Massey Ferguson 102.31 – Engine Control Unit (ECU): Intake Boost Pressure Sensor Signal Too Low (ECU)

The Engine Control Unit (ECU) has detected that the voltage signal from the intake boost pressure sensor (MAP sensor) is below the minimum specified threshold. This indicates a problem with the sensor itself, its wiring connection, or a mechanical issue in the air intake system preventing the engine from building boost pressure. If left unresolved, this fault can lead to a loss of engine power, poor fuel economy, and black smoke from the exhaust.

• 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
• 3600 Series
• 5470
• 5480
• 5700 Series
• 6460
• 6470
• 6485
• 6490
• 6495
• 6497
• 6499
• 7485
• 7490
• 7495
• 7600 Series
• 7700 Series
• 8450
• 8460
• 8470
• 8480

1. 1

   Inspect the air filter for severe blockages and check intake piping/hoses for collapses or restrictions that could cause an excessive pressure drop at cranking.

2. 2

   Inspect the intake manifold and charge air cooler piping for air leaks.

3. 3

   Inspect the wiring harness and the electrical connector at the boost pressure sensor for corrosion, loose pins, or damaged wires that could cause a low voltage signal.

4. 4

   Verify that the sensor is receiving the correct reference voltage and ground from the ECU.

1. 1

   Disconnect battery

   Turn off the tractor and disconnect the negative battery terminal.

2. 2

   Locate sensor

   Locate the intake boost pressure sensor (MAP sensor) on the engine's intake manifold.

3. 3

   Disconnect connector

   Carefully depress the locking tab and disconnect the electrical connector from the sensor.

4. 4

   Remove fasteners

   Remove the retaining fastener(s) holding the sensor to the intake manifold.

5. 5

   Remove sensor

   Pull the old sensor straight out of its mounting port.

6. 6

   Clean mounting surface

   Clean the mounting surface on the intake manifold to ensure a proper seal.

7. 7

   Install new sensor

   Insert the new boost pressure sensor and secure it with the retaining fastener(s).

8. 8

   Reconnect connector

   Reconnect the electrical connector, ensuring it clicks securely into place.

9. 9

   Reconnect battery

   Reconnect the battery terminal.

10. 10

    Clear fault code

    Use a compatible diagnostic scan tool to clear the 000102.31 fault code from the Engine ECU.

11. 11

    Verify repair

    Start the engine and verify that the code does not return during cranking or operation.