Cruise Mode

CRUISE MODE

When the engine is at operating temperature, this is a Closed Loop mode. At cruising speed, the Powertrain Control Module (PCM) receives inputs from:

- Air conditioning select signal (if equipped)

- Air conditioning request signal (if equipped)

- Battery voltage

- Engine Coolant Temperature Sensor (CTS)

- Crankshaft Position (CKP) Sensor

- Intake Manifold Air Temperature (IAT) Sensor

- Manifold Absolute Pressure (MAP) Sensor

- Throttle Position Sensor (TPS)

- Camshaft Position Sensor (CPS) signal (in the distributor)

- Park/neutral switch (gear indicator signal-auto. trans. only)

- Oxygen (O2S) sensors

Based on these inputs, the following occurs:

- Voltage is applied to the fuel injectors with the Automatic Shutdown (ASD) relay via the PCM. The PCM will then adjust the injector pulse width by turning the ground circuit to each individual injector on and off.

- The PCM monitors the 02S sensor input and adjusts air-fuel ratio. It also adjusts engine idle speed through the Idle Air Control (IAC) motor.

- The PCM adjusts ignition timing by turning the ground path to the coil on and off.

- The PCM operates the A/C compressor clutch through the clutch relay. This happens if A/C has been selected by the vehicle operator and requested by the A/C thermostat.