DTC P0605: Engine Control Module
WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
The ECM calculation function is malfunctioning. The ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (about 5 degrees) by the return spring. When the accelerator pedal depressed value reaches a throttle opening of 30 degrees or more, the throttle valve opens to a maximum of 20 degrees by the accelerator cable. Engine speed will not rise more than 2,500 RPM due to the fuel cut.