Case IH 3001 – Engine Control Module (ECM): Foot Throttle Sensor - Signal Not Plausible

The onboard computer is receiving an erratic, illogical, or out-of-bounds voltage signal from the foot throttle position sensor (accelerator pedal potentiometer) that does not align with expected operating parameters.

• Farmall
• Magnum 235
• Magnum 280
• Magnum 340 Series 4
• Magnum 380 Tier 4B CVT
• Steiger Series
• Maxxum Series
• Puma Series
• Farmall Series

1. 1

   Visual Wiring Inspection: Inspect the wiring harness connecting the foot pedal to the ECU. Look for chafing, heat damage, or broken wires.

2. 2

   Connector Check: Check the sensor's electrical connector pins for moisture, corrosion, or loose contacts, which can interrupt voltage flow and cause erratic signal readings.

3. 3

   Ground Wire Test: Test the ground wire for continuity. A broken ground wire is a common cause of fluctuating throttle output that mimics a failed ECU.

4. 4

   Voltage Tests: Check the sensor supply voltage. It should be a steady 5V reference. The system will flag errors if the supply voltage drops under 4.8V or spikes over 5.2V/5.3V for 5 seconds.

5. 5

   Voltage Tests: Check the sensor signal voltage. Ensure the signal does not drop below 200mV or exceed 5.3V when the pedal is actuated.

1. 1

   Power down the tractor and disconnect the battery

   to prevent electrical shorts.

2. 2

   Locate the foot throttle pedal assembly

   on the cab floor.

3. 3

   Carefully disconnect the electrical wiring harness connector

   from the foot throttle sensor.

4. 4

   Remove the retaining hardware (clips or bolts)

   securing the sensor to the pedal assembly/bracket.

5. 5

   Remove the faulty sensor and install the replacement part.

6. 6

   Secure the retaining hardware and reconnect the electrical harness

   ensuring it clicks firmly into place.

7. 7

   Reconnect the battery.

8. 8

   Use a compatible diagnostic scan tool (such as the CNH EASy tool or Jaltest software) to clear the 3001 fault code

   from the ECM.

9. 9

   Start the engine and test the foot pedal

   to ensure smooth RPM response without surging or dead spots.