The Alarm Code 63 in Thermo King equipment indicates an unexpected engine shutdown that powers the compressor of the refrigeration system. This issue can arise due to various causes, primarily related to the fuel injection system, engine condition, or electrical and mechanical components. Below are the possible solutions and steps to address this alarm.
Main Causes of Alarm 63
- Engine Overheating:
Excessive heat can cause the fuel to evaporate, interrupting proper injection. It is crucial to allow the engine to cool down before performing inspections or tests. - Fuel Supply Issues:
- Empty or clogged fuel filters.
- Faulty diesel pump.
- Low fuel level.
- Restrictions in the Air Intake System:
- Clogged air filter.
- Blockages in the intake hoses.
- Electrical and Sensor Failures:
- Faulty fuel level sensor.
- Voltage supply or electrical connection issues.
- Engine RPM not properly detected.
- Mechanical Components Blocked:
- Compressor or internal parts stuck.
Steps to Resolve Alarm 63
Before You Begin
- Set the power switch to the OFF position to avoid accidents.
- Ensure the engine is cool before starting inspections.
Initial Inspections
- Check Fuel Filters:
Confirm that they are not empty or clogged. - Inspect Fuel Level and Pump:
Ensure the tank has enough diesel and that the pump is functioning correctly. - Air Intake System Inspection:
Verify that the air filter and intake hoses are not obstructed. - Fuel Level Sensor:
- Check the connector and pins for physical damage.
- Use a multimeter to verify the 12V power supply between the positive and negative terminals.
- Fuel Cut-Off Solenoid:
Ensure the solenoid is not blocking the fuel flow.
Electrical Check
- Fuses and Relays:
Inspect their condition and replace them if necessary. - RPM Sensor:
Verify that the sensor is sending signals correctly. - Battery Voltage:
Confirm that the voltage is not too low, as this can impact the system. - Ground Connections:
Ensure all connections on the master ground plate are secure and free of corrosion.
Mechanical Inspection
- Compressor and Motor:
Check for stuck parts or internal blockages.
What to Do If the Cause Is Not Found
- Analyze Recorded Data:
Download and review service logs to identify operating conditions when the failure occurred. - Perform a Pre-Trip Test:
Use the system’s test mode to simulate operating conditions and detect potential issues. - Check for Other Active Alarms:
Alarm 63 may be related to other fault codes.
