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 in the ON position and the lift pump timer has expired 1 minute after initial key ON.
Conditions for Setting the Fault CodesThe ECM detected the fuel lift pump signal circuit was detected to be greater than 0 VDC when the signal was turned off by the 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 CodePerform a key cycle. Leave the key switch in the ON position for at least 2 minutes.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 malfunction indicator lamp for on-board diagnostics applications.
Shop TalkPossible causes of this fault code include:
An open circuit in the engine harnessA short circuit to battery in the engine harnessA malfunctioning fuel lift pump.
Possible Cause:1) Electric fuel lift Pump failure2) Engine harness3) ECM calibration