Massey Ferguson 102.18 – Engine ECU: Intake Boost Pressure Sensor Signal Too Low

Measured intake manifold pressure is lower than the reference pressure expected by the engine at high load.

• 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
• 7714S
• 7719S
• 8450
• 8460
• 8470
• 8480

1. 1

   Perform a visual and mechanical inspection of the intake manifold and charge-air cooler piping for leaks, loose clamps, or cracks that could cause a genuine low boost condition

2. 2

   Ensure the air filter is not severely restricted

3. 3

   Inspect the boost pressure sensor wiring harness, connector, and contact pins for oxidation, moisture, or backed-out terminals

4. 4

   Test the sensor's operation using a multimeter, verifying the 5.0V supply voltage

5. 5

   If wiring and sensor test fine, test the system with a known-good EEM controller to rule out a defective ECU

1. 1

   System Reset

   Turn the ignition off for a minimum of 60 seconds to allow the ECU to power down completely.

2. 2

   Access the Sensor

   Locate the Intake Boost Pressure Sensor (MAP sensor) on the engine's intake manifold.

3. 3

   Clean/Repair Wiring

   If oxidation or damage was found during diagnostics, clean the connector pins with electrical contact cleaner or repair the damaged harness section.

4. 4

   Replace the Sensor

   If the sensor is deemed faulty, disconnect the electrical harness, unbolt/unscrew the old sensor, and install the new OEM replacement.

5. 5

   Clear Codes

   Turn the ignition back on. Use a diagnostic service tool to clear the stored fault codes, or run the engine to see if the ECU moves the code from "Active" to "Inactive" after detecting the proper pressure reference.