Massey Ferguson 723.31 – Engine Control Unit (ECU): Camshaft Speed Sensor Signal Missing. (ECU)

This code indicates that the Engine Control Unit is no longer receiving the rotational speed and position signal from the camshaft speed sensor. Without this signal, the engine management system cannot properly synchronize fuel injection timing, ignition timing, or emissions controls, which can lead to rough idling, misfires, hesitation, or a no-start condition.

• 4710
• 7724S
• 5712SL
• Interim Tier 4 (2012-2015)
• 7722
• 7722S
• 7615
• 5613
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7616
• 7618
• 5608
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 5711SL
• 7614
• 7718S
• 5610
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 5612
• 7622
• 7720
• Tier 4 (2015-2021)
• 5611
• 7715S
• 5609
• 7724
• 6400 Series
• 7400 Series
• 8400 Series
• 7256

1. 1

   Use Massey Ferguson's Wintest diagnostic software to monitor the sensor's live data feed to the ECU to confirm the signal is genuinely missing

2. 2

   Inspect the wiring harness leading to the camshaft sensor for chafed wires, melted insulation, or a damaged connector

3. 3

   Disconnect the sensor and check for moisture, dirt, or corrosion inside the electrical connector, which can block the 5V/12V reference signal

4. 4

   Ensure the sensor is mounted securely and verify the air gap between the sensor and the camshaft reluctor wheel is not too large

1. 1

   Preparation

   Allow the engine to cool down completely before beginning work. Disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Sensor

   The camshaft speed sensor is typically located on the cylinder head, near the timing cover, or integrated into the valve cover (exact location varies slightly depending on the specific AGCO Power engine model).

3. 3

   Removal

   Disconnect the standard Massey Ferguson electrical connector from the sensor. Remove the mounting bolt(s) securing the sensor to the engine block/head.

4. 4

   Cleaning

   Thoroughly clean the mounting area to ensure no dirt or debris falls into the engine and that the new sensor will seat perfectly flat.

5. 5

   Installation

   Insert the new camshaft speed sensor. Verify that the air gap is correct (if adjustable on your specific engine). Tighten the mounting bolt(s) to OEM torque specs.

6. 6

   Reconnection

   Reconnect the electrical connector, ensuring the weather seal clicks firmly into place to lock out moisture.

7. 7

   Clear Codes

   Reconnect the battery, turn on the ignition, and use a diagnostic tool to clear the 000723.31 fault code from the ECU. Start the engine to verify the repair.