These wires are used to supply a ground reference for the sensors used by the G4X ECU. As such, it is ESSENTIAL that these wires are used for all sensors that require a ground (e.g. throttle position sensor, coolant temperature sensor, etc.). Failure to do this may result in unstable sensor readings causing erratic ECU operation. Do NOT be tempted to ground sensors to the engine block.
IMPORTANT! |
Do NOT connect any green Sensor Ground Wires to the engine block or other grounded point. This will cause current from other devices to flow in the sensor ground wires and may result in unstable sensor readings. Most sensors are isolated from ground so this is usually not a problem. Pay particular attention to this point when connecting external controllers. |