Ignition Switch On

This is an OPEN LOOP mode. When the MPFI System is activated by the ignition switch, the following actions occur:

^ The Automatic Idle Speed (AIS) motor is pre-positioned by the engine controller for engine start-up.
^ The Manifold Absolute Pressure (MAP) sensor sends a signal to the engine controller, indicating the atmospheric pressure. The engine controller uses this input to set the basic fuel strategy.
^ The Coolant Temperature Sensor sends a signal to the engine controller, indicating the current coolant temperature. The engine controller uses this input to set the basic fuel strategy.
^ The Manifold Air Temperature (MAT) sensor and Throttle Position Sensor (TPS) inputs are monitored by the engine controller.
^ When the key is turned to the ON position (engine not running), the Auto Shutdown (ASD) relay is ACTIVATED for approximately 3 seconds, and if no crankshaft position signal is received by the engine controller, the ground will be removed from the ASD circuit DE-ACTIVATING the ASD relay. If the ASD relay is not ACTIVATED, battery voltage is not supplied to the ignition coil or the injectors.
^ The fuel pump is ACTIVATED by the fuel pump relay, via the ballast resistor, by the engine controller. The fuel pump will operate for approximately 1 second, and if no crankshaft position signal or starter motor engagement signal is received by the engine controller, the ground will be removed from the fuel pump relay circuit, DE-ACTIVATING the fuel pump. If the fuel pump relay is not ACTIVATED, battery voltage is not supplied to the fuel pump or the oxygen sensor heating element.
^ The oxygen sensor heating element is ENERGIZED via the fuel pump relay, by the engine controller. It will remain ENERGIZED for approximately 1 second, and if no crankshaft position signal or starter motor engagement signal is received by the engine controller, the ground will be removed from the fuel pump relay circuit, DE-ENERGIZING the oxygen sensor heating element. If the fuel pump relay is not ACTIVATED, battery voltage is not supplied to the fuel pump or the oxygen sensor heating element
^ The upshift indicator lamp is illuminated (Manual transmission).