TUBE ASSEM. 7K8649 - Caterpillar

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Schematic
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P1 ECM connector (P1-18) Common (P1-44) Coolant flow switch
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Typical location of coolant flow switch (1) Coolant flow switchTest Step 1. Verify that the Coolant Level is Correct
Ensure that the coolant level for the engine is correct. Refer to the Operation and Maintenance Manual.Expected Result:The coolant is at an acceptable level.Results:
OK - The coolant is at an acceptable level. Proceed to Test Step 2.
Not OK - The coolant is low.Repair: Diagnose the reason for a low coolant level.Refer to Systems Operation/Testing and Adjusting, "Cooling System".Verify that the repair eliminates the problem.STOPTest Step 2. Inspect Electrical Connectors and Wiring
Remove the electrical power from the ECM.
Thoroughly inspect the J1/P1 ECM connector and the connector for the coolant flow switch. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points. All connections and grounds are tight and free of corrosion.Results:
OK - The harness and wiring are OK. Proceed to Test Step 3.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 3. Check the Status of the Coolant Flow on the Caterpillar Electronic Technician (ET)
Restore the electrical power to the ECM.
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Observe the reading for coolant flow on the Cat ET.
Start the engine.
Observe the reading for coolant flow on the Cat