Massey Ferguson 974.04 – Engine Control Unit (ECU): Engine Throttle Sensor Voltage Issue / Remote Analog Throttle Signal Out of Range Low

This code is generated when the control unit measures a voltage that is below normal (typically below 0.3 volts) at the signal input of the hand throttle potentiometer or foot throttle sensor. This indicates a short to ground, an open circuit in the 5-volt supply line, or an internal failure of the potentiometer itself. When this fault is active, the engine may default to low idle speed or "limp" mode.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 5600 Series
• 5700 Series
• 5709
• 5710
• 5711
• 5712
• 5713
• 6400 Series
• 6600 Series
• 6700 Series
• 7400 Series
• 7600 Series
• 7700 Series
• 7714
• 7726S
• 8400 Series
• 8600 Series
• 8700 Series

1. 1

   Visual Inspection: Inspect the hand throttle and foot pedal assemblies for physical damage, debris, or binding.

2. 2

   Wiring & Connector Check: Inspect the wiring harness leading from the throttle potentiometer to the ECU. Look for chafed wires, pinched harnesses, or corroded connector pins.

3. 3

   Voltage Test: Using a multimeter, check the connector at the throttle sensor. Verify that the sensor is receiving a steady 5-volt reference supply from the ECU and that it has a solid ground connection.

4. 4

   Signal Test: Back-probe the signal wire while sweeping the throttle from idle to full throttle. The voltage should increase smoothly without dropping out. If the 5V supply and ground are good but the signal voltage remains near 0V, the sensor is internally faulty.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the negative battery terminal to prevent electrical spikes.

2. 2

   Access the Sensor

   Remove the interior cab trim panels necessary to access the hand throttle assembly or the foot pedal assembly (depending on which sensor is flagged/failed).

3. 3

   Disconnect and Remove

   Unplug the electrical connector from the faulty throttle potentiometer. Remove the mounting screws or retaining clips holding the sensor in place.

4. 4

   Install the New Sensor

   Mount the replacement potentiometer into the assembly and secure the fasteners. Reconnect the electrical harness, ensuring the connector clicks into place.

5. 5

   Reassemble and Reconnect

   Reinstall any removed cab trim panels and reconnect the negative battery terminal.

6. 6

   Calibration

   A new throttle potentiometer must be calibrated to the ECU so it learns the new 0% (idle) and 100% (full throttle) voltage values. Depending on the tractor series, this may require a dealer diagnostic tool (like AGCO EDT) or an in-cab calibration sequence (e.g., lifting the pedal, cycling the key, and using the Datatronic screen).

7. 7

   Test Operation

   Start the engine, clear the inactive fault codes, and verify that the throttle responds normally without throwing the 000974.04 code.