Engine Shutdown Occurs Intermittently
- Diagnostic codes
- Electrical connectors
- Aftermarket engine protection devices
- Fuel supply
- Fuel shutoff solenoid
- Sensor supply voltage
- Rack controls
- Engine speed sensor
- ECM or personality module
- Overspeed protection
Show/hide table
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Check for Diagnostic and/or Event Codes. A. Certain diagnostic and/or event codes may cause engine shutdown. Connect Cat® Electronic Technician (ET) and check for active and/or logged codes. |
Diagnostic or Event Codes |
Result : There are not any diagnostic and/or event codes that are present. Proceed to Test Step 2. Result : There are diagnostic and/or event codes present. Repair : Troubleshoot any codes that are present before continuing with this procedure. If the problem is not resolved, proceed to Test Step 2. |
2. Check the Electrical Connectors. A. Check for correct installation for the ECM connectors and the engine speed timing sensors. B. Inspect the battery wires from the ECM to the battery compartment. Refer to the Schematic for specific wiring information. C. Inspect the wires and connectors to all circuit protection for the engine. Check the power and ground connections to the ECM. D. Check any engine shutdown switches and associated wiring. Refer to Troubleshooting, "Electrical Power Supply - Test". |
Electrical Connectors |
Result : The electrical connectors are OK. Proceed to Test Step 3. Result : The electrical connectors are NOT OK. Repair : Refer to Troubleshooting, "Electrical Connectors - Inspect". Result : The wiring is OK. Proceed to Test Step 3. Result : The wiring is NOT OK. Repair : Repair or replace the wiring as necessary. If the problem is not resolved, proceed to Test Step 3. |
3. Check for Aftermarket Engine Protection Devices Proper Operation. A. Check any aftermarket engine protection devices for proper operation. These devices usually interrupt power to the ECM. |
Aftermarket Engine Protection Devices |
Result : The aftermarket engine protection devices are OK. Proceed to Test Step 4. Result : The aftermarket engine protection devices are NOT OK. Repair : Repair or replace the engine protection devices. If the problem is not resolved, proceed to Test Step 4. |
4. Check the Fuel Supply. A. Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only. If necessary, add fuel to the fuel tank. If the engine has been run out of fuel, it will be necessary to purge the air from the fuel system. Refer to Operation and Maintenance Manual for the correct procedure. B. Check the fuel lines for the following problems: restrictions, collapsed lines, and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines. C. Check the fuel tank for debris or foreign objects which may block the fuel supply. D. Prime the fuel system if any of the following procedures have been performed: · Replacement of the fuel filters · Service on the low-pressure fuel supply circuit Note : Check the fuel system for air. Refer to Systems Operation/Testing and Adjusting for information that is related to checking the fuel system for air. E. Check fuel quality. Cold weather adversely affects the characteristics of the fuel. Refer to the engine Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation. F. Check the filtered fuel pressure while the engine is being cranked. Refer to Systems Operation/Testing and Adjusting for the test procedure and for the correct pressure values. |
Fuel Supply |
Result : The fuel supply is OK. Proceed to Test Step 4-B. Result : The fuel level is NOT OK. Repair : Fill the fuel tank. Result : The fuel lines are OK. Proceed to Test Step 4-C. Result : The fuel lines are NOT OK. Repair : Repair or replace the fuel lines. Result : The fuel tank and/or supply is OK. Proceed to Test Step 4-D. Result : The fuel tank and/or supply is NOT OK. Repair : Remove the debris from the tank and/or fuel supply. Result : The fuel pressure is OK. Proceed to Test Step 5. Result : The fuel pressure is low. Repair : Replace the filters. Clean the fuel/water separator of any debris. Check the operation of the fuel pressure regulator valve and fuel transfer pump. If the problem is not resolved, proceed to Test Step 5. |
5. Check the fuel shutoff solenoid for proper operation. A. Refer to Troubleshooting, "Fuel Shutoff - Test" . |
Fuel Shutoff Solenoid |
Result : The fuel shutoff solenoid is OK. Proceed to Test Step 6. Result : The fuel shutoff solenoid is NOT OK. Repair : Repair or replace the fuel shutoff solenoid. If the problem is not resolved, proceed to Test Step 6. |
6. Check the Sensor Supply Voltage. A. Check for logged diagnostic codes. B. Check the following components for damage and abrasion to the power supply wires. · Rack position sensor · Engine speed sensor · ECM |
Sensor Supply Voltage |
Result : The sensor supply voltage is OK. Proceed to Test Step 7. Result : The sensor supply voltage is NOT OK. Repair : Troubleshoot any codes that are active. Repair or replace any wiring that is damaged. If the problem is not resolved, proceed to Test Step 7. |
7. Check for Proper Operation of the Rack Controls. A. Check for proper operation of the rack solenoid. B. Check for proper operation of the dynamic rack controls. C. Check for proper operation of the rack position sensor. |
Rack Controls |
Result : The rack controls are OK. Proceed to Test Step 8. Result : The rack solenoid is NOT OK. Repair : Refer to Troubleshooting, "Fuel Rack Solenoid - Test". Result : The dynamic rack controls are NOT OK. Repair : Refer to Troubleshooting, "Fuel Control - Test". Result : The rack position sensor is NOT OK. Repair : Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test". If the problem is not resolved, proceed to Test Step 8 |
8. Check the Engine Speed Sensor. A. Check that the engine speed sensor is installed correctly. B. Check that the timing wheel is installed correctly. |
Engine Speed Sensor |
Result : The engine speed sensor and timing wheel are OK. Proceed to Test Step 9. Result : The engine speed sensor and/or timing wheel is NOT OK. Repair : Refer to Troubleshooting, "Engine Speed - Test". If the problem is not resolved, proceed to Test Step 9. |
9. Check the ECM for Proper Operation and Personality Module. |
ECM |
Result : The ECM is OK. Proceed to Test Step 10. Result : The ECM is NOT OK. Repair : Refer to Troubleshooting, "ECM - Replace" for replacement. Refer to Troubleshooting, "ECM Software - Install" for troubleshooting the personality module. If the problem is not resolved, proceed to Test Step 10. |
10. Check for Proper Operation of the Overspeed Protection. A. Make sure that the engine speed switch is operating correctly. |
Overspeed Protection |
Result : The overspeed protection is NOT OK. Repair : Refer to Troubleshooting, "Overspeed - Calibrate". |
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