Massey Ferguson 100 – EEM: Oil Pressure Low

The Electronic Engine Management (EEM) module has detected an abnormally low voltage signal from the engine oil pressure sensor (specifically logged as variant E 100 4). This indicates a fault within the sensor's electrical circuit, such as a short to ground, an open circuit, or an internal sensor failure, rather than a confirmed mechanical low oil pressure issue.

• 134
• 154
• 164
• 174
• 184
• 194
• 1004
• 1007
• 230
• 240
• 250
• 254
• 255
• 260
• 263
• 265
• 271
• 273
• 274
• 275
• 281
• 283
• 284
• 285
• 290
• 293
• 294
• 298
• 362
• 375
• 383
• 390
• 4215
• 4220
• 4225
• 4235
• 4240
• 4245
• 4255
• 4260
• 4265
• 4270
• 4315
• 4320
• 4325
• 4335
• 4345
• 4355
• 4360
• 4365
• 4370
• 4400 Series
• 5425
• 5435
• 5445
• 5455
• 5460
• 5465
• 5470
• 5475
• 6140
• 6150
• 6160
• 6170
• 6180
• 6190
• 6235
• 6245
• 6255
• 6260
• 6265
• 6270
• 6280
• 6290
• 64 Series
• 6700 Series
• 7400 Series
• 8110
• 8120
• 8130
• 8210
• 8220
• 8600 Series
• GC1705
• GC1723E
• GC2400 Series
• MF 50
• MF 1835e
• MF135
• MF165
• MF285

1. 1

   Check engine oil level and condition using the dipstick (look for low level, incorrect grade, fuel dilution, or excessive heat)

2. 2

   Inspect the engine, oil filter housing, and oil lines for external oil leaks

3. 3

   Verify actual oil pressure using a calibrated mechanical pressure gauge to rule out a faulty electronic sensor

4. 4

   Inspect the oil filter to ensure it is not clogged and is properly installed

5. 5

   Save and erase fault codes using a diagnostic tool (like AGCO EDT) to see if the fault returns, differentiating between intermittent and persistent issues

1. 1

   Inspect Sensor Wiring and Connectors (Electrical Fault)

   Check the wiring harness leading to the oil pressure sensor for any signs of damage, chafing, or corrosion. Ensure the connector is securely attached and the pins are clean.

2. 2

   Test the Oil Pressure Sensor (Electrical Fault)

   If the wiring is intact but a mechanical gauge shows good pressure while the dash light is on, the oil pressure sensor (or switch) is likely defective.

3. 3

   Replace the Oil Pressure Sensor/Switch (Electrical Fault)

   Locate the sensor on the engine block, disconnect the electrical connector, and unscrew the old sensor (e.g., using a 27mm wrench). Install the new sensor with thread sealant if specified, do not overtighten, reconnect, and start the engine to check for leaks and verify the warning light is off.

4. 4

   Address Oil Level/Type/Filter (Mechanical Fault)

   If the oil level was low, the oil was incorrect, or the filter was clogged, rectifying these issues may resolve the problem.

5. 5

   Inspect the Oil Pressure Relief Valve (Mechanical Fault)

   Locate the valve (on the oil pump housing, under the oil filter, or on the timing gear cover). Remove for inspection and cleaning. Replace if the spring is weak or the plunger is worn.

6. 6

   Inspect the Oil Pump (Mechanical Fault)

   If other causes are ruled out, remove the oil pan to access the oil pump. Inspect the pump gears and housing for excessive wear or damage.

7. 7

   Check for Worn Engine Bearings (Mechanical Fault)

   In high-hour engines, if oil pressure is normal when cold but drops significantly as the engine warms up, inspect for worn main or rod bearings. This typically requires an engine overhaul.