Bosch Me20 Pinout Verified — [hot]

Pin 6 (Outputs a ground signal to trigger the fuel pump relay). Step-by-Step Guide for Bench Setup and Flashing

| Pin # | Signal Name | Description | | --- | --- | --- | | 1 | VBatt | Battery voltage supply | | 2 | GND | Ground | | 3 | Ref_Volt | Reference voltage (5V) | | 4 | IGN_SW | Ignition switch input | | 5 | START_SW | Starter switch input |

Ensure the ECU is placed on a non-conductive surface (antistatic mat or clean wood/plastic). bosch me20 pinout verified

| Pin | Function | Connector | |-----|------------------------------|-----------| | D2 | Evap | D | | D4 | Fuel GND | D | | D5 | Fuel Sig | D | | D6 | Fuel +V | D | | D7 | O2a SGND | D | | D8 | O2a Signal | D | | D11 | CANH | D | | D12 | CANL | D | | D19 | Starting system (NSS) | D | | D20 | CC + | D | | D21 | CC - | D | | D22 | CC recall | D | | D23 | Brake Sw | D | | D24 | CC off | D |

Before diving into the pinout, you must identify which ME20 sub-version you have. Pin 6 (Outputs a ground signal to trigger

Note: Pin assignments can vary slightly depending on the vehicle manufacturer (e.g., Mercedes vs. Volvo). The layout below represents the standard Bosch ME2.0 master configuration for bench power-up and basic diagnostics. 1. Power and Ground (Essential Connections)

If you are tracing a wiring harness fault on a vehicle, these pins handle the primary input signals required for the engine to run: Pin Function Pin Location Description Connector 2, Pin 16 Engine speed and timing signal Crankshaft Position Sensor (-) Connector 2, Pin 17 Engine speed return signal Camshaft Position Sensor Connector 2, Pin 12 Cylinder 1 synchronization Mass Air Flow (MAF) Signal Connector 3, Pin 4 Intake air volume tracking Coolant Temperature Sensor Connector 3, Pin 19 Engine coolant temperature input Step-by-Step Bench Setup Procedure Note: Pin assignments can vary slightly depending on

The BOSCH ME20 ECU is a reliable and well-documented engine management system. With this verified pinout guide, you can confidently perform diagnostics, repairs, and modifications. Always prioritize safety and accuracy—verify all connections with a multimeter and consult professional resources when in doubt. Whether you're swapping engines, tuning for performance, or simply maintaining your classic Mercedes, this pinout is your key to success.