Me7.4.5 Pinout |verified| -

Various professional tuning interfaces support this ECU via pinout: DFB Technology : Offers a full system driver for reading and writing via pinout. Combiloader : Provides a specific Bosch ME7.4.5 PSA (J2534) module for these units. DFB Technology

The ME7.4.5 is very popular for performance tuning. Tuning involves modifying the fuel, ignition, and boost (for turbocharged models like the 1.8T) maps within the ECU software. This is typically done via the OBD port, but sometimes requires a bench or boot mode connection. The wide availability of ME7.4.5 mapping files, from stage 1 tunes to full custom calibrations, makes it a favorite among DIY tuners and professional shops alike.

The is a staple engine management system found extensively across the PSA (Peugeot/Citroën) lineup, primarily regulating the 1.6L 16V petrol engines (such as the TU5JP4). For automotive technicians, tuners, and DIY enthusiasts, having an accurate ME7.4.5 pinout map is indispensable. Whether you need to fix a wiring fault, clone a damaged unit, bypass an immobilizer (IMMO OFF), or flash a performance map on a test bench, knowing where to apply power and trace signals is the critical first step. Hardware Architecture of the Bosch ME7.4.5

Connector 32V Black (CC) — Pin H2

If an ECU is "bricked" due to a failed OBD flash, bench recovery is your only option.

Depending on the flashing interface you use, you will connect via K-Line, CAN-Bus, or both. Connector 32V Grey (CH) — Pin A4 CAN-High (CAN-H): Connector 32V Grey (CH) — Pin L4 CAN-Low (CAN-L): Connector 32V Grey (CH) — Pin M4

Airflow/Air Metering & Idle Control

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

Here is a detailed breakdown of the ME7.4.5 pinout:

Several resources were used to compile this guide. For further information, consider consulting these sources, which were invaluable in creating this article. me7.4.5 pinout

If an ECU becomes bricked during an OBD write error, you must force it into .

| Pin | Connector | Signal Name | Description | Typical Function | |------|-----------|----------------|--------------------------------|--------------------------| | 1 | A | Ground | Sensor ground | - | | 2 | A | EVAP Canister Purge Valve (N80) | Duty cycle control | Emissions | | 3 | A | Ground | Power ground for injectors/coils | - | | 4 | A | +12V Battery | Permanent power (Terminal 30) | ECU memory | | 5 | A | +12V Switched (Terminal 15) | Switched via ignition | Wake-up signal | | 6 | A | CAN-High | Drivetrain CAN bus | ABS, Instrument cluster | | 7 | A | CAN-Low | Drivetrain CAN bus | ABS, Instrument cluster | | 8 | A | Brake light switch signal | Input | Brake pedal | | 9 | A | Clutch pedal switch | Input | Cruise control / starting | | 10 | A | A/C compressor request | Input | Climate control | | 11 | A | Radiator fan activation (low speed) | Output | Cooling | | 12 | A | Radiator fan activation (high speed) | Output | Cooling | | 13 | A | --- | Not used | - | | 14 | A | Alternator excitation signal | Output | Charge warning | | 15 | A | Diagnostic K-Line (ISO 9141) | Bi-directional | OBD2 communication | | 16 | A | --- | Not used | - | | 17 | A | --- | Not used | - | | 18 | A | --- | Not used | - | | 19 | A | Fuel pump relay control | Output | Activates FP relay | | 20 | A | Engine speed output (RPM signal) | Output | Tachometer cluster | | 21 | A | MIL (Check engine light) | Output | Warning lamp | | 22 | A | EPC light | Output | Electronic Power Control | | 23 | A | +5V Sensor supply | Reference voltage | For MAP, TPS, etc. | | 24 | A | --- | Not used | - | | 25 | A | --- | Not used | - | | 26 | A | --- | Not used | - | | 27 | A | --- | Not used | - | | 28 | B | Knock sensor 1 (cyl 1 & 2) | Signal input | Ignition timing control | | 29 | B | Knock sensor 2 (cyl 3 & 4) | Signal input | Ignition timing control | | 30 | B | Sensor ground (shield) | For knock sensors | - | | 31 | B | Intake Air Temp (IAT) | Signal input | Inside MAF or TMAP | | 32 | B | Engine Coolant Temp (ECT) | Signal input | Temperature compensation | | 33 | B | Shield ground | For crank/cam sensors | - | | 34 | B | MAF signal | Frequency/duty cycle | Airflow metering | | 35 | B | MAF ground | Sensor return | - | | 36 | B | G28 Engine speed (crank sensor) | Differential signal (-) | RPM base timing | | 37 | B | G28 Engine speed (crank sensor) | Differential signal (+) | RPM base timing | | 38 | B | G40 Camshaft position sensor | Hall effect signal | Sequential injection | | 39 | B | Throttle position sensor (G187) | Signal 1 (closing) | ETC | | 40 | B | Throttle position sensor (G188) | Signal 2 (opening) | ETC redundancy | | 41 | B | Accelerator pedal position (G79) | Signal 1 | Driver demand | | 42 | B | Accelerator pedal position (G185) | Signal 2 | Redundant signal | | 43 | B | MAP sensor (Integrated) | Boost pressure signal | Inside ECU case | | 44 | B | MAP sensor ground | Internal ECU | - | | 45 | B | External MAP (for some models) | Boost input (rare) | - | | 46 | B | --- | Not used | - | | 47 | C | Injector cylinder 1 | Output (ground switch) | Fuel delivery | | 48 | C | Injector cylinder 2 | Output (ground switch) | Fuel delivery | | 49 | C | Injector cylinder 3 | Output (ground switch) | Fuel delivery | | 50 | C | Injector cylinder 4 | Output (ground switch) | Fuel delivery | | 51 | C | Ignition coil 1 (power stage) | Output | Spark | | 52 | C | Ignition coil 2 (power stage) | Output | Spark | | 53 | C | Ignition coil 3 (power stage) | Output | Spark | | 54 | C | Ignition coil 4 (power stage) | Output | Spark | | 55 | C | N75 Boost control valve | PWM output | Wastegate control | | 56 | C | Idle Air Control (N71) | PWM output (if not DBW) | Idle stabilization | | 57 | C | Secondary air injection pump relay | Output | Cold start emissions | | 58 | C | Secondary air injection valve (N112) | Output | Air diverter | | 59 | C | O2 sensor heater (Bank 1, Sensor 1) | Output | Lambda heating | | 60 | C | O2 sensor heater (Bank 1, Sensor 2) | Output (post-cat) | Heating | | 61 | C | O2 sensor (Sensor 1) signal | Input (0-1V or wideband) | AFR | | 62 | C | O2 sensor (Sensor 1) ground | Ground for lambda | - | | 63 | C | O2 sensor (Sensor 2) signal | Input | Post-cat monitoring | | 64 | C | O2 sensor (Sensor 2) ground | Ground | - | | 65 | C | Fuel tank pressure sensor | Input | Leak detection | | 66 | C | --- | Not used | - | | 67 | C | --- | Not used | - | | 68 | C | --- | Not used | - | | 69 | A | +12V Switched (Terminal 15) duplicate | Redundant | Safety | | 70 | A | Ground | Power ground | High current | | 71 | A | Ground | Power ground | High current | | 72 | A | +12V Battery duplicate | Redundant main power | - | | 73 | A | +12V Battery duplicate | Redundant main power | - | | 74-121 | --- | Various unused or vehicle-specific pins | (e.g., cruise control, A/C pressure) | Check wiring diagram |

If the ECU becomes bricked due to a corrupt flash or requires deep-level forensic programming, you must access its internal circuit board to trigger . The processor inside shares an architecture similar to the Bosch M7.9.7+ platform. BOSCH ME745 или BOSCH ME7.4.5 Various professional tuning interfaces support this ECU via

Working with an ECU and its pinout involves risks. Always adhere to the following safety measures: