BYPASS GP-COMPRESSOR 4212359 - Caterpillar

Illustration 1 g01277105
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Remove the electrical power from the ECM.
Thoroughly inspect the J1/P1 ECM connector and the connection to the user defined shutdown device (customer shutdown switch). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
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P1 ECM connector (P1-59) User defined shutdown input
Perform a 45 N (10 lb) pull test on the wire in the ECM connector that is associated with the active event code.
Check the allen head screw for each ECM connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points from the user defined shutdown device to the ECM.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.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
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 2. Check the Status of the User Defined Shutdown Input on Caterpillar Electronic Technician (ET)
Verify that the customer shutdown switch is in the OPEN position.
Connect Cat ET to the service tool connector.
Restore the electrical power to the ECM.
Observe the status of "User Shutdown" on Cat ET.
Switch the customer shutdown switch to the CLOSED position.
Observe the status of "User Shutdown" on Cat ET.
Remove the electrical power from the ECM.Expected Result:The