Overview
Code
Fault Code: 2266
PID: S126
SPN: 1075
FMI: 4/4
LAMP: Amber
SRT:
Reason
High voltage or open circuit detected at the fuel lift pump signal circuit.
Effect
Engine may not start or may be difficult to start.
Engine Lift Pump Supply Circuit
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 illuminates the amber CHECK ENGINE lamp 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 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, 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
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