Massey Ferguson 100 – EEM: Engine Oil Pressure Sensor Fault

Indicates an issue with the Engine Oil Pressure or the Oil Pressure Sensor circuit. Depending on the specific FMI sub-code, the underlying condition can be mechanical (actual abnormal pressure) or electrical (sensor/wiring failure). The ECU stores the fault, activates the dashboard warning lamp, and will often initiate an automatic engine shutdown to prevent catastrophic engine damage.

• 5400 Series
• 5600 Series
• 5700 Series
• 6400 Series
• 6600 Series
• 6700 Series
• 7400 Series
• 7600 Series
• 7700 Series
• 8600 Series
• 8700 Series
• GC1705
• GC1710
• GC1715
• GC1720
• GC1723E
• GC1725M
• GC2300
• GC2310
• GC2400
• GC2410
• GC2600
• GC2610

1. 1

   IMMEDIATE ACTION: If a red oil pressure warning light appears with a 'STOP' indicator, shut down the engine immediately to prevent severe damage

2. 2

   Check engine oil level and condition (look for milky or foamy oil indicating coolant contamination or air in the system)

3. 3

   Verify recent service history for a potentially clogged oil filter

4. 4

   Visually inspect the oil pressure sensor, connector, and wiring harness for physical damage, corrosion, oil leaks, chafing, or loose connections

5. 5

   Perform a mechanical pressure test (Most Critical Step): Remove the electronic sensor, attach a mechanical oil pressure gauge, start the engine, and compare readings to manufacturer specifications

6. 6

   If mechanical pressure is normal, perform electrical system checks: For a switch, check for continuity between the sensor terminal and engine block (ground) with the engine off. For a variable sensor, test for correct reference voltage (often 5V), ground, and resistance. Test the wiring harness for continuity and shorts

1. 1

   Address mechanical faults

   If the mechanical pressure test reveals low oil pressure, do not run the engine. Address the root cause first, which may involve changing the oil and filter, inspecting the oil pump, or performing internal engine repairs.

2. 2

   Repair wiring harness

   If electrical tests pinpoint a faulty wire or connector, repair or replace the damaged section of the harness.

3. 3

   Replace oil pressure sensor/switch

   If the sensor is faulty, place a drain pan below it, disconnect the electrical connector, and remove the sensor (turning counter-clockwise, potentially using a 27mm socket, crow's foot, or basin wrench). Clean threads, apply thread sealant, install the new sensor by hand, and torque to spec.

4. 4

   Perform final system check

   Clear fault codes using a diagnostic tool, start the engine, verify the oil pressure warning light extinguishes, and inspect the new sensor for leaks.