Symptom Tree t024
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334, or the Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX15 Engines, Bulletin 3666259, or the Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419 for fault code troubleshooting. |
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Coolant temperature sensor is malfunctioning |
Use an electronic service tool to check the coolant temperature sensor circuit. Refer to Procedure 019-019 in the Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334, or Procedure 019-019 in the Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX15 Engines, Bulletin 3666259, or Procedure 019-019 in the Troubleshooting and Repair Manual, PowerCommand Control Version 3200 QSX15, QSK45 and QSK60 Generator Sets, Bulletin 3666394, or Procedure 019-019 in the Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419. |
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Coolant temperature gauge is malfunctioning |
Test the temperature gauge. Repair or replace the gauge, if necessary. Refer to in the OEM service manual. |
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Engine is operating at low ambient temperature |
Check the winterfront, shutters, and under-the-hood air. Use under-the-hood intake air in cold weather. Refer to Cold Weather Operation, Bulletin 3387266 and the correct Operation and Maintenance manual. |
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Fan drive or fan controls are malfunctioning |
Check the fan drive and controls. Refer to Procedure 008-027. |
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Coolant fill line is not routed correctly |
Check the routing of the coolant fill line. Refer to the OEM service manual. |
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Radiator shutters are stuck open or opening early |
Check the shutter operation. Repair or replace the shutters if necessary. Refer to the OEM service manual and Procedure 008-049. |
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Radiator swing check valve is malfunctioning (if equipped) |
Check the swing check valve for correct operation. Refer to the OEM service manual. |
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Thermostat seal is damaged, missing, or not installed correctly |
Check the thermostat seal. Check the thermostat for correct seating. Refer to Procedure 008-013 or 008-016. |
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Thermostat is not correct or is malfunctioning |
Check the thermostat for the correct part number and for correct operation. Refer to Procedure 008-013. |
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Coolant flow through the radiator is not correct |
Check for correct coolant flow through the radiator. Refer to Procedure 008-042. |
