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Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal, or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2265 PID: S126 SPN: 1075 FMI: 3 LAMP: Amber SRT: |
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. |
 Electric Fuel Lift Pump Circuit
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Circuit Description
On 12 VDC Automotive and 24 VDC Industrial or Marine systems, 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.
On 24 VDC Automotive systems, the circuit is a pulse width modulated driver in the ECM that controls the electric fuel lift pump relay. The circuit includes two additional components, a relay and voltage regulator. The ECM controls voltage to the relay. When the relay is engaged, an OEM supplied power source delivers 24 VDC to the voltage regulator. The voltage regulator reduces the 24 VDC to 12 VDC, which is then delivered to the lift pump.
Component Location
On both 12 and 24 VDC systems, the electric fuel lift pump is located behind the ECM cooling plate on the intake side of the engine. Refer to Procedure 100-002 for a detailed component location view.
On 24 VDC Automotive systems, the relay is located in the harness between the voltage regulator and the OEM power supply on the bottom edge of the ECM. The voltage regulator is located just below the ECM.
Shop Talk
On 12 VDC Automotive and 24 VDC Industrial or Marine systems, this fault code becomes active if the ECM detects an open circuit at keyswitch ON. The cause of this fault code is 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 keyswitch ON, the lift pump duty cycle ramps to 100 percent. This fault code can detect open circuit conditions only at keyswitch ON. If an open circuit condition is indicated after the engine is started (while the lift pump is already running), Fault Code 2265 will not become active.
On 24 VDC Automotive systems, this fault code becomes active if the ECM detects an open circuit at keyswitch ON. Causes of this fault code are an open circuit in the electric fuel lift pump wiring harness, relay, or engine harness. This fault code will not become active if the voltage regulator or electric fuel lift pump has failed.
Refer to Troubleshooting Fault Code t05-2265
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