C7 and C9 Industrial Engines Troubleshooting – Engine Shutdown Occurs Intermittently

A. Check the operation of the air shutoff system.

Proceed to Test Step 2.

Result: The air shutoff system is not operating properly.

Repair: Repair the air shutoff system. Refer to Troubleshooting, “Air Shutoff – Test” for troubleshooting information.

If the repair does not resolve the problem, proceed to Test Step 2.

A. Connect Cat^® Electronic Technician (ET) to the service tool connector.

B. Look for active codes that are associated with the system for the event code.

Repair: Troubleshoot any active codes before continuing with this procedure.

Result: There are no active codes.

Proceed to Test Step 3.

A. Check for the correct installation of the ECM J1/P1 and the J2/P2 connectors. Check for correct installation of the fuel injector connectors.

Repair: Repair connectors that are suspect or replace connectors that are suspect.

Perform the “Wiggle Test” on Cat ET.

Result: There are no suspect connectors.

Proceed to Test Step 4.

If there is an immediate engine shutdown, troubleshoot the electrical connectors before proceeding with this procedure.

A. Inspect the fuel system. Refer to Systems Operation/Testing and Adjusting, “Fuel System – Inspect” 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.

B. Check fuel quality. Check the fuel tank for debris or foreign objects which may block the fuel supply.

C. Check the filtered fuel pressure while the engine is being cranked.

Proceed to Test Step 5.

Result: The fuel quality is not OK.

Repair: Replace the fuel. Verify that the repair eliminated the problem.

A. Check the power and ground connections to the ECM. Refer to Troubleshooting, “Electrical Power Supply – Test”.

Proceed to Test Step 6.

Result: The electrical connections are not OK.

Repair: Repair or replace the damaged connectors.

If the repair does not eliminate the problem, proceed to Test Step 6.

A. Check the keyswitch input to the ECM.

B. Check any engine shutdown switches and associated wiring.

Proceed to Test Step 7.

Result: The shutdown switches and wiring are not OK.

Repair: Make the necessary repairs.

If the repair does not eliminate the problem, proceed to Test Step 7.

A. Inspect the wires and connectors to all circuit protection for the engine.

B. Check the device for circuit protection.

Repair: Reset the circuit breakers if the circuit breakers are tripped. If necessary, replace fuses (if equipped). Prior to returning the engine to service, determine the condition that caused the circuit breaker to trip. Make the necessary repairs.

Result The circuit protection device is not tripped.

Proceed to Test Step 8.

A. Thoroughly inspect the connectors for the engine speed/timing sensors.

B. Crank the engine, if the engine starts and no speed timing codes are logged, the speed timing circuit is operating properly.

Repair: Make the necessary repairs, Verify that the repair eliminated the problem. Refer to Troubleshooting, “Speed/Timing `- Test”