3516B and 3516C Engines For MT4400D AC Off-Highway Trucks Caterpillar

Use this procedure in order to troubleshoot an unexpected engine shutdown or use this procedure if one of the following diagnostic codes is logged.

Table 1

Event Codes
Event Code and Description	Conditions which Generate this Code	System Response
E265(1) User Defined Shutdown - least severe	The user-defined shutdown switch has been activated.	The code is logged. The engine is shut down.
E678(2) Ground Level Shutdown - moderate severity	The inputs from the ground level shutdown switch to the Electronic Control Module (ECM) have changed states.	The code is logged. The engine is shut down.
4215-31 Ground Level Shutdown - Activated	The ground level shutdown has been activated.	The code is logged. The engine is shut down.

Probable Causes

• Diagnostic codes

• Engine shutdown using the customer stop switch

• Electronic unit injectors

• Engine shutdown using the emergency stop switch at the control panel

• Faulty circuit for the emergency stop switch or the customer stop switch

• Fuel supply

Recommended Actions

Table 2

Troubleshooting Test Steps	Values	Results
1. Activated Shutdown A. Interview the operator and determine the reason for the shutdown.	Operator	Result: The shutdown was intentional. Ensure that the reason for the shutdown has been corrected. Reset the control system. Resume normal operation. Result: The stop was accidental. Reset the control system. Resume normal operation. Result: The emergency stop shutdown was activated. Reset the shutdown switch. Confirm that the condition for the emergency stop shutdown has been resolved. Cycle the keyswitch in order to reset the control system. Result: The emergency stop shutdown was not activated. Proceed to Test Step 2.
2. Diagnostic Codes A. Establish communication with Cat ET. Refer to Troubleshooting, "Electronic Service Tools". B. Check for active codes on Cat ET.	Codes	Result: There are active codes. Troubleshoot any active codes before continuing with this procedure. Result: There are no active codes. Proceed to Test Step 3.
3. Check the Circuit for the Stop Switches A. Inspect the wiring between the switches and the connector of the ECM. B. Look for damage and/or for corrosion. Refer to Troubleshooting, "Switch Circuit - Test".	Connectors and Wiring	Result: The connectors or wires are OK. Proceed to Test Step 4. Result: The connectors or wires are Not OK. Repair: Make all necessary repairs. Verify that the repair eliminated the problem.
4. Inspect the Stop Switches A. Inspect the stop switches for evidence of damage that has been caused by vibration. B. Disassemble the switches. Inspect the components for looseness, cracks, and abrasion.	Switches	Result: The switches are OK. Proceed to Test Step 5. Result: The switches are Not OK. Repair: Make all necessary repairs. Verify that the repair eliminated the problem.
5. Fuel Supply A. Visually check the fuel level. Do not rely on the fuel gauge only. If the engine has been run out of fuel, air must be purged from the fuel system. B. Inspect the fuel system. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for more information. C. Check the fuel tank for foreign objects which can block the fuel supply.	Supply	Result: The fuel system is OK. Proceed to Test Step 6. The fuel system is NOT OK. Repair: Make all necessary repairs. Verify that the repair eliminated the problem.
6. Electronic Unit Injectors A. Perform the "Injector Solenoid Test" in order to determine if all of the injector solenoids are being energized by the ECM. B. Perform the "Cylinder Cutout Test" in order to identify any injectors that might be misfiring.	Fuel injectors	Result: The tests were successful. Proceed to Test Step 7. Result: The tests were NOT successful. Remove the suspect injector, and install a new electronic unit injector. Refer to Disassembly and Assembly. Ensure that the repairs have determined the problem. Refer to Troubleshooting, "Injector Solenoid - Test".
7. Fuel Quality A. Obtain a fuel analysis. Cold weather adversely affects the characteristics of the fuel. Refer to Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation. B. Check the fuel for contamination.	Fuel Quality	Result: The fuel quality is OK. Proceed to Test Step 8. Result: The fuel quality is NOT OK, and/or the fuel is contaminated. Repair: Drain the fuel, and replace the fuel. Verify that the problem is resolved.
8. Mechanical Failure A. Check for a mechanical failure.	Mechanical failure	Result: A mechanical failure has occurred. Diagnose the problem and then repair the problem. Verify that the repair eliminated the problem.