Coolant Temperature Is Low
Use this procedure in order to troubleshoot a low coolant temperature. Or, use this procedure if one of the following event codes is active.
Show/hide table
Diagnostic trouble Codes | |||
---|---|---|---|
J1939 Code | CDL Code | Code Description | System Response |
110-17 | E199(1) | Engine Coolant Temperature : Low - least severe (1) | The code is logged.
The ECM may derate the engine or shutdown the engine. |
110-18 | E199(2) | Engine Coolant Temperature : Low - moderate severity (2) | |
110-1 | E199(3) | Engine Coolant Temperature : Low - most severe (3) |
- Ambient temperatures (if applicable)
- Loads (if applicable)
- Engine speed
- Cooling fan (if applicable)
- Water temperature regulator
- Auxiliary coolant heater (if equipped)
- Temperature sensor
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Show/hide table
Troubleshooting Test Steps | Values | Results |
1. Extreme Ambient Temperatures (if applicable) A. Extreme ambient temperature can cause overcooling. |
Extreme ambient temperatures |
Result: Ambient temperatures are extreme. Repair: Install winter covers. Verify that the repair eliminates the problem. Result: Ambient temperatures are not extreme. Proceed to Test Step 2. |
2. Load Factor (if applicable) A. Light loads can cause overcooling. This overcooling is caused by the low heat input of the engine. |
Light loads |
Result: Engine is operating under a light load. Repair: Increase load factor if possible. Verify that the repair eliminates the problem. Result: Engine is not operating under a light load. Proceed to Test Step 3. |
3. Low Engine Speed A. Low engine speed can cause overcooling. |
Low engine speed |
Result: Engine is running at a low speed. Repair: Increase engine speed if possible. Verify that the repair eliminates the problem. Result Engine is not running at a low speed. Proceed to Test Step 4. |
4. The Cooling Fan is Always On (if applicable) A. If the cooling fan is always on, overcooling can occur. |
Fan always on |
Result The cooling fan is always on. Repair: Resolve the issue. Verify that the repair eliminates the problem. Result The cooling fan is not always on. Proceed to Test Step 5. |
5. Water Temperature Regulator A regulator that is stuck open can cause overcooling. A. Test the water temperature regulator according to Testing and Adjusting, "Water Temperature Regulator - Test". B. Make sure that the proper water temperature regulator is installed. Refer to the Specifications manual for the correct water temperature regulator. |
Water temperature regulator |
Result The regulator is stuck open or not installed. Repair: Replace the regulator. Verify that the repair eliminates the problem. Result The regulator not is stuck open is installed. Proceed to Test Step 6. |
6. Auxiliary Coolant Heater (if equipped) A malfunctioning auxiliary coolant heater can cause low coolant temperature. A. Determine if the engine is equipped with an auxiliary coolant heater. B. Check the heater for proper operation. |
Auxiliary coolant heater |
Result The coolant heater is not operating properly. Repair: Replace the heater. Verify that the repair eliminates the problem. Result The coolant heater is working properly. Proceed to Test Step 7. |
7. Faulty Coolant Temperature Sensor and/or Circuit A. Check the reading of the coolant temperature on the Cat ET. The temperature should rise steadily as the engine is warmed. Ensure that the temperature is reasonable. |
Faulty sensor or circuit |
Result The coolant temperature is not reasonable. Repair: Troubleshoot the circuit and the coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test". Verify that the repair eliminates the problem. Result The coolant temperature is reasonable. STOP |
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).
Caterpillar Information System:
XQC1600 Power Module General Maintenance Information
3512C HD and 3516C HD IPP Rental Power Modules Coolant Temperature Is High
G3306B Generator Sets Manual Stop Procedure
3512C HD and 3516C HD IPP Rental Power Modules Coolant Level Is Low
390F Excavator Machine Systems Stick - Remove and Install
C9 Engine For Caterpillar Built Machines Turbocharger - Disassemble
XQC1600 Power Module Starting the Engine
390F Excavator Machine Systems Stick Cylinder - Remove and Install
3512C and 3516C Marine Auxiliary and Generator Set Engines Fluid Recommendations
390F Excavator Machine Systems Drift Reduction Valve (Stick) - Assemble
3512C and 3516C Marine Auxiliary and Generator Set Engines Starting the Engine - Natural Gas
390F Excavator Machine Systems Drift Reduction Valve (Stick) - Disassemble
390F Excavator Machine Systems Bucket Cylinder - Remove and Install
G3306B Generator Sets Control Panel - Inspect/Test
G3306B Generator Sets Gas Pressure Regulator - Test
C4.4 Engines for Caterpillar Built Machines Gear Group (Front) - Remove and Install
3512C HD and 3516C HD IPP Rental Power Modules Crankcase Pressure Is High
G3306B Generator Sets Generator - Dry
C9 Engine For Caterpillar Built Machines Turbocharger - Assemble
G3306B Generator Sets Generator Bearing Temperature - Test/Record
2014/12/12 A New Turbine Outlet Bellows Assembly Is Used On Certain 3500 Commercial Engines {1061, 1065}
G3306B Generator Sets Electronic Modular Control Panel 4 (EMCP 4) - EMCP 4.4
C175-16 Petroleum Generator Set Engines Engine Air Cleaner Element - Replace
C175-16 Marine Engines Thermostatic Valve - Inspect