This guide explains how to diagnose and repair the AGCO machine SPN 100 FMI 01 oil pressure low alarm, which occurs when the measured engine oil pressure falls below the allowable limit.
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Fault Code Overview
SPN 100 – Engine Oil Pressure
FMI 01 – Below Normal Operational Range (Most Severe)
Failure Description
- The fault code is stored in the ECU
- The engine oil pressure warning lamp is activated
- The engine will shut down automatically after 30 seconds
- A CAN message indicates that engine shutdown is pending
This condition must be addressed immediately to prevent serious engine damage.
Possible Causes of SPN 100 FMI 01
Mechanical Causes
- Engine oil level is too low
- Poor oil quality or contaminated oil
- Incorrect oil grade
- Oil filter is clogged
- Oil temperature is excessively high
- Oil diluted by fuel
- Excessive bearing clearance
- Oil pressure control valve malfunction
- Excessive wear in the oil pump
- Engine idle speed is too low
Electrical Causes
- Defective oil pressure sensor
- Damaged or open-circuit oil pressure sensor wiring
- Poor connector contact or oxidation
- Defective engine control unit (ECU)
Diagnosis and Troubleshooting Steps
Step 1: Check Mechanical Conditions
Follow AGCO service instructions and inspect the engine thoroughly:
- Verify engine oil level and oil condition
- Replace clogged or contaminated oil filters
- Confirm the correct oil grade is being used
- Inspect the engine for internal mechanical wear
- Check and adjust engine idle speed if necessary
Step 2: Inspect Electrical Components
If no mechanical faults are found, inspect the electrical system:
- Check oil pressure sensor wiring for open circuits or damage
- Inspect connectors and connector pins for corrosion or oxidation
- Verify secure and clean electrical connections
Oil Pressure Sensor Testing
- Test the oil pressure sensor operation according to AGCO specifications
- Replace the sensor if output values are incorrect or unstable
ECU (Engine Control Unit) Verification
- Replace the ECU temporarily with a known-good EEM3/EEM4 controller
- If the fault does not reoccur with the replacement ECU, the original ECU is defective and must be replaced
Summary
The SPN 100 FMI 01 oil pressure low alarm is a critical fault that can cause automatic engine shutdown.
More AGCO machine repair case,please refer to AGCO Machine Repair
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