GEAR-PLANETARY 2768186 - Caterpillar

Use this procedure in order to troubleshoot an engine shutdown or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. You must access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Event Code
Description Conditions which Activate the Code System Response
E264(3) Emergency Stop Activated The engine is in the run mode or the cooldown mode and an emergency stop shutdown has been initiated. The code is logged.
The engine is shut down.
E268(3) Unexpected Engine Shutdown The engine is in the run mode or the cooldown mode and the engine speed drops below the engine's postlube engine speed.
E269(3) Customer Shutdown Requested The engine is in the run mode or the cooldown mode and a customer shutdown has been initiated. The ignition is immediately terminated when an emergency stop button is pressed. Unburned gas remains in the air inlet and exhaust system.
Unburned gas in the air inlet and exhaust system may ignite when the engine is started. Personal injury and/or property damage may result.Before starting an engine that may contain unburned gas, purge the unburned gas from the air inlet and exhaust system. Refer to the topic on purging unburned gas in the "Starting the Engine" section.
Probable Causes for an E264(3) or E269(3)
Engine shutdown event
Faulty circuit for the emergency stop or the customer shutdown
Faulty shutdown switchProbable Causes for an E268(3)
Engine overload
Faulty fuel shutoff valve
Incorrect mode switch inputs
Faulty crank terminate relay
Run relay
"Crank Terminate Speed" parameter
"Cycle Crank Time" parameter
"Engine Overcrank Time" parameter
Excessive delay time for the driven equipment
High load on engine at start-upRecommended Actions for an E264(3) or E269(3) Code
Faulty Circuit for the Emergency Stop or the Customer Shutdown
Note: The circuit for the customer shutdown switch and the emergency stop circuit must remain closed in order for the engine to run.Inspect the wiring between the shutdown switches and the connector for the ECM. Look for damage and/or corrosion. Refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to inspecting electrical connectors.Perform the following procedure to check the circuits for the emergency shutdowns:
Disconnect the P1 ECM connector.
Use a multimeter to check the resistance of the circuit through the harness: For the emergency stop switch, place the switch in the RUN position. Check the resistance between terminals P1-22 and P1-31 at the connector for the ECM. Continuity must be measured for the circuit in order for the ECM to detect normal engine operation.For the customer shutdown switch, check the resistance between terminals P1-23 and P1-31 at the connector for the ECM. Continuity must be measured for the circuit in order for the ECM to detect normal engine operation.
If either of the circuits are not continuous, locate the source of the excessive resistance in the circuit. Perform the necessary repairs. Faulty Shutdown Switch
Inspect the stop switches for evidence of damage that has been caused by vibration.