Intermittent Engine Shutdown
Note: Use this procedure only if the engine shuts down completely and the engine must be restarted.
- Active engine shutdown
- Electrical connectors
- Engine speed/timing signal
- Fuel supply
- Spark plug
Use the Digital Diagnostic Tool (DDT) or the Caterpillar Electronic Technician (ET) to check for any diagnostic codes. Determine the reason for the shutdown. After correcting the problem, set the engine control to the OFF/RESET mode for at least 15 seconds before you try to restart the engine.
- Check the wiring harnesses and the connectors. Inspect the connectors in the terminal boxes. Inspect the power supply connections and the ground. Refer to Troubleshooting, "Inspecting Electrical Connectors".
- Use the DDT or the Cat ET to check for the 168-02 System Voltage Intermittent. If this diagnostic code is present, proceed to Troubleshooting, "Electrical Power Supply".
- Inspect the wiring from the power supply to the engine terminal box. Inspect the wiring from the engine terminal box to the electronic control modules. Check the power and ground connections at each electronic control module. Refer to Troubleshooting, "Electrical Power Supply" for more information.
Loss of the signal from the speed/timing sensor will cause a shutdown. Use the DDT or the Cat ET to check for logged diagnostic codes. For more information, refer to Troubleshooting, "Engine Speed/Timing Sensor".
- Check the fuel line for the following problems: restrictions, obstructions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines.
- Check the restriction of the fuel filter. If the fuel pressure is low, replace the fuel filter.
- Check the fuel quality.
- Check the fuel pressure. Refer to Systems Operation/Testing and Adjusting, "Fuel System" for the correct pressure values. If the fuel pressure is still low, check the gas regulator and the gas shutoff valve.
An engine shutdown that is due to a faulty spark plug is likely to occur when the engine is operating under a load. Refer to Troubleshooting, "Ignition Transformers Secondary Circuit and Spark Plugs".
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