4-10 FI SYSTEM DIAGNOSIS FI SYSTEM TECHNICAL FEATURES INJECTION TIME (INJECTION VOLUME) The factors to determine the injection time include the basic fuel injection time, which is calculated on the basis of intake air pressure, engine speed and throttle opening angle, and various compensations. These compensations are determined according to the signals from various sensors that detect the engine and driving conditions. ECM Intake Air Pressure Intake air pressure Sensor (IAP Sensor) signal Basic Crankshaft Position Engine speed fuel Sensor (CKP Sensor) signal injection time Throttle Position Throttle opening Sensor (TP Sensor) signal Various Various signals Compensation Sensors E LUltimate Injectors Injection signal P fuel injection AM time S