C6.6 Marine Generator Set Caterpillar

The Electronic Control Module (ECM) detects a fault with low fuel rail pressure. The ECM detects the following faults:

• The ECM determines that the expected fuel rail pressure is lower than the pressure that is requested by the electronic control system.

• Diagnostic code 262-3 5 Volt Sensor DC Power Supply voltage above normal is not active.

• Diagnostic code 262-4 5 Volt Sensor DC Power Supply voltage below normal is not active.

• Diagnostic code 1797-3 Fuel Rail Pressure Sensor voltage above normal is not active.

• Diagnostic code 1797-4 Fuel Rail Pressure Sensor voltage below normal is not active.

• No diagnostic codes are active for the fuel rail pump.

• No diagnostic codes are active for the fuel injectors.

System Response:

The warning lamp will be illuminated and the warning horn may sound. If equipped, the diagnostic lamp will flash the event code.

The event code will be logged.

E398-2

The engine will be derated until the keyswitch is turned to OFF and then turned to ON.

Test Step 1.

Low fuel pressure may be caused by the following faults:

• A fault in the return system for the fuel

• A fault in the fuel pressure control

• A leak in the high pressure fuel system

• A failed relief valve, the fuel pump or an electronic unit injector

The event code does not represent a fault in the electronic system. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Inspect".

Results:

• OK - STOP