SETSCREW-SOCKET 6V6835 - Caterpillar

System Operation Description:Switch circuits may have problems such as faulty wiring, faulty switches, or faulty connectors. Use the following diagnostic procedures in order to diagnose problems with these switch circuits and repair these switch circuits:
Maintenance clear switch
Remote shutdown switch
Prelube override switch
Event reset switch
Low Idle switch
Droop or Isochronous switchThese switches are normally open or normally closed.
Illustration 1 g01415698
Typical switch inputs and wiringTest Step 1. Check the Electrical Connectors and the Wiring
Remove the electrical power from the Electronic Control Module (ECM).
Illustration 2 g01377328
Location of the connectors that are for the switch circuits (rear engine view) (1) J1/P1 ECM connectors (2) Customer connector
Thoroughly inspect connectors (1) and (2). Thoroughly inspect the connections for the suspect switch. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01415798
Terminal locations at the J1/P1 ECM connectors that are for the switch circuits (P1-22) Remote shutdown switch (P1-23) Maintenance clear switch (P1-54) Prelube override switch (P1-56) Event reset switch (P1-58) Low idle switch (P1-60) Droop or Isochronous switch
Illustration 4 g01415786
Terminals at the customer connector that are for the switch circuits (P1-36) Remote shutdown switch (P1-39) Maintenance clear switch (P1-68) Event reset switch (P1-69) Low idle switch (P1-70) Droop or Isochronous switch
Illustration 5 g01415780
Terminals at the connector for the engine mounted control panel that are for the switch circuits (Terminal 37) Prelube override switch
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the suspect switch.
Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The wiring and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the wiring and/or a connector.Repair: Repair the wiring and/or the connector. Replace parts, if necessary. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Test the Switch for Proper Operation
Disconnect the P1 connector.
Refer to Table 1. Determine the P1 terminal for the suspect switch.
Table 1
Terminals for the Switch Inputs    
Name of the Switch     Terminal Locations at the J1/P1 ECM Connectors     Terminal Locations at the Customer Connector    
Remote engine stop switch     22     36    
Maintenance clear switch     23     39    
Event reset switch     56     68    
Low idle switch     58     69    
Droop or Isochronous switch     60     70    
Connect one lead of a multimeter to the P1 terminal for the suspect switch. Connect the other lead of the multimeter to negative ground.Note: Wiggle the harnesses during the following measurements in order to reveal any intermittent short condition.
Measure the resistance between the P1 terminal for the