SUPPORT 8S2924 - Caterpillar

Note: Use this procedure only if the engine does not shut down completely.Probable Causes
Check for active event codes that may derate engine power
Electrical connections not properly connected.
Check for intermittent diagnostic codes
Intermittent throttle signal
Fuel system components
Fuel supply pressure
Restriction in the air inlet and exhaust system
Excessive temperature of the turbocharger that causes the engine derate Recommended Actions
Note: If the problem only occurs under certain conditions, test the engine under those conditions. Examples of certain conditions are high engine speed, full load, and engine operating temperature. Troubleshooting the symptoms under other conditions can give misleading results.
Table 1
Troubleshooting Test Steps    Values    Results    
1. Event Codes
A. Certain event codes may derate engine power. Connect Caterpillar Electronic Technician (ET) and check for active codes and/or for logged codes.
   
Event codes    
Result: An event code is active or logged.
Troubleshoot any codes that are present before continuing with this procedure.
Result: An event code is not active or logged.
Proceed to Test Step 2.
   
2. Electrical Connections
A. Verify that the following connectors are installed correctly:
1. Electrical connectors for the ECM
2. Connectors for the wiring harness under the valve cover
3. Connectors for the engine speed/timing sensors
   
Electrical connectors    
Result: The connectors are installed correctly.
Proceed to Test Step 3.
Result: The connectors are not installed correctly.
Install the connectors correctly. Refer toTroubleshooting, "Electrical Connectors - Inspect" for the proper troubleshooting procedure.
   
3. Check for Intermittent Diagnostic Codes
A. Certain diagnostic codes may cause poor performance. Connect Cat ET and check for active codes and/or for logged codes.
   
Intermittent codes    
Result: Intermittent codes are present.
Troubleshoot any codes that are present before continuing with this procedure.
Result: Intermittent codes are not present.
Proceed to Test Step 4.
   
4. Intermittent Throttle Signal
A. Monitor the status for "Throttle Position" on Cat ET.
B. Verify that the status for "Throttle Position" is stable and that the engine is able to reach high idle speed.
Refer to Troubleshooting, "Speed Control - Test".
   
Throttle signal    
Result: The status for "Throttle Position" is stable.
Proceed to Test Step 5.
Result: The status for "Throttle Position" is not stable.
Make the necessary repairs. Refer to Troubleshooting, "Speed Control - Test".
   
5. Fuel System
A. Ensure