Engine Warm-Up

This is an OPEN LOOP mode. The following inputs are received by the SBEC:

^ Air conditioning select signal
^ Air conditioning request signal
^ Battery voltage
^ Coolant temperature sensor
^ Crankshaft Position Sensor (CPS)
^ Manifold Air/fuel Temperature (MAT) sensor
^ Manifold Absolute Pressure (MAP) sensor
^ Neutral safety switch (Automatic Transmission)
^ Sync signal
^ Throttle Position Sensor (TPS)

Based on the previous input signals, the following occurs:

^ The fuel injector pulse width and injector firing sequence are controlled by the engine controller. The engine controller does this by switching the ground to the injectors OFF and ON.
^ The engine controller adjusts the idle speed by controlling the Automatic Idle Speed (AIS) motor, and the ignition timing by controlling the ignition module.
^ The engine controller controls the A/C compressor clutch via the A/C clutch relay, if the driver has selected A/C and if the A/C thermostat has requested A/C.
^ The upshift indicator lamp is controlled by the engine controller (Manual Transmission).
^ Once the engine has reached normal operating temperature, the engine controller will monitor the Oxygen sensor's input. Once the engine controller begins to monitor the Oxygen sensor's input, the engine controller leaves warm-up mode and enters closed loop operation.