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.
The warning light on the control panel will flash.
Possible Performance Effect:
E398-1
The 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. There can be a fault with the fuel return system. There can be a fault with the fuel pressure control. There can be a leak in the high pressure fuel system.
A failed relief valve, the fuel pump or an electronic unit injector may cause an event code to be logged.
The event code does not represent a fault with the electronic system. This event indicates low fuel rail pressure. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Inspect".
Results:
- OK - STOP