Table 28
Troubleshooting Test Steps Values Results
1. Make Sure the Engine is Correctly Equipped for Ambient
Conditions
A. Ensure that the engine is correctly equipped for the ambient
conditions.
Engine operation Result: The engine is equipped for the ambient
conditions.
Proceed to Test Step 2.
Result: The engine is not equipped for ambient
conditions.
Repair: Refer to the Operation and Maintenance Man-
ual for more information regarding equipment required
for cold-weather operation.
2. Inspect the Cooling System
A. Check the coolant level.
B. Check for signs of a coolant leak.
Note: If the coolant temperature sensor is not immersed in coolant,
a false reading can occur.
Engine coolant
level
Result: The engine coolant level is OK.
Proceed to Test Step 3.
Result: The engine coolant level is not OK.
Repair: Check the cooling system for leaks. Refer to
Troubleshooting, “Coolant Level is Low” for additional
information. Repair any leaks.
3. Faulty Coolant Temperature Sensor
A. Check the reading of the coolant temperature on the electronic
service tool. The temperature should rise steadily as the engine is
warmed. Ensure that the temperature is as expected.
Faulty coolant
temperature
sensor
Result The coolant temperature is as expected.
Repair: A failed coolant temperature sensor has been
detected. Replace the temperature sensor.
Result The coolant temperature is as expected.
Proceed to Test Step 4.
4. Check the Engine Coolant System
A. Turn the keyswitch to the OFF position.
B. Connect to the electronic service tool.
C. Start the engine.
D. Monitor the “Engine Coolant Temperature” in the status screen
Coolant
temperature
Result: The coolant temperature comes up to opera-
tional temperature.
Return the unit to service.
Result The coolant temperature does not come up to
operational levels.
Repair: Test the water temperature regulator. Refer to
Systems Operation, Testing, and Adjusting, “Water
Temperature Regulator - Test”. If the test fails, replace
the water temperature regulator. Refer to Disassembly
and Assembly, “Water Temperature Regulator - Re-
move and Install”.
If the fault is still present, contact the Dealer Solutions
Network (DSN).
90 UENR4469-36
Symptom Troubleshooting
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