MANIFOLD 5S5120 - Caterpillar

Which Generate This Code:The Electronic Control Module (ECM) detects all of the following conditions:
The engine has been running for at least eight seconds.
Coolant flow is lost for at least eight seconds.
The ground level shutdown switch has not been used in order to shut down the engine.System Response:The ECM will log the warning.
None
There may be a problem with the cooling system.
There may be a problem with the coolant flow switch. Refer to the diagnostic procedure Troubleshooting, "Coolant Flow Switch" for possible causes.
There may be a problem with the ground level shutdown switch.Test Step 1. Check for "ACTIVE" Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Check for any active diagnostic codes or logged diagnostic codes.Expected Result:There are 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.STOPTest 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: Monitor the operation of the engine.If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".Ensure that the repair eliminates the problem.STOP
Not OK - Repair: Repair the problem.Ensure that the repair eliminates the problem.STOP