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.
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Event Code | ||
---|---|---|
J1939 Code and Description | Conditions which Generate this Code | System Response |
110-17 Engine Coolant Temperature : Low - least severe (1) | The temperature of the engine coolant has fallen below the trip point for the programmed delay time. | The code is logged.
The ECM may derate the engine or shutdown the engine. |
- 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.
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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).
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