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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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