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• Idle • Acceleration • Deceleration • Wide Open Throttle • Ignition switch OFF 5. The engine start-up (crank), engine warm-up, deceleration with fuel shutoff and wide open throttle modes are OPEN LOOP modes. Under most operating conditions, the acceleration, deceleration (with A/C on), idle and IGNITION SWITCH ON (ZERO RPM) MODE When the ignition switch activates the fuel injection system, the following actions occur: • The PCM monitors the engine coolant temperature sensor and throttle position sensor input. The PCM deter- • The PCM determines atmospheric air pressure from the MAP sensor input to modify injector pulse width. When the key is in the ON position and the engine is not running (zero rpm), the Auto Shutdown (ASD) and fuel ENGINE START-UP MODE This is an OPEN LOOP mode. If the vehicle is in park or neutral (automatic transaxles) or the clutch pedal is • If the PCM receives the camshaft position sensor and crankshaft position sensor signals, it energizes the Auto • The PCM energizes the injectors (on the 69° degree falling edge) for a calculated pulse width until it deter- • After determining crankshaft position, the PCM begins energizing the injectors in sequence. It adjusts injector • When the engine idles within ±64 RPM of its target RPM, the PCM compares current MAP sensor value with Once the ASD and fuel pump relays have been energized, the PCM determines injector pulse width based on the • MAP • Engine RPM • Battery voltage • Engine coolant temperature • Inlet/Intake air temperature (IAT) • Throttle position • The number of engine revolutions since cranking was initiated During Start-up the PCM maintains ignition timing at 9° BTDC. ENGINE WARM-UP MODE This is an OPEN LOOP mode. The following inputs are received by the PCM: • Manifold Absolute Pressure (MAP) • Crankshaft position (engine speed) • Engine coolant temperature • Inlet/Intake air temperature (IAT) • Camshaft position 14 - 170 FUEL INJECTION LX |