Case IH 3002 (DTC 16B1) - UCM – UCM / ECU: Acceleration Pedal Position Device Driver Sensor 1 - Signal Range Check High

The control module is receiving a voltage signal from the accelerator pedal sensor that exceeds the maximum allowable threshold. This condition usually indicates a short to power in the wiring harness, a disconnected ground, or an internal failure of the sensor's potentiometer.

• MAXXUM T4E
• VESTRUM CVX
• Case IH 240 Series Axial-Flow Combines
• Case IH Magnum Tractors (235 - 340 Series 4)
• Case IH Steiger Tractors

1. 1

   Visual Inspection: Check the foot throttle pedal assembly in the cab for physical damage, debris blocking its movement, or a stuck pedal mechanism.

2. 2

   Wiring & Connector Check: Inspect the wiring harness leading from the pedal sensor to the UCM/ECU. Look for chafed wires, pinched harnesses, or corrosion inside the connector pins.

3. 3

   Voltage Test: Using a multimeter, verify that the sensor is receiving the correct reference voltage (typically 5V) and has a solid ground.

4. 4

   Signal Sweep Test: Back-probe the signal wire while slowly depressing the pedal. The voltage should sweep smoothly. If the voltage is stuck at a high value (e.g., 5V or battery voltage) regardless of pedal position, there is a short to power or the sensor has failed internally.

5. 5

   Scan Tool Verification: Use a diagnostic tool (such as the Case IH Electronic Service Tool or Jaltest) to monitor live data for the foot throttle sensor position to confirm the out-of-range reading.

1. 1

   Disconnect Power

   Disconnect the negative battery terminal to prevent electrical shorts during the repair.

2. 2

   Locate the Sensor

   Locate the accelerator pedal position sensor, which is integrated into the foot pedal assembly on the cab floor.

3. 3

   Disconnect Harness

   Carefully unplug the electrical harness connector from the sensor.

4. 4

   Remove Assembly

   Remove the mounting bolts securing the pedal assembly or the standalone sensor to the cab floor or bracket.

5. 5

   Install New Part

   Mount the new accelerator pedal position sensor or complete pedal assembly.

6. 6

   Secure

   Reinstall the mounting bolts and tighten them to OEM specifications.

7. 7

   Reconnect

   Reconnect the electrical harness connector, ensuring the locking tab clicks securely into place.

8. 8

   Restore Power

   Reconnect the negative battery terminal.

9. 9

   Calibrate/Clear Codes

   Connect a diagnostic scan tool to clear the inactive fault codes. Depending on the model, you may need to perform a pedal calibration or 'relearn' procedure via the diagnostic software so the UCM/ECU can learn the new minimum and maximum throttle voltage limits.