1. Disconnect the ground cable from battery.
2. Remove the generator. 
3. Drain engine coolant.
4. Disconnect the connector from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.
FUEL INJECTION (FUEL SYSTEMS)(H4DO 1.5) > Engine Coolant Temperature Sensor
1. Disconnect the ground cable from battery.
2. Remove the generator.
3. Drain engine coolant.
4. Disconnect the connector from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.