Case IH 3 – Electronic Instrument Cluster (EIC): Fuel tank level sender short to ground

Non-Critical electrical fault. The controller is receiving a near-zero voltage signal from the fuel level sender circuit, indicating that the signal wire is shorting directly to the chassis ground or the sender itself has failed internally.

• MXM
• MXM Series
• Puma Series
• Maxxum Series
• CX Series

1. 1

   Inspect the fuel level sender on the fuel tank. Check if the connectors on the terminals are clean and tight.

2. 2

   Disconnect the wires from the sender unit to isolate the short. If the fault code changes (e.g., to Code 4: Open Circuit), the short is likely internal to the sender unit.

3. 3

   If the short to ground persists with the sender unplugged, trace the wiring in the engine/chassis harness back to the instrument cluster to look for rubbed, pinched, or bare wires.

1. 1

   Turn off the tractor and locate the fuel tank level sender unit.

   Located on the top or side of the fuel tank.

2. 2

   Disconnect the electrical harness from the sender unit.

3. 3

   Clean the terminal connections thoroughly.

   Remove any dirt, corrosion, or debris.

4. 4

   Trace and repair any damaged wiring in the harness.

   Perform this if a short to ground was found during the diagnostic phase.

5. 5

   Remove the mounting screws/lock ring holding the sender to the tank.

   Perform this if the wiring is intact but the sender is internally shorted.

6. 6

   Remove the old sender unit and install the replacement fuel tank level sender.

7. 7

   Reconnect the electrical harness and turn the key on.

   Verify that Fault Code 3 has cleared and the fuel gauge reads accurately.