Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal or Shorted to High Source
|Fault Code: 2265
Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal or Shorted to High Source. High voltage or open detected at the fuel lift pump signal circuit.
Engine can be difficult to start.
ISC and ISL with CM2150 – Electric Fuel Lift Pump Circuit
The circuit is a pulse width modulated driver in the electronic control module (ECM) that controls the electric fuel lift pump. The lift pump is grounded in the ECM.
The electric fuel lift pump is located behind the ECM cooling plate on the intake side of the engine. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The engine fuel lift pump circuit pulse width modulated signal is detected to be greater than 0-VDC when the pulse width modulated signal is turned off by the ECM.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- The engine fuel lift pump will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared with INSITE™ electronic service tool.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
This fault becomes active if the ECM detects an open circuit at key-on. Causes of this fault code include an open circuit in the electric fuel lift pump circuit.
If the fault code is intermittent, look for causes of an intermittent open circuit, such as loose pins and bad connections. At key-on, the lift pump duty cycle ramps to 100 percent. This fault code can detect open circuit conditions only at key-on. The lift pump only runs at key-on and during cranking to aid in priming of the gear pump.