PANEL 3952936 - Caterpillar

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Schematic for the engine shutdown switch
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the engine ECM.
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Location of the P1 ECM connector (typical engine view)
(1) J1/P1 ECM connectors
Thoroughly inspect ECM connectors (1). Also, thoroughly inspect the connectors for the machine interface connector and the engine shutdown switch. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
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Terminal locations at the P1 ECM connector
(P1-5) Digital sensor return
(P1-40) Engine shutdown switch (N/O)
(P1-41) Engine shutdown switch (N/C)
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Harness connector for the engine shutdown switch
(Terminal 1) Engine shutdown switch (N/C)
(Terminal 2) Digital return
(Terminal 3) Engine shutdown switch (N/O)
Perform a 45 N (10 lb) pull test on each of the wires for the engine shutdown switch.
Check the torque of the allen head screw on the ECM connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points from the switch back to the ECM. Expected Result:All of the connectors, pins, and sockets are coupled and/or inserted and the harness and wiring are free of corrosion, abrasion, and pinch points.Results:
OK - The harness and the connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Status of the Shutdown Switch on Cat ET
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the status screen on Cat ET while you operate the shutdown switch. Observe the status for the shutdown switch. Note: Wait at least 30 seconds for the status of the switch to change.Expected Result:The status of the shutdown switch reads "ON" with the shutdown switch in the STOP position. The status of the shutdown switch reads "OFF" when the shutdown switch is in the RUN position.Results:
OK - The status of the shutdown switch reads "ON" with the shutdown switch in the STOP position. The status of the shutdown switch reads "OFF" when the shutdown switch is in the RUN position. The shutdown switch is operating normally.Repair: The circuit for the shutdown switch appears to be operating correctly. There may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The status of the switch does not read "ON" with the shutdown switch in the STOP position. The status of the shutdown switch does not read "OFF" when the shutdown switch is in the RUN position. There is a problem with the circuit for the shutdown switch. There may be a problem with the ECM. Proceed to Test Step 3.Test Step 3. Short the Terminals at the Harness Connector for the Shutdown Switch
Turn the keyswitch to the OFF position.
Fabricate a jumper wire that is long