RING 0019677 - 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 0262-03 5 Volt Sensor DC Power Supply voltage above normal is not active.
Diagnostic code 0262-04 5 Volt Sensor DC Power Supply voltage below normal is not active.
Diagnostic code 1797-03 Fuel Rail Pressure Sensor voltage above normal is not active.
Diagnostic code 1797-04 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 event code will be logged.A warning will appear on the display on the control panel.Possible Performance Effect:E398-2The engine will be derated until the keyswitch is turned to OFF.Troubleshooting:Test Step 1. Low fuel pressure may be caused by the following faults:
A fault in the fuel return system
A fault in the fuel pressure control
A leak in the high pressure fuel system
A failed relief valve
A fault in the fuel pump
A faulty electronic unit injectorThe event code does not represent a fault in the electronic system. This event indicates low fuel rail pressure. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Inspect".Results:
OK - STOP