Gemini said
Safety First: Always disconnect the battery before working on your ECU to prevent electrical shorts or permanent damage to the bike's computer.
This is my own numbering and not what is on the connector or in any books etc. 1 to 21
.JPG "Yamaha YZF R125 ECU Pin out")
Number left to right in below table
Based on the detailed ECU pin-out information for the Yamaha YZF-R125 (specifically for the 5D7 model), here is the breakdown of the wiring and pin assignments.
ECU Pin-Out & Wire Color Guide
The following pin-out covers the standard Yamaha 125cc fuel-injected systems (V2/5D7 models) commonly discussed in maintenance blogs.
| Pin # | Wire Color | Function |
| 7 | Green | K-Line (Yamaha Diagnostic Tool Connector) |
| 9 | Black/White | Ground (Mass) |
| 10 | Brown | +12V Switched Power (Active when Ignition is ON) |
| 11 | Red/White | +12V Permanent Power (Standby battery current) |
| 12 | Brown/Red | +12V Power |
| 13 | Orange | Ignition Coil (Mass signal/Trigger) |
| 14 | Black/Yellow | Main Light Ground |
| 18 | Brown/White | IAT Sensor (Intake Air Temperature) |
| 19 | Pink/White | MAP Sensor (Manifold Absolute Pressure) |
| 20 | Yellow | TPS (Throttle Position Sensor) |
| 21 | Black/Blue | Sensor Ground (SGND) |
| 23 | Red | CKP Sensor (Crank Position / Pulser) |
| 24 | White | Speed Sensor Signal |
| 29 | Light Green/Black | Speedometer Output |
| 31 | Yellow/Green | BAS / Tilt Sensor (Bank Angle Sensor) |
| 32 | Grey/Red | O2 Sensor |
| 33 | Green/Red | ECT Sensor (Engine Coolant Temperature) |
| 35-37 | Blue | +5V Reference (Power for TPS/MAP/ECT sensors) |
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