WARNING: Extreme High Fuel Rail Pressure. The SIDI Fuel Injectors and fuel rail
have extreme high fuel pressures. Do not attempt to remove or service these parts. This
poses a potentially hazardous situation that if not avoided, could result in severe
personal injury or death, damage to engine and or property.
STARTING MODE–FUEL INJECTION
With the ignition switch in the ON position, before engaging the starter, the ECM energizes the
fuel pump relay for 10 seconds allowing the fuel pump to build pressure. The ECM uses the
engine coolant temperature (ECT), the throttle position (TPS) and the manifold absolute
pressure (MAP) sensors to determine the proper air/fuel ratio for starting. The ECM controls
the amount of fuel delivered in the starting mode by changing the pulse width of the injectors.
CLEAR FLOOD–FUEL INJECTION
If the engine becomes flooded, clear the engine by opening the throttle to 100 percent. When
the pedal position sensor (PPS) is at wide-open throttle, the ECM reduces the injector pulse
width in order to increase the air to fuel ratio. The ECM holds this injector rate as long as the
throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is
not held wide open, the ECM returns to the starting mode.
COLD ENGINE START
On a cold engine start, the engine idle speed will be elevated until the coolant temperature
reaches operating temperature. As the engine temperature increases the idle speed will
gradually decrease, this is a normal engine control function.
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