Overview

Fuel Pump Pressurizing Assembly 1 Circuit

Circuit Description

The circuit is a pulse width modulated driver in the engine control module (ECM) that controls the fuel pump pressurizing assembly 1. The fuel pump pressurizing assembly 1 is grounded in the ECM. The ECM varies the current to this valve to provide the correct fuel flow to the high-pressure pump based on engine operating conditions. The fuel pump pressurizing assembly 1 valve is a normally open valve. Pulse width modulation duty cycle to the fuel pump pressurizing assembly 1 depends on the difference between desired rail pressure and sensed rail pressure.

Component Location

The fuel pump pressurizing assembly 1 is located on the engine-mounted fuel pump housing. The engine wiring harness and the ECM are other components in the circuit that can cause this fault code. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E.

Shop Talk

This fault becomes active when the ECM detects an open fuel pump pressurizing assembly 1 circuit. Causes for this fault code are a short circuit to a positive voltage or an open circuit in the fuel pump pressurizing assembly 1 circuit. If there is a high harness resistance or an intermittent open circuit, Fault Code 2311 could have high inactive counts. If the fault code is intermittent, look for causes of an intermittent open circuit such as loose pins and bad connections. If the fault code is intermittent, look closely for loose wire connections at the ECM connector. Also, if the fault code is intermittent, wiggle the harness and the fuel pump pressurizing assembly 1.

Refer to Troubleshooting Fault Code t05-272.

Last Modified: 29-Nov-2012

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