The ECM detects all of the following conditions:
3176C and 3196 Engines
- The engine has been running more than three minutes. This three minute delay begins once the engine speed is within 50 rpm of the low idle setting.
- Engine coolant temperature is greater than 102 °C (216 °F) for more than four seconds.
- 110-03 Engine Coolant Temperature open/short to +batt is not active.
- 110-04 Engine Coolant Temperature short to ground is not active.
3406E Engine
- The engine has been running more than 60 seconds.
- Engine coolant temperature is greater than 102 °C (216 °F) for more than four 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 diagnostic event. The ECM will derate the engine power by 12.5 percent for each degree celsius above 102 °C (216 °F). The maximum derate is 50 percent of full power. The ECM will restore full engine power when the engine coolant temperature falls to 100 °C (212 °F) for 20 seconds.
- 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 ET 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 - Proceed to Test Step 2.
- Not OK -
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 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: Monitor the operation of the engine.Repair the problem.Ensure that the repair eliminates the problem.
STOP
- Not OK -
Repair: Repair the problem.Ensure that the repair eliminates the problem.
STOP