C15 – 0166-14 Rated Engine Power Special Instructions

Conditions Which Generate This Code:

The ECM detects the following conditions:
• The engine coolant temperature is at least 103 C (217.4 F) for more than eight seconds.
• The “Engine Coolant Temperature Derate Enable Status” parameter is programmed to “Enabled”.
• The engine has been running for at least three minutes.

System Response:
The ECM will limit power.
Customer passwords are required to clear this diagnostic code.

Possible Performance Effect:
The engine will be derated by 3 percent when the engine coolant temperature is 103 C (217.4 F).
The engine will be derated by 6 percent when the engine coolant temperature is 104 C (219.2 F).
Test Step 1. Check the Coolant Level
A. Turn off the engine.
B. Allow the engine to cool.
C. Check the engine coolant level. Refer to the
Operations and Maintenance Manual for more information.

Expected Result:
The engine coolant level is OK.

Results:
• OK – The engine coolant level is OK. Proceed to Test Step 2.
• Not OK – The engine coolant level is low.

Repair: Add coolant until the engine coolant level is full.

Check for coolant leaks. Repair any coolant leaks.

Check for coolant in the engine oil. Repair the cause of the leak.

Verify that the repair eliminates the problem.

STOP.

Test Step 2. Check for Airflow Restrictions
A. Check for debris in the grill and the radiator.
B. Verify that the cooling fan is operating correctly.

Expected Result:
There are no restrictions in the air flow.

Results:
• OK – There are no restrictions in the air flow.

Repair: High ambient temperatures and heavy loads could cause high coolant temperatures.

STOP.
• Not OK – There is a restriction in the air flow.

Repair: Clear the restriction or repair the cooling fan.

Verify that the repair eliminates the problem.

STOP.

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