New Holland NH 3003 – Engine Control Unit (ECU): Accelerator Pedal Signal - SOURCE LOW

The signal voltage from the foot throttle sensor (accelerator pedal position sensor) has fallen below the minimum acceptable range. This condition is typically caused by a short circuit to ground in the sensor wiring, a loss of the 5V reference voltage, or an internal failure of the pedal's potentiometer.

• TD5 Series
• TD5.85
• T-Series Tractors
• T4000
• T5000
• T6000
• T7000
• T8000
• T9000
• TM Series
• TM140
• TM150
• TM175
• TL Series
• TLA Series
• Maxxum
• Magnum

1. 1

   Check the tractor's battery voltage, as low system voltage (especially during cold weather starts) can cause the ECU to register false Source Low codes.

2. 2

   Inspect the wiring harness and electrical connector at the accelerator pedal for chafed wires causing a short circuit to ground, corrosion, or loose pins.

3. 3

   Using a multimeter, verify the sensor is receiving its proper 5V reference voltage from the ECU.

4. 4

   Test the signal wire with a multimeter to confirm if the voltage drops below the minimum range, indicating a dead spot in the potentiometer.

1. 1

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical damage to the ECU.

2. 2

   Locate the accelerator pedal assembly on the right side of the cab floorboard.

3. 3

   Carefully depress the locking tab and disconnect the electrical wiring harness connector from the pedal's potentiometer/sensor.

4. 4

   Remove the mounting bolts securing the accelerator pedal assembly to the cab floor.

5. 5

   Remove the faulty pedal assembly.

6. 6

   Position the new OEM accelerator pedal assembly and secure it with the mounting bolts.

7. 7

   Reconnect the electrical wiring harness, ensuring it clicks securely into place.

8. 8

   Reconnect the negative battery cable.

9. 9

   Turn the key to the ON position and use a diagnostic scan tool to clear the NH 3003 fault code from the Engine ECU.

10. 10

    Start the engine and verify smooth throttle response.