Circuit DescriptionThe 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 LocationThe fuel lift pump is mounted on the intake side of the engine.

Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is initially turned to the ON position.

Conditions for Setting the Fault CodesThe 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 ActiveThe ECM logs the fault code immediately when the diagnostic runs and fails.Conditions for Clearing the Fault CodeTo 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 TalkPossible causes of this fault code include:

A short circuit to ground in the engine harnessA malfunctioning fuel lift pump

Possible Cause:1) Electric Fuel lift pump failure2) Engine harness3) ECM failure