C175 Tier 4 Final Engines for Off-Highway Trucks Caterpillar

The "Delayed Engine Shutdown" (DES) feature allows the engine to run after the keyswitch has been turned to the OFF position. "Delayed Engine Shutdown" (DES) allows the engine and exhaust temperatures to cool to an acceptable level prior to shutting down the engine. If the delayed engine shutdown is aborted, potential damage to the engine and/or aftertreatment system can occur. These fault codes may indicate that the engine was shutdown while the exhaust temperatures were still above the acceptable threshold.

Use this procedure to troubleshoot the following event codes.

Table 1

J1939 Codes and Description	CDL Codes and Description	Comments
N/A	E265 (1) User Defined Shutdown	The inputs from the user-defined shutdown switch to the Electronic Control Module (ECM) have changed states. The engine will shutdown. The code is logged.
N/A	E265 (2) User Defined Shutdown	The inputs from the user-defined shutdown switch to the Electronic Control Module (ECM) have changed states. The engine will shutdown. The code is logged.
N/A	E265 (3) User Defined Shutdown	The inputs from the user-defined shutdown switch to the Electronic Control Module (ECM) have changed states. The engine will shutdown. The code is logged.
N/A	E268 (3) Unexpected Engine Shutdown	The engine has stopped unexpectedly. The engine speed is 0 while the ECM is requesting engine speed.
6588-31 Operator Shutdown With High Exhaust Temperature	E1466(1) Operator Shutdown With High Exhaust Temperature	The Engine was stopped before cooling of the exhaust system could complete. Allow Delayed Engine Shutdown to complete.

Probable Causes for a E1466 or 6588-31 Code

• An operator turning the keyswitch to the fourth position or forcing a shutdown prior to DES completing

• DES may not be enabled

• Fuel ran out prior to DES completion

• Mechanical failure causing the engine to stop prior to DES completion

Probable Causes for a E265 Code

• Activated shutdown switch

• Circuit for the shutdown switch

Probable Causes for a E268 Code

• Operator caused the engine to stall

• Fuel supply

• Mechanical Failure

Table 2

Associated Diagnostic Trouble Codes

E678

4215-31

E1217

Complete the procedure in the order in which the steps are listed.

Table 3

Troubleshooting Test Steps	Values	Results
1. Determine the Code A. Establish communication between Cat® Electronic Technician (ET) and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Warranty Report" from the engine ECM before troubleshooting or clearing diagnostic trouble codes. C. Determine the event code.	Active Codes	Result: An associated code is active. Repair: Refer to Troubleshooting, "Event Codes" in order to troubleshoot the associated diagnostic code. Troubleshoot the associated code before continuing with this procedure. Result: A E265 code is active or logged. Proceed to Test Step 6. Result: A E268 (3) code is active or logged. Proceed to Test Step 3. Result: A E1466 or 6588-31 code is active or logged. Proceed to Test Step 2.
2. Delayed Engine Shutdown A. Check if "Delayed Engine Shutdown" is enabled. B. Connect to Cat ET, navigate to the "Configuration" tab in the engine ECM. Select the "Delayed Engine Shutdown" tab and check the status of the parameter.	Delayed Engine Shutdown	Result: The "Delayed Engine Shutdown" is enabled. Proceed to Test Step 3. Result: The "Delayed Engine Shutdown" is not enabled. Repair: Enable the "Delayed Engine Shutdown". Verify that enabling the "Delayed Engine Shutdown" resolved the problem. If the problem is not resolved, proceed to Test Step 3.
3. Proper Engine Operation A. Interview the operator and determine the events that caused the engine to stall. B. The delayed engine shutdown (DES) may not have completed.	Operator	Result: The operator is operating the engine correctly. Proceed to Test Step 4. Result: The operator is not operating the engine correctly. Repair: Operate the engine correctly. If the problem is not resolved, proceed to Test Step 4.
4. Fuel A. Check the engine fuel supply.	Fuel	Result: The engine is out of fuel. Repair: Supply the engine with an adequate fuel supply. Verify that the repair eliminated the problem. Result: The engine is not out of fuel. Proceed to Test Step 5.
5. Mechanical Failure A. Check for a mechanical failure.	Mechanical Failure	Result: A mechanical failure has occurred. Repair: Diagnose the problem and then repair the problem. Verify that the repair eliminated the problem. If the problem is not resolved, proceed to Test Step 6.
6. Activated Shutdown Switch A. Interview the operator and determine the reason for the emergency stop shutdown.	Switch	Result: The emergency stop shutdown was activated. Repair: Diagnose the problem and then repair the problem. Verify that the repair eliminated the problem. Result: The emergency shutdown was not activated. Proceed to Test Step 7.
7. Check the Emergency Shutdown Switch Circuit A. Inspect the stop switches for evidence of damage that has been caused by vibration, moisture, or corrosion. B. Check the circuit for the shutdown switch. Refer to Troubleshooting, "Shutdown (Ground Level) - Test".	Emergency Shutdown Switch Circuit	Result: The emergency stop shutdown switch is not operating properly or there is a problem with the emergency shutdown circuit. Repair: Repair or replace the failed component. Verify that the repair eliminated the problem.