Massey Ferguson E 100 (4) – Engine ECU: LOW oil pressure sensor fault

The system has detected that the oil pressure sensor voltage is below normal. This typically indicates a failure within the sensor itself, a wiring issue (such as a short to ground), or a loss of signal from the sensor.

• 8600 Series
• 7600 Series
• 7614
• 7615
• 7616
• 7617
• 7618
• 5400 Series
• 6400 Series
• Dyna-4
• Dyna-6

1. 1

   Verify actual oil pressure: Connect a mechanical oil pressure gauge to the engine block to verify that the engine is actually producing adequate oil pressure. This rules out a catastrophic mechanical failure (e.g., failing oil pump).

2. 2

   Inspect the wiring harness: Check the wiring leading to the oil pressure sensor for chafing, melting, or a short to ground, as the 'voltage below normal' condition is often caused by a grounded wire.

3. 3

   Check the connector: Disconnect the sensor and inspect the pins for corrosion, moisture, or poor terminal tension.

4. 4

   Test sensor voltage: Use a multimeter to check the reference voltage at the sensor connector and the signal return to the ECU.

1. 1

   Turn off the tractor, remove the key, and allow the engine to cool.

   Ensure the machine is safely powered down before beginning work.

2. 2

   Locate the engine oil pressure sensor on the engine block.

   Location varies slightly by engine model, e.g., Sisu/AGCO Power engines.

3. 3

   Disconnect the electrical harness connector from the sensor.

   Carefully remove the connector to avoid damaging the wiring.

4. 4

   Thoroughly clean the area around the base of the sensor.

   This prevents dirt and debris from falling into the engine's oil gallery when the sensor is removed.

5. 5

   Unscrew and remove the faulty oil pressure sensor.

   Use the appropriate socket or wrench.

6. 6

   Install the new OEM oil pressure sensor.

   If the new sensor does not have pre-applied thread sealant, apply a sensor-safe thread sealant to the threads. Tighten to the manufacturer's torque specification.

7. 7

   Reconnect the electrical harness connector.

   Ensure it clicks securely into place.

8. 8

   Start the engine, check for any oil leaks around the new sensor, and verify that the E 100 (4) fault code has cleared from the display.

   Confirm the repair was successful and no leaks are present.