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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - Introduction (2 Of 2)) >> Description and Operation >> Fuel System Description >> Fuel Metering Modes of Operation >> Starting Mode

Starting Mode

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When the ignition is first turned ON, the ECM energizes the fuel pump relay for 2 seconds. This allows the fuel pump to build pressure in the fuel system. The ECM calculates the air/fuel ratio based on inputs from the engine coolant temperature (ECT), mass air flow (MAF), 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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