SPN 94 - FMI 18 (Fault Code 482)

Engine Fuel Delivery Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level

Fuel System Flow

Fault Code: 482
PID(P), SID(S): P94
SPN: 94
FMI: 1/18
Lamp: None

REASON: Low fuel delivery pressure has been detected.

EFFECT: Engine may run rough, may stop running, may not start, or may be difficult to start.

Circuit Description:
The engine control module (ECM) provides a 5 volt supply and ground to the fuel pressure sensor on the sensor supply circuit. The Fuel pressure sensor provides a signal to the ECM on the fuel pressure sensor signal circuit. This sensor monitors the fuel pressure from the low fuel pressure system (lift pump to the stage 2 filter).

Component Location:
The fuel pump, fuel filter and lift pump are located on the intake side of the engine.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the measured fuel pressure is less than 4.5 bar.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

Shop Talk:
Possible causes of this fault code include:
• Damaged or sticking anti-drainback valve, located in the fuel supply circuit, in the integrated fuel system module (IFSM) which is located directly above the fuel lift pump.

Read More:
SPN 1349 - FMI 4 (Fault Code 484)
SPN 1349 - FMI 3 (Fault Code 483)


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