Bosch Me20 Pinout Verified
For bench testing, diagnostic communication (K-Line), or basic programming, the following connections are typically required: +12V Power : Connect to Pin 1 of Section 5. Ground (GND) : Connect to Pins 4, 5, and 6 of Section 5. K-Line (Diagnosis) : Pin 8 or 28 of Section 4. Ignition (Switch-on Signal) : Pin 24 of Section 4. Fuel Pump Relay : Pin 12 of Section 4. Main Relay : Pin 11 of Section 4. Key Technical Considerations Software Variations
MAP, MAF, Crankshaft, Camshaft, Oxygen Sensors.
: While the hardware is often similar across V6 (M112) and V8 (M113) engines, the internal coding determines compatibility with manual or automatic transmissions. bosch me20 pinout verified
Place the module on a non-conductive ESD mat. Connect Grounds: Secure the negative lead to Plug 1, Pin 4. Connect Constant Power: Attach +12V to Plug 1, Pin 2.
| Pin | Signal Name | Verified Function | Behavior | | :--- | :--- | :--- | :--- | | | Injector Cyl 1 | Ground switched by ECU | 12V feed from main relay | | 3 | Injector Cyl 2 | Ground switched | 12V feed | | 4 | Injector Cyl 3 | Ground switched | 12V feed | | 5 | Injector Cyl 4 | Ground switched | 12V feed | | 8 | Ignition Coil 1 (A) | IGBT trigger | 0.5 – 3.5V dwell | | 9 | Ignition Coil 2 (B) | IGBT trigger | 0.5 – 3.5V dwell | | 10 | Ignition Coil 3 (C) | IGBT trigger (4-cyl wasted spark) | As above | | 11 | Ignition Coil 4 (D) | IGBT trigger | As above | | 16 | Idle Air Control (IAC) | Stepper motor coil 1A | 12V pulsed | | 17 | IAC Coil 1B | Stepper motor | 12V pulsed | | 18 | IAC Coil 2A | Stepper motor | 12V pulsed | | 19 | IAC Coil 2B | Stepper motor | 12V pulsed | | 24 | Main Relay Control | ECU grounds to power relay | 0V (relay ON) | | 25 | MIL (Check Engine) | Lamp ground control | 0V when active | | 30 | EVAP Purge Solenoid | PWM ground control | 12V feed present | Ignition (Switch-on Signal) : Pin 24 of Section 4
ME20 CONNECTOR A (55-pin): A1: Relay out | A2: Batt+ | A3: Ign+ | A4: Sen Gnd | A5: Pwr Gnd A18: CKP+ | A19: CKP- | A32: CMP | A33: TPS | A40/41: Knock A54: CAN H | A55: CAN L
If you are performing high-level repairs, manufacturers like ECU Repairs offer testing services that bypass the need for manual pin probing, ensuring the unit is functionally sound before you attempt to modify it. Summary Table for Quick Reference Key Technical Considerations Software Variations MAP
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The 80-pin connector is used for additional I/O and sensor connections.
| Pin Number | Signal Name | Description | | --- | --- | --- | | 10 | VSS | Vehicle speed sensor | | 20 | PTO | Power take-off sensor |