Used for diagnostics, data logging, and flashing/remapping the ECU.
| Pin Number | Pin Name | Function | | --- | --- | --- | | 1 | BAT | Battery voltage | | 2 | IG_SW | Ignition switch | | 3 | GND | Ground | | 4 | CKP | Crankshaft position sensor | | 5 | CMP | Camshaft position sensor | | 6 | CTS | Coolant temperature sensor | | ... | ... | ... | | 20 | FLI | Fuel level sensor | | 21 | TPS | Throttle position sensor | | ... | ... | ... | | 40 | INJ1 | Fuel injector 1 | | 41 | INJ2 | Fuel injector 2 | | ... | ... | ... | | 60 | CAN_H | CAN bus high | | 61 | CAN_L | CAN bus low |
: Distributed across multiple logic, sensor, and high-current driver grounds to mitigate electrical noise. Bosch M7 Ecu Pinout
| Test | Procedure | |------|------------| | | Key ON: A27=12V, A26=12V. Ground A3/A4 <0.2V to battery negative. | | Main relay test | With key ON, B27 should be 0V (relay energized). | | Crank no-start | Check A12/A13 (RPM sensor): should show 200-500mV AC while cranking. | | Lost communication | Measure resistance between B25 & B26: should be 60Ω (with other CAN nodes) or 120Ω (ECU alone). | | K-Line activity | Connect oscilloscope to B18 – should toggle 0-12V during diagnostic request. |
Comprehensive 81-contact list at Scribd - M7.9.7 Pinout . Typical modifications involve:
Wakes up the main processor when the key is turned to the "ON" position.
Note: On M7.9.x, the T81 often handles high-current loads like fuel pump relays. Ground A3/A4 <
For tuners, the Bosch M7 pinout is essential when installing a (e.g., Unichip, E-Manage). Typical modifications involve: