| Pin(s) | Function | Spec / Notes | |--------|-------------------------------|----------------------------------| | 37 | Battery voltage (permanent) | 12V, 10A fuse (ECU main) | | 3, 62 | Main relay output control | Switched 12V after relay | | 1, 2 | ECU ground (power) | Heavy gauge to engine block | | 4, 5 | Sensor ground (analog) | Common return for sensors | | 61 | Ignition switch input (Term.15)| 12V when key ON |
If you need a vehicle-specific pinout (exact pin numbers, connector colors, and wiring diagrams) provide the ECU part number and vehicle make/model/year and I will supply the exact mapped pinout for that unit. Bosch M7 Ecu Pinout
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The Bosch M7 family (commonly found on many late-1990s to early-2000s gasoline engines) is a group of engine control units used for fuel injection, ignition timing, and emissions control. Pinouts vary by application, connector shell, and manufacturer-specific wiring harnesses. This guide provides common M7 pin assignments, typical signal descriptions, diagnostic tips, and wiring examples — assume your specific unit may differ and verify before connecting. | Pin(s) | Function | Spec / Notes
| Pin | Function | Signal Type | Notes | |------|----------|-------------|-------| | Power & Ground |||| | A27 | Battery +12V (permanent) | Power | Main supply | | A26 | Battery +12V (switched) | Power | Via main relay | | A3 | ECU Ground | Power | To engine block/chassis | | A4 | ECU Ground | Power | Second ground | | B27 | Main relay control | Output | Activates relay | | Sensors |||| | A12 | Engine speed (RPM) sensor + | Input | Inductive | | A13 | Engine speed (RPM) sensor - | Input | Inductive | | A16 | Camshaft position sensor | Input | Hall/Inductive | | A21 | Coolant temp sensor (ECT) | Input | NTC thermistor | | A22 | Intake air temp (IAT) | Input | NTC thermistor | | A24 | Throttle position (TPS) signal | Input | 0.5-4.5V | | B5 | Throttle position (TPS) ground | Sensor ground | | | B6 | Throttle position (TPS) 5V | Reference | 5V ±0.1V | | B10 | Manifold absolute pressure (MAP) | Input | 0.5-4.5V | | B12 | Knock sensor 1 | Input | Piezoelectric | | B13 | Knock sensor 2 | Input (if V6/V8) | | | B14 | Oxygen sensor (Lambda) 1 signal | Input | 0-1V (narrowband) | | B15 | Oxygen sensor ground | Sensor ground | | | B16 | Oxygen sensor heater 1 | Output | PWM | | B20 | Vehicle speed sensor (VSS) | Input | Hall/open collector | | Actuators |||| | A5 | Injector cylinder 1 | Output | Ground switching | | A6 | Injector cylinder 2 | Output | | | A7 | Injector cylinder 3 | Output | | | A8 | Injector cylinder 4 | Output | | | A9 | Injector cylinder 5 | Output (if 5/6 cyl) | | | A10 | Injector cylinder 6 | Output | | | A14 | Ignition coil 1 (output stage) | Output | IGBT control | | A15 | Ignition coil 2 | Output | | | A17 | Ignition coil 3 | Output | | | A18 | Ignition coil 4 | Output | | | A19 | Ignition coil 5 | Output | | | A20 | Ignition coil 6 | Output | | | B1 | Idle air control (IAC) - open | Output | PWM or stepper | | B2 | Idle air control (IAC) - close | Output | | | B3 | Fuel pump relay control | Output | Activates fuel pump | | B4 | A/C compressor relay | Output | | | B8 | EVAP canister purge valve | Output | PWM | | B9 | Variable valve timing (VVT) | Output | PWM (if equipped) | | B11 | EGR vacuum regulator | Output | PWM | | Communication & Diagnostics |||| | B18 | K-Line (ISO 9141-2) | Bi-directional | Diagnostic (7.5-12V) | | B19 | L-Line (optional) | Output | Some models | | B25 | CAN High (CAN H) | Bi-directional | 500 kbps typical | | B26 | CAN Low (CAN L) | Bi-directional | | | C series (often unused or manufacturer-specific) ||| | If you need a vehicle-specific pinout (exact pin