The Electronic Control Module (ECM) detects all of the following conditions:
- Engine coolant temperature is greater than 107 °C (225 °F) for more than 4 seconds.
- 110-03 Engine Coolant Temperature open/short to +batt is not active.
- 110-04 Engine Coolant Temperature short to ground is not active.
System Response:
The ECM will log the warning.
- Low power
- There may be a problem with the cooling system.
- There may be a problem with the coolant temperature sensor.
Test Step 1. Check for Diagnostic Codes.
- Connect the Caterpillar Electronic Technician to the service tool connector.
- Turn the keyswitch to the ON position. The engine should be OFF.
- Check for any Active Diagnostic Codes or Logged Diagnostic Codes.
Expected Result:
There should be no diagnostic codes that are present.
Results:
- OK - There are no diagnostic codes that are present. Proceed to Test Step 2.
- Not OK - There are diagnostic codes that are present.
Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual.Ensure that the repair eliminates the problem.
Stop.
Test Step 2. Perform a Check of the Cooling System.
- Perform a check of the cooling system. Refer to the diagnostic procedure Troubleshooting, "Coolant Temperature is Too High" for possible causes.
Expected Result:
There are no problems with the cooling system.
Results:
- OK - There may be an intermittent problem.
Repair: If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".
Stop.
- Not OK - A problem was found with the cooling system.
Repair: Repair the problem.Ensure that the repair eliminates the problem.
Stop.