C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes.

Note: The following code may not be applicable for certain applications.

Table 1

Diagnostic Trouble Codes
J1939 Code and Description	Comments
1664-31 Engine Automatic Start Failed	An attempt from the automatic start system failed to start the engine due to an overcrank condition. The starting attempt has exceeded the time that is programmed for the “Crank Duration” parameter. Activation of this code latches an engine shutdown condition. The power to the ECM must be cycled prior to any additional attempts to start the engine. The fuel is shut off. Engine cranking is prevented.

Probable Causes

• Diagnostic Codes

• Starting Aids (if applicable)

• Load

• Fuel Supply

• Battery

• Charging Circuit

• Starter

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

Table 2

Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Establish communication between the Caterpillar Electronic Technician (ET) and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. Troubleshoot any associated diagnostic codes that are present before continuing with this procedure.	Associated Codes	Result: An associated diagnostic trouble code is not active or logged. Proceed to Test Step 2. Result: An associated code is active or logged. Repair: Troubleshoot the associated codes before continuing with this procedure. Refer to Troubleshooting, "Diagnostic Trouble Codes" in order to troubleshoot the associated diagnostic code. If the problem is not resolved, proceed to Test Step 2.
2. Starting Aids (if applicable) A. If cold ambient conditions exist, check the operation of the starting aids. B. Verify that the starting aid is operating correctly.	Starting Aids	Result: The starting aid is operating correctly. Proceed to Test Step 3. Result: The starting aid is not operating correctly. Repair: Refer to the appropriate circuit test in order to troubleshoot the starting aid. If the problem is not resolved, proceed to Test Step 3.
3. Excessive Loads A. Check for an excessive load on the engine. B. If necessary, disengage the driven equipment and test the engine.	Excessive Load	Result: The are not excessive loads on the engine. Proceed to Test Step 4. Result: The are excessive loads on the engine. Repair: Reduce the load on the engine. Return the unit to service. If the problem is not resolved, proceed to Test Step 4.
4. Inspection of the Fuel Supply A. Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only. B. Ensure that the fuel supply valve (if equipped) is in the full OPEN position. C. Check the fuel quality. Make sure that the fuel meets the requirements of Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations". D. Inspect the fuel system. Refer to Systems Operation/Testing and Adjusting, "Fuel System" for additional information. 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.	Fuel Level	Result: The fuel level is OK. Proceed to Test Step 5. Result: The fuel level is not OK. Repair: Fill the tank. If necessary, add fuel. If the engine has been run out of fuel, purge the air from the fuel system. If the problem is not resolved, proceed to Test Step 5.
5. Worn Battery A. Verify that the battery is no longer able to hold a charge. Refer to Systems Operation/Testing and Adjusting for the correct procedure.	Battery	Result: The battery will hold a charge. Proceed to Test Step 6. Result: The battery will no longer hold a charge. Repair: Replace the battery. Refer to Disassembly and Assembly for the correct procedure. If the problem is not resolved, proceed to Test Step 6.
6. Switched Battery Circuit A. Inspect the battery cables, wiring, and connections in the charging circuit. B. Verify that a switched battery circuit drained the battery by being left in the ON position. C. Charge the battery. Verify that the battery is able to maintain a charge. Refer to Systems Operation/Testing and Adjusting for the correct procedure.	Battery Circuit	Result: The battery circuit is OK. Proceed to Test Step 7. Result: The battery circuit is not OK. Repair: Clean all connections and tighten all connections. Replace any faulty parts, if necessary. If the problem is not resolved, proceed to Test Step 7.
7. Alternator A. Inspect the condition of the alternator. Refer to Troubleshooting, "Alternator Problem" for the correct procedure.	Alternator	Result: The condition of the alternator is OK. Proceed to Test Step 8. Result: The condition of the alternator is not OK. Repair: Replace or repair the alternator. If the problem is not resolved, proceed to Test Step 8.
8. Starter Engagement A. Attempt to start the engine while you observe the status of the relay for the starting motor on Caterpillar Electronic Technician.	Starter Engagement	Result: The relay for the starting motor indicates that the engine should crank and cranking occurs. Proceed to Test Step 9. Result: The relay for the starting motor indicates that the engine should crank but no cranking occurs. Repair: Troubleshoot the starting circuit. If the problem is not resolved, proceed to Test Step 9.
9. Crank Cycle A maximum of one crank cycle per overcrank is recommended. A. Make sure that the engine can be cranked for a sufficient amount of time.	Crank Cycle	Result: The engine cannot be cranked for a sufficient amount of time. Repair: Use Cat ET to check the "Cycle Crank Time" and the "Overcrank Time" parameters. Remember that the purge cycle is part of the total crank cycle. Reprogram the parameters, if necessary.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).