DTC P2B95-2F: Cold Start Injection Pulse Performance: General Description

The fuel injector is a solenoid-operated valve that meters the fuel flow to each combustion cylinder. The fuel injector is opened and closed a constant number of times per crankshaft revolution. The amount of fuel is controlled by the length of time the fuel injector is held open. The fuel injector is normally closed, and is operated by a 12-volt source from either the Engine Control Module (ECM) power relay or the fuel pump relay. The ground signal is controlled by the ECM.

Depending on the RPM, mass air flow, the ECM controls GDI/MPI alone injection, GDI + MPI mixed injection, and GDI ↔ MPI switched injection.