Me7.4.5 Pinout Jun 2026

Typically driven by an STMicroelectronics ST10F275 or similar ST10-series MCU. This central processor governs the primary injection maps, ignition curves, and sensor parameters.

Depending on your interface, you will use either the CAN high/low pins or the K-Line for older diagnostic protocols. Pin A4 (32-Way Grey Connector) CAN Low: Pin A3 (32-Way Grey Connector) K-Line: Pin B4 (32-Way Grey Connector) Detailed Connector Breakdown 32-Way Grey Connector (Connector C) me7.4.5 pinout

This is the most common failure point. If the ground points on the engine block or chassis are corroded, the high current seeks alternative paths. Pin A4 (32-Way Grey Connector) CAN Low: Pin

A very specific topic!

| Pin No. | Function | Description | | :--- | :--- | :--- | | | Ground (Power) | ECU Main Ground (to chassis/battery) | | A2 | Ground (Power) | ECU Main Ground | | A3 | Switched Power (+12V) | Main Relay Output (Input to ECU) | | A4 | Ground (Power) | ECU Main Ground | | A5 | Ground (Signal) | Sensor Ground Return | | A6 | Switched Power (+12V) | Main Relay Output (Input to ECU) | | B1 | +12V Battery | Permanent Battery Voltage (Keep Alive Memory) | | B2 | Main Relay Control | ECU switches this to ground to activate the Main Relay | | B3 | Ground (Signal) | Sensor Ground Return | | Pin No

Always use a stabilized 12V-14V power supply. Low voltage during a write sequence can "brick" the ECU.

Click to ensure the software reads the ECU hardware and software numbers correctly.