GASKET 7N0626 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the shutdown switch.
Illustration 1 g03845587
Table 1
Troubleshooting Test Steps Value Results
1. Inspect Electrical Connectors and Wiring.
A. Turn the engine control switch to the OFF position.
B. Thoroughly inspect the J1/P1 connector. Thoroughly inspect the J17/P17 connector. The connectors should be free of abrasions, corrosion, and pinch points. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the engine shutdown switch.
D. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect".
E. Check the harness for abrasions and for pinch points from the battery to the ECM.
Electrical connectors and wiring
Result : The electrical connectors and wiring are OK.
Proceed to Test Step 2.
Result : The electrical connectors and wiring are NTO OK.
Repair : Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Switch Status with Cat® Electronic Technician (ET).
A. Turn the engine control switch to the OFF position.
B. Connect to the service tool connector.
C. Turn the engine control switch to the ON position.
D. Toggle the engine shutdown switch. Observe the status on Cat ET.
Shutdown switch status
Result : The shutdown switch status is OK.
Repair : The shutdown input is functioning properly. Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information.
Result : The shutdown switch status is NOT OK.
Proceed to Test Step 3.
3. Short the Inputs at the Connector.
A. Turn the engine control switch to the OFF position.
B. Remove the wire from P17-14 and leave the wire disconnected.
C. Turn the engine control switch to the ON position.
D. Observe the status of the engine shutdown switch on Cat ET.
E. Turn the engine control switch to the OFF position.
F. Short the wire from P17-14 to the battery negative. Use an ohmmeter to verify the connection.
G. Observe the status of the engine shutdown switch on Cat ET.
H. Turn the engine control switch to the OFF position.
Shutdown switch status
Result : The shutdown status is OK.
Repair : The ECM and the harness are functioning properly. The customer wiring and the junction box are the source of the problem.
Result : The shutdown status is NOT OK.
Proceed to Test Step 4.
4. Short The Switch Inputs At The ECM.
A. Turn the engine control switch to the OFF position.
B. Remove the wire from P14-17 and leave the wire disconnected.
C. Turn the engine control switch to the ON position.
D. Observe status of the engine shutdown switch on Cat ET.
E. Install Deutsch connectors on a 203 mm (8 inch wire).
F. Connect the wire between P14-17 and the battery negative.
G. Observe the status of the engine shutdown switch on Cat ET.
Shutdown switch status
Result : The shutdown status switch is OK.
Repair : The ECM reads the inputs properly. There is a problem in the harness or