New Holland 3002 – ECM: Accelerator Pedal Signal - Source High

The Engine Control Module (ECM) has detected a signal voltage from the accelerator pedal position sensor that exceeds the predefined upper limit. This high voltage condition is often indicative of an open circuit in the sensor's wiring. Because the ECM relies on this signal to determine the operator's desired engine speed, an invalid signal can lead to erratic engine response, high idle speed, or the engine entering a protective limp mode.

• T7
• T8
• TM Series
• TS Series
• T4000
• T6000
• T7000
• L215
• L218
• L220
• C232

1. 1

   Thoroughly inspect the wiring harness and connectors between the accelerator pedal assembly and the ECM for any signs of damage, such as frayed or broken wires, corrosion in the connectors, or loose pins.

2. 2

   Ensure the pedal assembly is not obstructed and moves freely through its full range of motion.

3. 3

   Test the 5-Volt Supply: Turn the ignition key to the 'ON' position without starting the engine. Disconnect the electrical connector at the accelerator pedal sensor. Using a multimeter set to DC voltage, connect the black probe to a good chassis ground and probe the terminal for the 5-volt reference wire with the red probe. It should display approximately 5 volts. If 5 volts are not present, there is an issue with the wiring from the ECM or the ECM itself.

4. 4

   Test the Ground Circuit: Turn the ignition 'OFF'. Set the multimeter to continuity or resistance (Ohms). Probe the ground terminal in the sensor connector and connect the other probe to a known good chassis ground. The multimeter should indicate continuity (a beep or very low resistance). If there is no continuity, inspect the ground wire for breaks.

5. 5

   Test the Signal Circuit: Reconnect the sensor's electrical connector. Use back-probe pins to access the signal wire and ground wire from the rear of the connector. Turn the ignition 'ON'. Connect the multimeter's black probe to the ground wire and the red probe to the signal wire. With the pedal fully released (low idle), the voltage should be around 0.5 volts. Slowly and smoothly press the accelerator pedal to the fully depressed position (high idle). The voltage should increase steadily and without any jumps or dropouts to a value around 4.5 to 4.7 volts. A reading that is consistently high, does not change, or is erratic indicates a faulty sensor.

1. 1

   Repair Wiring

   If the diagnostic checks reveal any damaged wiring or corroded connectors, repair or replace the affected sections of the harness. Ensure all connections are clean and secure.

2. 2

   Replace the Accelerator Pedal Sensor/Assembly

   If the wiring is intact and the sensor fails the signal test, the accelerator pedal assembly, which contains the position sensor, must be replaced.

3. 3

   Calibration

   After replacing the sensor, a calibration or 'relearn' procedure may be necessary to ensure the ECM recognizes the new sensor's low and high idle positions. This process can sometimes be initiated by a specific sequence of key turns and pedal movements, but often requires a dealer-level Electronic Service Tool (EST).