Probable Causes
• Low Coolant Level and/or Coolant Leakage
• Coolant level sensor
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
Table 25
Troubleshooting Test Steps
Values Results
1. Low Coolant Level and/or Coolant Leakage
A. Inspect the coolant level.
Coolant level Result: The engine coolant level is OK.
Proceed to Test Step 2.
Result: The engine coolant level is not OK.
Repair: Troubleshoot the cause of the incorrect coolant
level.
Check for the correct mixture of antifreeze and water. Refer
to Operation and Maintenance Manual.
Check the cooling system for leaks. Refer to Systems Oper-
ation, Testing and Adjusting, “Cooling System - Test” for the
correct procedure. Repair any leaks immediately.
Check the NRS cooler for leaks. Refer to Testing and Adjust-
ing, “Exhaust Cooler (NRS) - Test”.
Check for air in the cooling system. Refer to Systems Opera-
tion, Testing and Adjusting, “Testing the Cooling System” for
the correct procedure.
2. Faulty Sensor
A. If an electrical fault with the coolant level sensor is suspected,
refer to Troubleshooting, “Coolant Level - Test” for information on
troubleshooting the coolant level sensor.
Coolant level
sensor
Result: The coolant level sensor is not operating correctly.
Repair: Replace the coolant level sensor.
Result: The coolant level sensor is operating correctly.
Contact the Dealer Solutions Network (DSN).
i06152526
Coolant Temperature Is High
Use this procedure in order to troubleshoot high
coolant temperature or use this procedure if one of
the following event codes is active. Refer to
Troubleshooting, “Event Codes” for information about
event codes. Use the electronic service tool in order
to view the current trip points for these codes.
UENR4469-36 85
Symptom Troubleshooting
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