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Home >> Saturn >> 2005 >> Ion Red Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Description and Operation >> Fuel System Description >> Starting Mode

Starting Mode

When the ignition is first turned ON, the control module energizes the fuel pump relay for 2 seconds. This allows the fuel pump to build pressure in the fuel system. The control module calculates the air/fuel ratio based on inputs from the engine coolant temperature (ECT), manifold absolute pressure (MAP), and throttle position (TP) sensors. The system stays in starting mode until the engine speed reaches a predetermined RPM.

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