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SPN 1349 - FMI 18 (Fault Code 486)

SPN1349 FMI18
Injector Metering Rail 2 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level

Integrated Fuel System Module (IFSM)

CODES:
Fault Code: 486
PID(P), SID(S): P129
SPN: 1349
FMI: 1/18
Lamp: Amber

REASON: The ECM has detected that fuel pressure is lower than commanded pressure.

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

Circuit Description:
The electronic control module (ECM) supplies voltage to open the rear fueling actuator for a short length of time allowing a short pulse of fuel to flow to the injector. The injector then injects the fuel into the cylinder for combustion.

Component Location:
The rear fuel metering actuator is located on the fuel control housing. It is the first actuator from the rear of the engine. The fuel control housing is located on the intake side of the engine below the exhaust gas mixer.

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:
This fault is set active if the ECM estimates that the rear bank is receiving insufficient fuel flow.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
• Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

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:
-A malfunctioning fuel rail actuator.


Read More:
SPN 191 - FMI 18 (Fault Code 489)
SPN 1189 - FMI 3 (Fault Code 491)









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