Case IH t8F – Engine Control Module (ECM): Fuel Injection Pump Temperature, Data Incorrect

The engine control system is receiving an erratic, implausible, or incorrect signal from the fuel temperature sensor located on the fuel injection pump.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum 100
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 140
• Puma 115
• Puma 210
• CX
• CS
• C series

1. 1

   Visually inspect the fuel temperature sensor on the fuel injection pump, its 2-pin electrical connector, and the wiring harness for chafing, corrosion, or loose connections.

2. 2

   Perform a wiring continuity test between the sensor connector and the ECM, ensuring wires are not shorted to ground or to each other.

3. 3

   Test sensor resistance using a multimeter; resistance should change smoothly as the engine warms up. An open circuit or dead short indicates internal failure.

1. 1

   Preparation

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Sensor

   Find the fuel temperature sensor mounted on the fuel injection pump housing.

3. 3

   Disconnect Wiring

   Unplug the 2-pin electrical connector from the sensor.

4. 4

   Remove the Sensor

   Using an appropriately sized wrench, unscrew the sensor from the fuel injection pump. Have a shop rag ready, as a small amount of diesel fuel may leak from the port.

5. 5

   Install the New Sensor

   Clean the threads on the injection pump housing. Thread the new sensor (M14 x 1.50 metric thread) into the port and tighten it securely.

6. 6

   Reconnect

   Plug the electrical connector back into the new sensor, ensuring it clicks into place.

7. 7

   Test

   Reconnect the battery. Turn the ignition on and clear the stored fault codes via the tractor's H-Menu or diagnostic tool. Start the engine and inspect the sensor area for any fuel leaks.