For diagnostic and bench testing, the following core pin assignments are widely recognized: Main Power (+12V)
For standard bench communication or power testing, the following pins are typically identified for the Bosch ME 2.0 (Mercedes-Benz) :
To read or write to the Bosch ME20 on the bench using tools like Kess, K-Tag, Galletto, or generic EEPROM programmers, follow this structural workflow: 1. Hardware Preparation
| Pin # | Signal Name | Description | | --- | --- | --- | | 11 | CK_Speed | Engine speed sensor input | | 12 | CK_Pos | Crankshaft position sensor input | | 13 | CAM_Pos | Camshaft position sensor input | | 14 | ECT | Engine coolant temperature sensor input | | 15 | IAT | Intake air temperature sensor input |
To scan the ECU for trouble codes or read live data parameters, you must hook up these lines to your OBD2 port or Mercedes 38-pin diagnostic connector. Pin Number / Signal Destination OBD2 Pin 7 / 38-Pin Connector Diagnostic Data Communication CAN-High Vehicle Network Bus High-Speed Powertrain CAN CAN-Low Vehicle Network Bus High-Speed Powertrain CAN 3. Essential Sensor Inputs (Engine Vital Signals)
To help tailor this information to your specific project, tell me: What does your ECU come from, and are you using this pinout for diagnostics, a bench flash, or an engine swap ?
If the reading is exactly 5.0V, the ECU internal voltage regulator is functioning.
Verify that the ground pin of your OBD2 interface/tool is tied to the exact same ground source as the ECU power supply ground.
For flashing the ME20.1 ECU, you must put the ECU into boot mode. This is typically done by bridging the 12V line to Pin 5 on the 38‑pin diagnostic port and connecting the flashing tool (e.g., Kess V2, Galletto 1260).
There are two main hardware variants:
A: Variations can occur between model years and vehicle models. Always verify using the ECU part number and physical connector labels. Use a multimeter to confirm pin functions before making permanent connections.
Primary engine sensors (crank, cam, knock).