Fuel Metering System

The function of the fuel metering system is deliver the correct amount of fuel to the engine under all operating conditions. Fuel is delivered to each cylinder by the fuel injectors. The fuel injectors are controlled sequentially by the powertrain control module (PCM). The PCM bases the control of the fuel injectors on several important engine parameters. These engine parameters include the following:

• Engine speed (RPM)
• Accelerator pedal position (APP)
• Engine coolant temperature (ECT)
• Intake air temperature (IAT)
• Manifold absolute pressure (MAP)
• Fuel control oxygen sensor input (HO2S 1)