The Electronic Control Module (ECM) detects the following condition:
- Coolant level is low.
- The engine has been running for more than 30 seconds. This 30 second delay begins once the engine speed is greater than zero rpm.
- The parameter for "Coolant Level Sensor" is programmed to "Installed".
- The monitoring system parameter for "Low Coolant Level Warning" is enabled.
System Response:
The ECM will log the warning. The warning lamp will come on and the warning will be transmitted to the display. The ECM will reset the warning when there is a proper coolant level for 30 seconds.
- Low power
- The coolant level is most likely low.
- There may be a problem with the coolant level sensor.
Test Step 1. Check the Coolant Level
- Stop the engine.
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Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure. |
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- After allowing the engine to cool, check the coolant level. Refer to the Operation and Maintenance Manual for the proper procedure.
Note: The coolant level sensor should be completely immersed in coolant.
Expected Result:
The coolant is at the proper level.
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.
Test Step 2. Check the Coolant Level Sensor
- Check the coolant level sensor and the wiring to the sensor. Refer to Troubleshooting, "Coolant Level Sensor Circuit - Test".
Expected Result:
The coolant level sensor is OK.
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.