Me7.4.5 Pinout Extra Quality Jun 2026

Use an anti-static mat when opening the ECU case to avoid damaging the CMOS components.

The ME7.4.5 uses "Peak and Hold" injector drivers. If you have a misfire on a specific cylinder: me7.4.5 pinout

| Pin | Signal | Description | |------|----------------|------------------------------| | 1 | Power | Permanent +12V (ECU main) | | 2 | Ground | Power ground | | 3 | Ignition output | Ignition coil cylinder 1 | | 4 | Ignition output | Ignition coil cylinder 2 | | 5 | Ignition output | Ignition coil cylinder 3 | | 6 | Ignition output | Ignition coil cylinder 4 | | 7 | Injector output | Injector cylinder 1 | | 8 | Injector output | Injector cylinder 2 | | 9 | Injector output | Injector cylinder 3 | | 10 | Injector output | Injector cylinder 4 | | 11 | O2 sensor heater | Pre-cat O2 heater (bank1) | | 12 | O2 sensor heater | Post-cat O2 heater | | 13 | MAF signal | Mass air flow sensor signal | | 14 | MAF ground | Sensor ground | | 15 | Sensor +5V | Reference voltage | | 16 | Throttle position | TPS signal | | 17 | MAP sensor | Manifold absolute pressure | | 18 | IAT sensor | Intake air temp | | 19 | ECT sensor | Engine coolant temp | | 20 | Knock sensor 1 | Signal | | 21 | Knock sensor 2 | Signal | | 22 | Cam position | Hall sensor signal | | 23 | Engine speed | Crank sensor signal | | 24 | CAN low | Diagnostic CAN bus | | 25 | CAN high | Diagnostic CAN bus | | 26 | K-line | Diagnostic K-line (ISO 9141) | | 27 | N75 valve | Boost control solenoid | | 28 | EVAP purge | Purge valve control | | 29 | SA output | Secondary air injection relay | | 30 | Fuel pump relay | Control signal | | 31 | Main relay | Power supply relay control | | 32 | Ground | Sensor ground | | 33 | +5V | Sensor supply | | 34 | TPS ground | Throttle position ground | Use an anti-static mat when opening the ECU

The Bosch Motronic ME7.4.5 is one of the most iconic Engine Control Units (ECUs) from the late 1990s and early 2000s. Found primarily in Volkswagen and Audi Group vehicles (VAG), including the Mk4 Golf GTI (1.8T), Audi TT (8N), Audi A3 (8L), and the SEAT Leon Cupra, this ECU is legendary among tuners and DIY mechanics. Understanding the is critical for everything from wiring an aftermarket wideband sensor to diagnosing a no-start condition or swapping the engine into a classic car. Found primarily in Volkswagen and Audi Group vehicles

The ME7.4.5 belongs to the Bosch Motronic family. It is a "torque-structure" system, meaning it manages engine output based on requested torque. For technicians, the most critical aspect is the three-plug connector system, typically labeled , 48-Way Brown (B) , and 32-Way Grey (C) . Bosch ME7.4.5 Bench Pinout (Essentials)