DOWEL-HOLLOW 4N0898 - Caterpillar

Probable Causes
Pressure switch at the inlet of the jacket water coolant pump
Inlet pressure of the jacket water coolant pumpRecommended Actions
Pressure Switch at the Inlet of the Jacket Water Coolant Pump
The circuit for the pressure switch must remain closed in order to avoid a E224 High Jacket Water Inlet Pressure from occurring. Check wiring for damage and corrosion. Refer to Troubleshooting, "Inspecting Electrical Connectors".If a problem with the wiring for the circuit is found, repair the wiring, as needed.Inlet Pressure of the Jacket Water Coolant Pump
The pressure switch at the inlet of the jacket water coolant pump will trip when a pressure of 462 41 kPa (67 6 psi) is present. This will effectively create an open in the circuit for the switch. Measure the resistance between terminal A and terminal B at the switch. Use a pressure gauge to confirm the pressure at the inlet of the jacket water coolant pump.If the pressure is less than 462 41 kPa (67 6 psi) but the E224 High Jacket Water Inlet Pressure is occurring, replace the pressure switch at the inlet of the jacket water coolant pump.If a pressure of at least 462 41 kPa (67 6 psi) is measured at the inlet of the jacket water coolant pump, the high pressure may be caused by a restriction in the jacket water system. Inspect the system for restrictions. Make repairs, as needed.Note: If the outlet pressure of the coolant is greater than approximately 444 kPa (64 psi), a 109-08 Engine Coolant Outlet Pressure Sensor abnormal frequency, pulse width, or period may be generated. This code may be generated although there is no malfunction in the electrical circuit. If this code is generated, verify the actual outlet pressure of the coolant with a pressure gauge. If the actual pressure is greater than approximately 444 kPa (64 psi), reduce the pressure. This will prevent a false 109-08 Engine Coolant Outlet Pressure Sensor abnormal frequency, pulse width, or period from being activated.