SCREW 1051517 - Caterpillar

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P2 ECM connector (P2-13) Digital return (P2-66) Air shutoff
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Generator connector (Terminal 4) auxiliary power (Terminal 5) auxiliary power (Terminal 15) Digital return (Terminal 17) E-Stop 2 (Terminal 18) Keyswitch (Terminal 19) E-Stop 1 (Terminal 23) Timer/ShutdownTest Step 1. Inspect Electrical Connectors and Wiring
Turn the ECS to the OFF position. Turn the main disconnect switch to the OFF position.
Thoroughly inspect the J1/P1 ECM connector and the J2/P2 ECM connector. Inspect all of the connectors that are associated with the circuit.Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The harness and wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the wiring harness.Repair: Perform the following 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. Refer to Troubleshooting, "Electrical Connectors - Inspect".Verify that the repair eliminates the problem.STOPTest Step 2. Check for an Active Diagnostic Code
Turn the ECS to the STOP position. Turn the main disconnect switch to the ON position.
Start Cat ET.
Check for an active 337-2 diagnostic code.Expected Result:The 337-2 diagnostic code is not active. Results:
OK - The 337-2 diagnostic code is not active. Proceed to Test Step 3.
Not OK - The 337-2 diagnostic code is active.Repair: If the diagnostic code 337-2 is active, the wires between the ECM and the emergency stop switch are in opposite states. Check the wires for an open circuit.
Turn the ECS to the OFF position. Turn the main disconnect switch to the OFF position.
Disconnect the J1/P1 ECM connector.
Measure the resistance between P1-23 at ECM connector P1 and terminal 2 at the emergency stop switch.
Measure the resistance between P1-28 at ECM connector P1 and terminal 4 at the emergency stop switch.If a resistance measurement indicates an open circuit, repair the wires and/or connectors between the emergency stop switch and the ECM.STOPTest Step 3. Check the Status while the Emergency Stop Switch is Active
Turn the main disconnect switch to the ON position. Turn the ECS to the STOP position.
Start Cat ET.
Observe the status of the emergency stop switch on Cat ET.
Activate the emergency stop switch. If multiple emergency stop switches have been installed, ensure that any other emergency stop switch has not been activated.Expected Result:The status for the emergency stop switch reads "ON".Results:
OK - The status for the emergency stop switch reads "ON". Proceed to Test Step 4.
Not OK - The status for the emergency stop switch does not read "ON". Proceed to