HOUSING-COMPRESSOR 6N0579 - Caterpillar

System Operation Description:The overspeed verify switch provides a way to check the system at 75 percent of the set point. The set point is 118 percent over the rated engine rpm. When the engine reaches the set point, the strategy for the overspeed is initiated. This action will test the shutoff system. The overspeed verify switch allows you to verify proper operation of the system. This feature is disabled if "Overspeed Shutdown" is programmed to OFF.
Illustration 1 g01068183
Test Step 1. Inspect Electrical Connectors and Wiring
Verify that there are no tripped circuit breakers.
Turn the breaker at the battery to the OFF position.
Turn the engine control switch (ECS) to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
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 of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points.Expected Result:The connectors and wiring are free of damage, of abrasion, and of pinch points. The wiring harness and wiring connectors are completely inserted and the wiring harness and wiring connectors are free of corrosion.Results:
OK - The connectors and wiring are okay. Proceed to test step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Verify that the repair has eliminated the problem. Stop.Test Step 2. Check the Switch status on Cat ET.
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the breaker at the battery to the ON position.
Select the status screen on Cat ET.
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