Cruise or Idle

This is a CLOSED LOOP mode.

At cruising speed, or idle, with the engine at operating temperature, the PCM receives inputs from:

- Air Conditioning Control Position

- Battery voltage

- Camshaft position (CMP) sensor

- Engine coolant temperature (ECT) sensor

- Manifold absolute pressure (MAP) sensor

- Intake air temperature (IAT) sensor

- Crankshaft position (CKP) sensor

- Throttle position sensor (TPS)

- Heated oxygen sensor (HO2S)

Based on these inputs the following occurs:

- The fuel injectors are fired by the PCM and ICM switching the ground path to control injection sequence and injector pulse width.

- The PCM monitors the oxygen sensor input and adjusts air/fuel ratio, adjusts engine idle speed, and controls ignition timing. The PCM adjusts the air/fuel ratio by controlling the injector pulse width, adjusts the engine idle speed by controlling the automatic idle speed motor, and adjusts the ignition timing through the ignition control module.