For ME20.2, the Grey and Black are on the same 64-pin housing but separated by a key.
Plug E interfaces the engine with the vehicle chassis. When swapping a Mercedes V6 or V8 engine into a non-Mercedes vehicle, this plug dictates your ignition switch and diagnostic inputs. Switched Ignition (+12V Input from key switch) Pin 5: Throttle Pedal Sensor (Drive-by-Wire) Channel 1 Pin 6: Throttle Pedal Sensor (Drive-by-Wire) Channel 2 Pin 11: K-Line Diagnostics (Connects to OBD2 port Pin 7)
Never exceed 13.5 Volts DC on your bench power supply.
| Pin | Function | Verified Status | |------|-------------------------------|------------------| | A1 | Main relay control (output) | ✅ Verified | | A2 | Battery voltage (permanent) | ✅ Verified | | A3 | Ignition switch input | ✅ Verified | | A4 | Sensor ground (ECU reference) | ✅ Verified | | A5 | Engine ground (power stage) | ✅ Verified | | A18 | Crankshaft position sensor (+) | ✅ Verified | | A19 | Crankshaft position sensor (-) | ✅ Verified | | A32 | Camshaft position sensor signal | ✅ Verified | | A33 | Throttle position sensor (wiper) | ✅ Verified | | A40 | Knock sensor 1 | ✅ Verified | | A41 | Knock sensor 2 | ✅ Verified | | A54 | CAN High (diagnostics/immobilizer) | ✅ Verified | | A55 | CAN Low | ✅ Verified | bosch me20 pinout verified
Section 1, pins 1, 2, 3, and 6 are dedicated to the ignition coils.
Before pinning out the ECU, inspect the connector face closely. The plastic housing contains molded-in numbers at the corners of each plug chamber to indicate pin numbers.
Are you doing a or standard bench diagnostics ? For ME20
The Bosch ME20 engine control unit (ECU) is a sophisticated piece of technology that manages engine functions in many vehicles, particularly from the late 1990s to early 2000s. However, finding a —a reliable, official pin assignment for the ECU’s connectors—is notoriously difficult.
To help with identification, all Bosch ECUs start with serial numbers like 028… or 026… . If you have a Bosch ECU in hand, you can use these numbers to search the official Bosch databases, which can help confirm the exact model.
The Bosch ME20 uses a high-density multi-plug connector system. Pin numbers are molded directly into the plastic housing on both the wire harness side and the ECU header pins. Switched Ignition (+12V Input from key switch) Pin
The Bosch ME20 pinout is essential for several reasons:
| Pin | Signal Name | Verified Function | Critical Note | | :--- | :--- | :--- | :--- | | | ECU Ground (Power) | High-current grounds for injectors | Must be < 0.1Ω to battery (-) | | 4, 5 | Battery Voltage (Permanent) | Direct 12V from fuse | Always powered | | 6 | Switched 12V (after relay) | 12V from main relay | Powers logic circuits | | 14 | CAN High (J1850/KWP2000) | Diagnostic bus (if used) | 2.5 – 3.5V | | 15 | CAN Low | Diagnostic bus | 1.5 – 2.5V | | 20 | O2 Sensor Heater (Pre-cat) | Ground control for heater | ~1.2A @ 12V | | 21 | O2 Sensor Heater (Post-cat) | Ground control for heater | As above | | 22 | Lambda 1 Signal (Pre-cat) | Narrowband O2 signal | 0.1 – 0.9V oscillating | | 23 | Lambda 2 Signal (Post-cat) | Narrowband O2 signal | 0.45V steady (if cat working) | | 30 | K-Line (ISO 9141) | Diagnostic communication | 0 – 12V pulsed | | 31, 32 | Shield grounds | For sensor cables | Continuity to pin 2 (black) |
Before applying power, identify your specific module. The Bosch ME2.0 housing features a multi-plug connector system divided into distinct modular blocks (often labeled Modular Engine Management).
What is the exact of the donor vehicle for this Bosch ME20 ECU?