Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 6259 PID: SPN: 1075 FMI: 4 Electric Lift Pump For Engine Fuel Supply- Voltage Below Normal or Shorted to Low Source
Circuit Description
The fuel lift pump circuit is a discrete output in the engine control module (ECM) that controls the electric fuel lift pump. The lift pump is grounded in the ECM.
Component Location
The fuel lift pump is mounted on the intake side of the engine.
Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is initially turned to the ON position.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the fuel lift pump signal circuit was detected to be 0-VDC when the signal is turned ON by the engine control module (ECM).
Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
To validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
Possible causes of this fault code include:
A short circuit to ground in the engine harness
A malfunctioning fuel lift pump
Possible Cause:
1) Electric Fuel lift pump failure
2) Engine harness
3) ECM failure
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