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.
The Bosch M7 ECU pinout follows a logical but manufacturer‑specific arrangement. While many signals are consistent across M7.x variants (power, grounds, K‑Line, crank sensor), key differences exist for CAN, electronic throttle, and wideband O2. Engineers and tuners must verify pinouts against the exact hardware number (e.g., 0 261 204 172). The provided 88‑pin reference serves as a reliable starting point for diagnostics and conversion. Bosch M7 Ecu Pinout
| 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 | - | - | The Bosch M7 family (commonly found on many
| 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 | | Pin | Function | Signal Type |
Below are example pin assignments from representative M7 installations. Treat these as templates — confirm exact pin numbering/colors per part number and vehicle wiring diagram.
Example A — Common M7 variant (two 60-pin connectors A & B). Pin numbering given as A1..A60, B1..B60.
Example B — M7 on 1.8T engines (Audi/VW) — condensed common pins: