Overview

Engine Fuel Temperature Sensor 1 Circuit - Power Generation

Engines

Engine Fuel Temperature Sensor 1 Circuit - Marine En

Circuit Description

The engine fuel temperature sensor 1 is used by the ECM to monitor the temperature of the fuel. The fuel temperature is used by the ECM for the engine protection system, timing, and fueling control. The ECM monitors the voltage the sensor signal pin. The ECM expects to see the voltage vary between 0.5 and

4.5 volt. If the voltage is below 0.21 volt, then the ECM will log Fault Code 265. Voltage below 0.21 volt on the sensor SIGNAL pin can be caused by shorts to

ground on the SUPPLY or RETURN wires or an internally grounded, damaged sensor.

Component Location

The engine fuel temperature sensor 1 is located on the left side of the engine, on the fuel filter head. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E.

Shop Talk

All temperature sensors:

• The resistance of the sensor varies with the temperature. The reading that you observe could possibly compare to the following table if the sensor is functioning properly.

Refer to Troubleshooting Fault Code t05-265.

Last Modified: 29-Nov-2012

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