Page 789 - Workshop Manual - Tunland (2017)
P. 789

DIAGNOSTICS - ENGINE CONTROL SYSTEM                          04-103

                 P271，P272，P2311-ENGINE FUEL PUMP BOOSTER ASSEMBLY                                                   04

                 FAULT
                 P271-ENGINE FUEL PUMP BOOSTER ASSEMBLY 1 CIRCUIT

                 -VOLTAGE IS BELOW NORMAL OR SHORTED TO HIGH VOLTAGE
                 POWER SUPPLY
                 P272-ENGINE FUEL PUMP BOOSTER ASSEMBLY 1 CIRCUIT

                 -VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH VOLTAGE
                 POWER SUPPLY

                 P2311-ELECTRONIC FUEL INJECTION CONTROL VALVE CIRCUIT
                 - FAULT EXISTS

                 Description
                 1 .    The engine fuel pump booster assembly is a pulse width modulation (PWM)
                        driver in the engine control module (ECM) that controls the electronic fuel control
                        actuator.The actuator ground via the ECM and is normally open.The PWM load
                        cycle output to the electronic fuel control actuator is determined by the difference
                        between desired oil rail pressure and the induced oil rail pressure.
                 Circuit Diagram
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