For engine conversion projects or standalone wiring loom builds, these are the primary control outputs. Pin Number Connector/Plug Function Description 48-Way Brown (CB) Crankshaft Position Sensor (RPM Signal) Pin C1 (Plug C) 32-Way Grey (CC) Fuel Injector Cylinder 1 Control Pin C2 (Plug C) 32-Way Grey (CC) Fuel Injector Cylinder 2 Control Pin D1 (Plug C) 32-Way Grey (CC) Fuel Injector Cylinder 3 Control Pin D2 (Plug C) 32-Way Grey (CC) Fuel Injector Cylinder 4 Control Pin A1 (Plug C) 32-Way Grey (CC) Ignition Coil Control (Pairs/Direct) Bench Flashing Connection Guide (Boot Mode & K-Line)
If you are attempting to recover a "bricked" ECU or need a full backup of the flash memory, you may need to put the ECU into Boot Mode. This usually involves grounding a specific point on the circuit board (often a pad near the flash chip) while powering on the unit. This bypasses the standard software check and allows direct access to the processor. Common Applications for Pinout Knowledge
Working with ECU pinouts carries risks. Ensure you use a regulated 12V power supply to avoid voltage spikes. Cross-referencing multiple diagrams is highly recommended, as manufacturers occasionally change pin assignments between different engine codes (e.g., 1.6L vs 2.0L engines).
for deep reading or writing (e.g., using Piasini or similar tools), internal modifications are required: Resistor Setup 6.8k Ohm (6k8) resistors to the designated internal pads. Component Removal : One specific internal resistor must be from the ECU board to enable the boot state.
A "Soldered wire" or "Gray wire" is typically used to bridge the boot point to ground to trigger the mode during power-up. Compatible Vehicles This ECU version was widely used in models produced between 2004 and 2008 , including: 206, 207, 307 C2, C3, C4, Berlingo Professional Documentation me745 pinout free
Locate the specific boot pad on the PCB layout (traditionally pad 104 or an isolated pad near the flash memory).
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during a flash. A voltage drop can corrupt the firmware and render the ECU dead.
The Bosch ME7.4.5 manages engine functions for various PSA models, such as the Peugeot 206, 307, Partner, and Citroën C3, C4. It is known for controlling older, reliable naturally aspirated or turbocharged engines. Manufacturer: Bosch Protocol: ME7.4.5 Application: Peugeot/Citroën (PSA Group) For engine conversion projects or standalone wiring loom
* **Always refer to the pinout diagram:** Before connecting any external device to the ME745, always refer to the pinout diagram to ensure that you are using the correct pins.
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Bosch ME7.4.5 engine control unit (ECU), commonly used in Peugeot and Citroën vehicles (like the 206, 207, 307, C2, and C4), has specific pin assignments for power, grounding, and communication. This model typically features a 3-plug system (32-48-32 pins), where Plug C (Gray) is primarily used for bench connections and boot mode. Bosch ME7.4.5 Bench Pinout (Plug C)
| Pin Number | Pin Name | Description | Critical Notes | |------------|----------|-------------|----------------| | 1 | BS (Bootstrap) | High-side gate driver supply | Connect a 0.1µF capacitor between BS and SW | | 2 | GND | Ground pin | Must be connected to exposed pad for thermal relief | | 3 | FB (Feedback) | Output voltage sensing | Connects to a resistor divider from VOUT | | 4 | EN (Enable) | Chip on/off control | High = ON (>1.2V); Low = OFF (<0.4V) | | 5 | IN (Input Voltage) | Power input (4.5V to 18V) | Decouple with 10µF + 0.1µF ceramic caps to GND | | 6 | SW (Switch Node) | Switching output to inductor | Connect to 4.7µH–22µH inductor | | 7 | NC | No Connect | Leave floating or tie to GND | | 8 | SS (Soft-Start) | Soft-start capacitor pin | Capacitor to GND sets inrush current limit | | | GND | Thermal/electrical ground | Solder to large PCB ground plane | This bypasses the standard software check and allows
ME7.4.5 ECU Pinout Guide: Wiring Diagram and Bench Flash Connections
Note: Pinout configurations can sometimes vary depending on the specific vehicle model (e.g., Peugeot 206 vs. Citroën C4). Always verify with a multimeter before applying power to prevent bricking the ECU. Sensor Reference Voltages
Detailed visual diagrams and step-by-step guides for this specific unit are available through the following sources: Digital Documentation : You can find complete wiring schematics on Scribd's ME7.4.5 ECU Guide ECU Design's Pinout Database Visual Walkthroughs
The Bosch Motronic ME7.4.5 controls 16V petrol engines (such as the 1.4L and 1.6L variants) found in popular models like the Peugeot 206, 207, 307, and Citroën C3, C4, and Berlingo. Inside the hardware casing, you will typically find:
If you are looking for a to perform ECU cloning, immo-off (immobilizer bypass), or flashing a performance map, you will likely need to put the ECU into Boot Mode . This bypasses the standard OBD2 communication and allows direct reading and writing to the microprocessor's flash memory. Requirements for Bench Flashing: power supply (at least