The Bosch ME2.0 (Motronic) is an early electronic engine control unit (ECU) that manages ignition timing, fuel injection, and emissions for Mercedes-Benz engines like the M111 (inline-4) and M112 (V6). For "bench" work—which involves connecting to the ECU outside the car—verified pinouts are required to safely provide power and ground without damaging the internal circuitry.
Note: Always verify the physical connector section numbers on your specific unit, as minor variations exist across Mercedes-Benz models like the W202 or W210. Why Verification Matters
For the purposes of this essay, the pinout data provided below represents the most commonly verified configuration for the standard ME20 harness used in widespread applications (such as the Opel/Vauxhall Corsa D or similar platforms utilizing this ECU family).
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The ME2.0 uses a multi-section connector. Below are verified functions for key sensors and actuators: : Ignition Coils : Section 1, Pins 1, 2, 3, and 6. Fuel Injectors : Section 3, Pins 5, 6, 7, and 8. Fuel Pump Relay : Section 4, Pin 12. Sensors : Crankshaft Position Sensor : Section 3, Pins 12 and 13. Camshaft Position Sensor : Section 3, Pin 3. Engine Coolant Temp (ECT) : Section 3, Pins 16 and 17. Special Procedures: IMMO OFF and Virginizing
Note: This document summarizes a verified pinout for the Bosch ME20 engine control unit (ECU), along with wiring notes, common signals, testing tips, and safety/diagnostic considerations. Use it for reference during bench-testing, wiring harness repair, diagnostics, or retrofit projects. Confirm with continuity testing and the specific ECU label/connector before making permanent wiring changes.
The Stack Exchange result (result 0) provides a pinout from Bosch, which is crucial for the "verified" aspect. I'll cite that source. I also have some information about ME2.0 and ME2.1 from the BenzWorld thread, including diagnostic pinouts and flashing procedures. I also have information about pedal value sensors and EVAP purge systems from 124performance.com. I can also include safety precautions. The Bosch ME2
This ECU communicates via ISO 9141 (K-Line) . It does not use CAN-Bus for primary OBDII diagnostics in most early versions. ⚠️ Critical Safety Precautions
Improper voltage on Connector B pins 1 or 20 will cause limp mode.
These lines allow OBD2 scanners and flash tuning tools to establish a data link with the ECU. Pin Number Signal Name Description Primary diagnostic and flashing line ISO 9141-2 Pin 56 Wake-up/Initialization line (if applicable) ISO 9141-2 3. Essential Peripheral Links (For Engine Swaps) Why Verification Matters For the purposes of this
Signals for individual cylinders are typically distributed across the larger connector blocks.
: Sensor Power Supply — Regulated +5V output from the ECU to power the MAF and TPS.
The Bosch ME20 engine control unit (ECU)—often found labeled as the ME2.0—is a foundational electronic control module used extensively in late 1990s and early 2000s vehicles. Most notably, it managed Mercedes-Benz M112 V6 and M113 V8 engines, alongside select Volvo and Volkswagen powerplants.
I'll cite the relevant sources. I'll also include a disclaimer about the risks of working with ECUs.
