Case IH 3016 (F-174-04) – Engine Control Module (ECM / ECU): Fuel temperature sensor voltage is lower than expected

The sensor is registering a voltage drop that falls outside the normal operating parameters, often pointing to a short circuit or a failed sensor.

• VESTRUM CVX
• 240 Series Axial-Flow Combines
• Farmall 115U Tractors
• Magnum 235 - 340 (Series 4) Tractors
• STX Steiger Tractors (350 to 600 HP)
• CX series tractors
• CS series tractors
• C series tractors
• Maxxum MX series tractors

1. 1

   Check the wiring harness leading to the fuel temperature sensor for any visible damage, rubbing, or breaks.

2. 2

   Test the circuit to see if the sensor is defective or if there is a short circuit to an external source (specifically a short to ground, which causes the low voltage reading).

3. 3

   Ensure the electrical connector is securely fastened and free of corrosion or diesel fuel contamination.

1. 1

   Locate sensor

   Locate the fuel temperature sensor, which is typically mounted on the fuel rail or the injection pump housing.

2. 2

   Disconnect connector

   Disconnect the electrical connector from the sensor.

3. 3

   Remove sensor

   Unscrew and remove the old fuel temperature sensor from the housing.

4. 4

   Clean threads

   Clean the threads on the fuel rail/pump housing to ensure a proper seal.

5. 5

   Install sensor

   Install the new replacement sensor and tighten it to the specified torque.

6. 6

   Reconnect connector

   Reconnect the electrical connector, ensuring it clicks securely into place.

7. 7

   Clear fault codes

   Clear the fault codes. Note: If the Engine Controller (EDC) itself was replaced during this repair, you must follow the appropriate service tool procedure to restore self-learning parameters (Zero Fuel Calibration).