Input Components

The PCM monitors the input components for circuit continuity and out-of-range values. This includes performance checking. Performance checking refers to indicating a fault when the signal from a sensor does not seem reasonable (i.e., a TP sensor that indicates high throttle position at low engine loads or MAP voltage). The input components may include but are not limited to the following sensors:
^ The Vehicle Speed (VSS) sensor
^ The Accelerator Pedal Position (APP) sensor, if so equipped
^ Mass Air Flow (MAF) sensor
^ Intake Air Temperature (IAT) sensor
^ Crankshaft Position (CKP) sensor
^ Knock Sensor (KS)
^ Throttle Position (TP) sensor
^ Engine Coolant Temperature (ECT) sensor
^ Camshaft Position (CMP) sensor
^ Manifold Absolute Pressure (MAP) sensor

In addition to the circuit continuity and rationality check, the ECT sensor is monitored for its ability to achieve a steady state temperature to enable closed loop fuel control.