How to Solve AGCO Machine SPN 102 FMI 03 Boost Pressure Sensor Defect HIGH

This instruction show you guide on how to solve AGCO machine SPN102 FMI03 boost pressure sensor defect high.

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AGCO 2×4 CANUSB Interface Diagnostics

2026 AGCO EDT Electronic Diagnostic Tool

 

 

Description

The measured boost pressure signal is above the normal operating range (more than 4.7 V).

 

Failure Mode Indicator

FMI 03 – Voltage above normal or shorted to high source

 

Failure Mode

Fault code is stored and warning lamp is activated. Engine power will be reduced (FL1). CAN message indicates active fault. Engine functions dependent on the boost pressure are not active.

 

Possible Cause

• Boost pressure sensor wiring is defective
• Boost pressure sensor power supply is not correct
• Boost pressure sensor is defective
• Control unit is defective

 

Diagnosis and Solution

• Check the boost pressure sensor wiring, connectors and contact surfaces of the connector pins (possible oxidation).

 

Boost Pressure Intake Manifold Temperature Sensor

• Check the 5 V power supply to the sensor.

 

Boost Pressure Intake Manifold Temperature Sensor

• Check the boost pressure sensor operation.

 

Boost Pressure Intake Manifold Temperature Sensor

• Check the ECU operation with another EEM3 controller. If the system is functional and the fault is not active with the replacement ECU, then the original ECU is defective.

ECU Replacement

 

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