Back-probe the connector pins carefully to avoid spreading the internal terminals.
: Typically connected to the ECU casing or specific ground pins on the larger connector.
Note: Always confirm your specific ECU part number (e.g., 0 261 204 192) – but 90% of ME20 variants follow this layout. bosch me20 pinout verified
These variables dictate the baseline air-mass calculations and warm-up fuel enrichment maps.
Because of the age of these modules, thermal cycling causes cracked solder joints around the main connector pins. If you experience intermittent loss of crank sensor signals or random power cuts, removing the ECU cover and reflowing the solder on the pin blocks usually resolves the issue. If you need help finishing your project, tell me: What vehicle did this ECU come from? Back-probe the connector pins carefully to avoid spreading
| 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 |
A healthy ME2.0 draws 0.15A to 0.40A on standby. Higher draw indicates a short circuit. If you need help finishing your project, tell
Verify that the main engine relay is clicking over and supplying secondary power down the line.
