Bosch M7 Ecu Pinout

While the core remains the same, here are key differences:

| Manufacturer | Model / Engine | Pinout Difference | |-------------------|---------------------------|------------------------------------------------------------------------------------| | Peugeot/Citroën | 1.4L TU3JP (M7.4.4) | No VVT (C3 missing). EVAP on C2. | | Renault | K4M 1.6L (M7.9.7) | Cam sensor (B6) is magnetic, not Hall. A/C compressor on C6 is inverted logic. | | Nissan | QG15/QG18 (M7.9.8) | Additional pins for NATS immobilizer (C15, C16). Different crank trigger pattern. | | Fiat | 1.2L FIRE (M7.2) | Only 48 pins total. No connector C. Injectors on A1-A4, coils on A5-A6. |

How to find your exact diagram:
Search for "Bosch M7 [your ECU number] pinout" or visit forums like PeugeotForums, RenaultForums.co.uk, or NicoClub (Nissan). Bosch M7 Ecu Pinout

| Pin | Function | Signal Type | Voltage / Notes | |-----|-----------------------------|----------------|-----------------------| | C1 | Idle Air Control Valve (IACV) | PWM Output | Duty cycle 20-80% | | C2 | EVAP Purge Solenoid | PWM Output | Ground-switched | | C3 | Variable Valve Timing (VVT) | PWM Output | If equipped | | C4 | Cooling Fan Relay (Low speed) | Output | Ground-switched | | C5 | Cooling Fan Relay (High speed) | Output | Ground-switched | | C6 | A/C Compressor Relay | Output | Ground-switched | | C7 | MIL (Check Engine Light) | Output | Ground-switched to dash | | C8 | Diagnostic K-Line (ISO 9141) | Bidirectional | 0-12V, active low | | C9 | CAN Low (if equipped) | Differential | 1.5-2.5V | | C10 | CAN High (if equipped) | Differential | 2.5-3.5V | | C11 | Fuel Tank Pressure Sensor | Analog Input | For EVAP monitoring | | C12 | EGR Vacuum Modulator | PWM Output | Diesel variants | | C13-C32 | Spare or transmission inputs | - | For automatic versions |

| Pin | Function | Signal Type | Voltage / Notes | |-----|-----------------------------|----------------|-----------------------| | A1 | Main Relay Supply (Battery+) | Power Input | 12V constant | | A2 | Main Relay Supply (Battery+) | Power Input | 12V constant | | A3 | Injector Cyl 1 | Output | Ground-switched (~1-4ms) | | A4 | Injector Cyl 2 | Output | Ground-switched | | A5 | Injector Cyl 3 | Output | Ground-switched | | A6 | Injector Cyl 4 | Output | Ground-switched | | A7 | Ignition Coil 1 (Power stage) | Output | 0-5V logic to igniter | | A8 | Ignition Coil 2 | Output | 0-5V logic | | A9 | Ignition Coil 3 (if 6 cyl) | Output | N/A for 4-cyl | | A10 | Ignition Coil 4 | Output | N/A for 4-cyl | | A11 | Fuel Pump Relay Control | Output | Ground-switched to relay | | A12 | Main Relay Control | Output | Ground-switched | | A13 | ECU Ground (Power) | Ground | To engine block | | A14 | ECU Ground (Power) | Ground | To engine block | | A15 | Sensor Ground (Analog) | Ground | Dedicated ground | | A16 | Sensor Ground (Digital) | Ground | Dedicated ground | | A17-A22 | Spare / Not used | - | - | | A23 | Knock Sensor Shield | Ground | Shield only | | A24 | Knock Sensor Signal | Input | AC 0-5V | | A25-A32 | Injector returns / unused | - | - | While the core remains the same, here are

If you are bench-flashing an M7 ECU, you only need:

Power those, and the ECU will wake up for reading/writing via Boot Mode or OBD. | Pin | Function | Signal Type |

Document ID: BOS-M7-2024
Applicable Systems: Bosch Motronic M7.x (M7.0, M7.2, M7.4, M7.9)
Vehicle Applications: Late 1990s – mid 2000s BMW, Mercedes-Benz, VW/Audi, PSA, Fiat, GM Europe

Warning: Always verify with a wiring diagram for your exact year and model. The pins below are common but not universal.

| Symptom | Check pin(s) | Typical cause | |------------------------------|----------------------------------|--------------------------------| | No start, fuel pump inactive | 52, 37, 61 | Main relay or ECU ground (1,2) | | No rpm signal, no spark | 32 (CKP) – shield to pin 1 | Broken sensor wire, air gap | | Rough idle, no IAC control | 35, 36 | IAC valve open circuit | | Communication fail (scanner) | 68, 59, ECU power | Broken K‑Line, short to battery| | Immobilizer active (light on)| 46 | EWS‑ECU data line open |