SEAL-O-RING 0951731 - Caterpillar

Probable Causes
The probable root causes are listed in order below:
Diagnostic codes
Battery power or ground to the ECM
Aftermarket engine protection devices
Fuel supply
Engine speed/timing sensor
ECM or personality moduleNote: Induce the engine to shut down before attempting to troubleshoot the problem.Recommended Actions
Perform the following diagnostic procedures in order:
Check for diagnostic codes.
Connect the Caterpillar Electronic Technician (Cat ET).
Check for active diagnostic codes on Cat ET.Note: Certain diagnostic codes will cause the engine to shutdown. Troubleshoot all diagnostic codes before continuing with this procedure.
Check the Battery power or ground to the ECM.
Ensure that the following connectors have been installed correctly:
J1/P1 and J2/P2 ECM connectors
J5/P5 Injector connector
J9/P9 Engine speed/timing sensor connector
If the problem occurs only after engine warm-up and the problem disappears after the engine cooldown, the circuit breakers may be tripping because of the heat. Check the circuit breakers on the vehicle in order to determine if the circuit breakers reset automatically.
Check aftermarket engine protection devices. These devices usually interrupt power to the ECM and the ECM will not communicate with Cat ET.
Check for the correct installation of the aftermarket engine protection device.
Check for the correct operation of the aftermarket engine protection device.
Verify that the ECM is receiving battery voltage.
Check the fuel supply.
Monitor the exhaust for smoke while the engine is being cranked.If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply.
Check the fuel quality.
Check the fuel pressure.
Ensure that the fuel system has been primed.
Check for fuel supply lines that are restricted.
Check the fuel filters. Refer to Testing and Adjusting for more information on the fuel system. Also refer to Truck Application and Installation Guide, LEBT5109.
If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
Check the Engine Speed/Timing Sensor.Refer to Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".
Check the ECM or the personality module.Refer to Troubleshooting, "ECM Memory - Test".