Known for high-density connectors (often 94, 128, or 144 pins).

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Legacy systems utilizing mechanical throttles and distributor ignition.

If you can tell me the (starts with 02...) and vehicle model , I can help you find a specific pinout or give you the best source to find it. Share public link