This is written for a technical audience (tuners, mechanics, DIY ECU swappers). It assumes the user has verified the data and wants to share it to build credibility.
The Bosch is an engine control unit primarily used in Mercedes-Benz vehicles, particularly those with M112 and M113 engines. Verified pinout details for this ECU are essential for diagnostic testing, bench flashing, or boot mode procedures. Core Connection Pinout
Signals for individual cylinders are typically distributed across the larger connector blocks. bosch me20 pinout verified
For bench-top communication or basic testing, use the following verified pin connections: Permanent Power (+12V):
With a steady hand, he connected the programmer, selecting the 4E28B mask as instructed by the ECU reset procedure . He held his breath as the status bar crawled across the screen. When the "Verified" message finally flashed green, the silence of the garage was broken by the rhythmic clicking of the relays—the old Mercedes was ready to breathe again. AI responses may include mistakes. Learn more This is written for a technical audience (tuners,
Section 3, pins 5, 6, 7, and 8 control the fuel injectors; Section 4, pin 12 controls the fuel pump relay.
| 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 | Verified pinout details for this ECU are essential
Here's a breakdown of the ME20 pinout:
A common reason for verifying this pinout is to perform an "IMMO OFF" procedure. On many ME 2.0 units, this involves: Opening the ECU casing to access the internal circuit board. Modifying the Motorola HC11 processor: