AGCO POWER EEM4 ECU Coolant Temperature Sensor: Temperature HIGH, ALARM

This guide provides instructions on how to resolve the “Temperature HIGH, ALARM” issue for the AGCO POWER EEM4 ECU coolant temperature sensor, applicable to JCB Stage V Tier 4 engines.

Description

The alarm indicates that the measured coolant temperature has exceeded the overheating alarm limit.

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Possible Causes

  • Fan belt slipping or broken: Check for wear, tension, and integrity.
  • Incomplete cooling system fill: Ensure the cooling system is fully filled with the appropriate coolant mixture.
  • Defective water pump: Inspect for proper operation and flow.
  • Clogged cooling system: Check for blockages in hoses, radiator, and other components.
  • Defective or removed thermostat: Verify the thermostat is present, functional, and properly oriented.
  • Upside-down thermostat: Ensure the thermostat is installed correctly.
  • Non-pressure-tight radiator filler cap: Check the cap for proper sealing and pressure retention.
  • Engine overload: Assess the engine load to ensure it is not being overworked.
  • Defective coolant temperature sensor wiring: Inspect wiring for damage, disconnections, or corrosion.
  • Defective coolant temperature sensor: Test and replace if necessary.

ECU Reaction

When the alarm is triggered:

  • The fault code (FC) is stored.
  • The warning lamp is activated.
  • The engine will shut down after 30 seconds.
  • A CAN message will indicate an impending shutdown.

Solution Steps

  1. Save the Error Log: Document the fault codes and any related data for future reference.
  2. Examine the Fan Belt and Tension:
    • Check for wear and proper tension.
    • Replace if damaged or worn.
  3. Examine the Coolant Level:
    • Ensure the system is fully filled.
    • Top up with the appropriate coolant if necessary.
  4. Examine the Condition of the Radiator:
    • Inspect for blockages or damage.
    • Clean or repair as needed.
  5. Examine the Mechanical Condition of the Engine:
    • Check for any mechanical issues that may cause overheating.
  6. Examine the Coolant Temperature Sensor Wiring:
    • Inspect wiring, connectors, and contact surfaces for damage or oxidation.
    • Clean or repair as necessary.
  7. Test the Coolant Temperature Sensor:
    • Replace with a known good sensor to determine if the original is defective.

For additional repair cases for JCB, refer to: JCB Trouble Repair

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