New Holland 3002 – ECU: Accelerator Pedal Potentiometer Voltage Too High

The Engine Control Unit (ECU) has detected that the voltage from the accelerator pedal (foot throttle) angle-of-rotation potentiometer is higher than the maximum expected value. This condition typically indicates an open circuit or a short to a positive voltage source in the sensor's signal wire. Because the ECU relies on this signal to determine the operator's desired engine speed, this fault compromises the tractor's speed control system. Symptoms include a lack of throttle response, the engine defaulting to a fixed RPM (such as 1500 RPM), or the engine running at full throttle.

• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• TS Series
• T4020
• T4030
• T4040
• T4050
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T6080
• T7030
• T7040
• T7050
• T7060
• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• TLA Series
• TN Series
• TSA Series
• T6
• 35
• 5635
• T5000
• TL

1. 1

   Visually inspect the wiring harness and connectors between the accelerator pedal sensor and the ECU for any visible damage, corrosion, or loose connections

2. 2

   Verify the power supply by testing for a +5V reference voltage at the sensor's connector

3. 3

   Check for a solid ground connection at the sensor's connector

4. 4

   Test the signal voltage by back-probing the signal wire at the sensor's connector; voltage should change smoothly from approximately 0.55V (pedal released) to 4.15V (pedal fully depressed). Consistently high or spiking voltage indicates a fault

5. 5

   Test sensor resistance by disconnecting it and measuring between the pins (e.g., on 160HP models, resistance between pins 2 and 3 should be 3.7 kΩ released and 900-1000 Ω depressed). Alternatively, measure resistance between the center (wiper) pin and an outside pin; resistance should change smoothly as the pedal is operated

6. 6

   If the sensor tests correctly, check the wiring harness for a short circuit to a power source

1. 1

   Confirm fault code

   Use the tractor's onboard diagnostics or a New Holland diagnostic tool to confirm that fault code 3002 is active. Note any other active codes.

2. 2

   Perform diagnostic checks

   Follow the diagnostic checks listed above to isolate the point of failure (sensor, wiring, or controller).

3. 3

   Address wiring issues

   If diagnostic checks reveal a short to power, open circuit, or corroded connector, repair or replace the damaged section of the wiring harness.

4. 4

   Replace accelerator pedal assembly

   If the sensor itself is determined to be faulty, replace the entire pedal and sensor assembly. Disconnect the electrical connector, remove the mounting bolts securing the pedal to the cab floor, install the new assembly, and reconnect the wiring.

5. 5

   Clear codes and test operation

   Use a diagnostic tool to clear the fault code from the ECU's memory. Start the tractor and operate the foot throttle to ensure it responds correctly and the fault code does not reappear.