CORE AS-RADIATOR 2459207 - Caterpillar

Conditions Which Generate This Code: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:If equipped, the warning lamp will come on and the event code will be logged.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 problems:
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, the fuel pump or an electronic unit injectorThe event code does not represent a fault in the electronic system. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Inspect".Results:
OK - STOP