KIT (Includes 5 Piston rings) 8A2250 - Caterpillar

System Operation Description:This application is equipped with an emergency stop switch. The switch is located on the control panel. The Electronic Control Module (ECM) is configured to record an event when the switch is activated.The emergency stop switch provides a switch in the circuit from the +Battery to the control input for the ECM relay. The ECM relay provides the battery power for the ECM.The emergency stop switch is a normally open switch in the RUN position. The secondary contacts for the ECM relay are normally closed contacts.When the emergency stop switch is switched to the STOP position, the switch contacts for the emergency stop switch are closed. Control input voltage is supplied to the ECM relay and secondary contacts of the ECM relay are pulled open. This removes battery voltage from the ECM.
Illustration 1 g01206694
Schematic for the emergency stop switch
Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the battery disconnect switch to the OFF position.
Illustration 2 g01207034
Location of the ECM relay (typical left side engine view)
Illustration 3 g01210817
Location of the engine interface connector (typical engine view)
Thoroughly inspect the connector for relay (1) and connector (2). Also, thoroughly inspect any other connectors that are associated with the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01206959
Terminal locations at the engine interface connector that are associated with the emergency stop switch
(4) +Battery
(23) Emergency stop
Illustration 5 g01206963
Terminal locations at the connector for the emergency stop switch
(5) +Battery
(11) Emergency stop
Illustration 6 g01210818
Terminal locations at the ECM relay that are associated with the emergency stop switch
(5) Emergency stop
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the emergency stop switch.
Check the torque of the allen head screws for the engine interface connector. 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 battery to the ECM relay. 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 connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary.STOPTest Step 2. Check for Voltage at the Connector for the Emergency Stop Switch
Disconnect the connectors for the emergency stop switch.
Turn the battery disconnect switch to the ON position.
Measure the voltage between terminal 5 on the harness side of the connector for the emergency stop switch and the engine ground stud.
Turn the battery disconnect switch to the OFF position. Expected Result:The correct voltage is 24 3 VDC.Results:
OK - The voltage is 24 3 VDC. The supply voltage is reaching the connector for the emergency stop switch. There may be a problem with the emergency stop switch. Proceed to Test Step 4.
Not OK - The voltage is not 24 3 VDC. The supply voltage is not reaching the connector for the emergency stop