New Holland 3003 – ECU: Foot Throttle Position Low

The Engine Control Unit (ECU) has detected that the voltage signal from the foot throttle sensor is lower than the minimum expected value for a specified period. This condition is typically caused by a short circuit to ground in the sensor's signal wire or an internal failure within the sensor itself. The ECU interprets this low signal as an invalid throttle position, which may lead to a lack of throttle response or cause the engine to default to a preset RPM, affecting expected machine performance.

• T4 Series
• T4.75
• T5 Series
• T5.95
• T5.105
• T5.115
• TM Series
• TM115
• TM190
• T6000 Series
• T6010
• T6070
• TS Series
• TS-A Series
• TS90
• TS115A
• TL Series
• TL70
• TL100
• Genesis Series
• 8670
• 8770
• 8870
• 8970
• Compact Tractor models
• CR Series
• CX Series
• BR Series
• Roll-Belt Series
• C Series
• L Series
• C185
• L175

1. 1

   Visually inspect the wiring harness leading to the foot throttle sensor for any signs of damage, chafing, cuts, or corrosion on the connectors

2. 2

   Check for loose connections, ensuring the connector at the foot throttle sensor and at the ECU are both securely fastened

3. 3

   With the key on, check for a +5 volt reference supply between the power and ground pins at the sensor connector

4. 4

   Test the signal wire's voltage to ensure it increases smoothly as the throttle pedal is depressed

5. 5

   Perform a resistance test on the sensor (potentiometer) by measuring between pins 2 and 3 at the sensor connector. Resistance should vary between approximately 900-1000 Ω when fully depressed and 3.7 kΩ when released. Abrupt changes indicate a faulty sensor

1. 1

   Ensure safety

   Park the machine on a level surface, shut down the engine, and engage the parking brake. Disconnect the battery before working on electrical components.

2. 2

   Locate the sensor

   Find the foot throttle sensor, which is located at the base of the foot throttle pedal assembly inside the cab.

3. 3

   Disconnect and remove

   Disconnect the electrical connector from the sensor. Remove the bolts or screws securing the sensor to the pedal assembly.

4. 4

   Install new sensor

   Mount the new sensor onto the pedal assembly and tighten the fasteners to the manufacturer's specification.

5. 5

   Reconnect wiring

   Securely attach the electrical connector to the new sensor.

6. 6

   Reconnect battery and clear codes

   Reconnect the battery. Use a diagnostic tool, if available, to clear the 3003 fault code from the ECU.

7. 7

   Test operation and calibrate

   Start the machine and verify that the throttle responds correctly and the fault code does not reappear. On some models, a calibration of the new sensor may be required using a New Holland Electronic Service Tool (EST).