Kubota standby generator displays E16 and shuts down; controller log indicates 'Sensor Supply Fault' or 'Analog Input Error'.

Safety first: Turn OFF the generator and disconnect battery negative before testing sensor circuits.

• Identify affected sensors: Refer to the Kubota wiring diagram to see which sensors share the same supply (5 V or 8 V). Common ones include oil pressure, coolant temperature, and fuel level.
• Unplug sensors one by one: Reconnect battery and power the controller (without starting). Measure the sensor supply voltage. Unplug each sensor in turn; if voltage returns to normal after unplugging a specific sensor, that sensor is likely shorted.
• Inspect harness: If unplugging sensors does not restore voltage, inspect the harness for pinched or rubbed-through wires that may be shorting to ground.
• Replace faulty sensor: Install a genuine Kubota sensor with the correct resistance range. Avoid generic sensors that may overload the supply.
• Controller check: If the supply remains low or absent with all sensors disconnected and wiring intact, the controller's internal regulator may be damaged and the controller will need replacement.