The measured intake manifold pressure (signal from boost pressure sensor) is below the warning limit during engine cranking.Here is the instruction show you guide on how to solve AGCO Machine SPN 102 – FMI 31 Intake Manifold Pressure Drop Too High at Cranking error.
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Failure Mode
Fault code is stored and warning lamp is activated. CAN message indicates active fault.
NOTE: The engine may not start or starts slowly and runs badly.
Possible Cause
- Engine air supply is clogged
- Boost pressure sensor wiring is defective
- Boost pressure sensor is defective
- Control unit is defective
Diagnosis and Solution
- Check the engine air supply system completely. Refer to service instructions as necessary:
- Air filter
- Piping from air filter to turbocharger (look for obstacles in joints, bends)
- Turbocharger
- Piping from turbocharger to charge air cooler (look for obstacles in joints, bends)
- Charge air cooler
- Piping from charge air cooler to inlet manifold (look for obstacles in joints, bends)
- Check the boost pressure sensor wiring, connectors and contact surfaces of the connector pins (possible oxidation).
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
More AGCO machine repair case,please refer to AGCO Machine Repair
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