Bosch Me20 Pinout Verified __top__ -
To safely read, clone, or diagnose a Bosch ME20 ECU on your workbench, follow this connection sequence:
Double-check your ground and power pins before turning on the power supply. Reversing polarity will destroy the ECU internal voltage regulators instantly. 📍 Bosch ME20 Verified Pinout Configuration
: Typically connected via the main relay pins and ignition switch signals. Ground (GND) bosch me20 pinout verified
| Pin | Function | Connector | |-----|------------------------------|-----------| | C21 | Purge Valve | C | | C22 | +5V PPS1 | C | | C23 | GND PPS1 | C | | C24 | Signal PPS1 | C | | C25 | Signal PPS2 | C | | C26 | GND PPS2 | C | | C27 | +5V PPS2 | C | | C28 | Air Pump Relay | C | | C29 | FPR Trigger | C | | C31 | O2b SGND | C | | C32 | O2b Signal | C | | C39 | OBD2(7) DLC(4) | C | | C40 | Starter Signal | C |
Check for 12V at Circuit 15 with the ignition key turned to the "ON" position. To safely read, clone, or diagnose a Bosch
| Pin # | Signal Name | Description | | --- | --- | --- | | 31 | Inj_1 | Fuel injector control (cylinder 1) | | 32 | Inj_2 | Fuel injector control (cylinder 2) | | 33 | Ign_1 | Ignition coil control (cylinder 1) | | 34 | Ign_2 | Ignition coil control (cylinder 2) | | 35 | Main_Relay | Main relay control |
Disclaimer: This is based on bench testing a 2001-2003 VAG/Volvo/PSA unit (HW: 0261204222). Always verify with a meter for your specific chassis. Ground (GND) | Pin | Function | Connector
Sometimes people confuse ME pinouts with Simos (like Simos 18), but the Bosch ME housing shapes (the "Sandcastle" design) are distinct. The pin numbering (1-xx on one side, xx-yy on the other) is counter-intuitive compared to Japanese ECUs.
Use a multimeter to verify zero resistance between Pin 55 of the ECU and Pin 7 of your OBD2 tool interface.
If you’ve spent any time working on late-90s to mid-2000s European vehicles—especially —you’ve likely crossed paths with the Bosch ME20 engine control unit (ECU).
: Repair shops use verified pinouts to power the unit outside the vehicle to check for sensor signal issues or communication faults.
