Cruise

When the engine is at normal operating temperature, this is a CLOSED LOOP mode. When the engine is at cruising speed, the controller receives the following inputs:

^ 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)
^ Oxygen sensor
^ 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 monitors the oxygen sensor's input, and changes the injector pulse width to keep the air/fuel ratio as close to 14.7:1 as possible.
^ The engine controller increases or decreases the ignition spark advance and ignition timing by applying and removing the ground path to 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.