On the ECU casing, pins are numbered sequentially from per connector. Pin 1 is usually indicated by a small triangle or indentation.
The M7.9.7 is one of the most common variants, typically featuring an 81-pin black connector. Pin Number Description Ignition Control Controls ignition for specific cylinders Permanent Power Permanent +12V battery supply Ignition Switched +12V from the ignition switch Main Relay Output control for the main relay Crankshaft Sensor Inputs for the VR (Variable Reluctance) sensor Throttle Signal Input from the accelerator/throttle potentiometer Power supply for MAP and TPS sensors ECU system ground Serial communication for diagnostics and tuning Interesting Technical Piece: The "Bootstrap" Mode Bosch M7 Ecu Pinout
The Bosch M7 is heavily integrated with the BSI (Body Systems Interface) in PSA cars. If you swap an ECU from a donor car, the car will crank but not start (or start for 1 second and cut). On the ECU casing, pins are numbered sequentially
| Pin | Sensor | Signal Type | Notes | |-----|--------------------------|----------------------|-----------------------------| | 32 | Crankshaft position (CKP)| Variable reluctance | 58‑2 or 60‑2 tooth wheel | | 44 | Camshaft position (CMP) | Hall effect | Synchronization | | 17 | Manifold absolute pressure (MAP) | 0–5V analog | Optional – some use MAF only | | 12 | Mass air flow (MAF) | 0–5V or frequency | Hot-film | | 11 | Intake air temp (IAT) | NTC thermistor | 2.5kΩ @ 20°C | | 13 | Engine coolant temp (ECT)| NTC thermistor | 2.5kΩ @ 20°C | | 29 | Throttle position (TPS) | 0–5V dual track | Redundant for E-gas | | 21 | Oxygen sensor 1 (pre‑cat)| 0–1V (narrowband) | Titania or zirconia | | 22 | Oxygen sensor 2 (post‑cat)| 0–1V | Catalyst monitor | | 8 | Knock sensor 1 | Piezoelectric | Shielded cable | | 9 | Knock sensor 2 | Piezoelectric | Shielded cable | | 51 | Vehicle speed (VSS) | Square wave (0–12V) | From ABS or transmission | On the ECU casing