Input Components

The PCM supplies a buffered voltage to the various information sensors and switches. The PCM monitors the input components for circuit continuity and out-of-range values. The PCM also provides performance checking. Performance checking refers to the PCM indicating a fault when the signal from an input does not seem reasonable (i.e. a Throttle Position (TP) sensor that indicates a high throttle position at low engine loads or low manifold absolute pressure sensor voltage). The input components may include, but are not limited to the following sensors and switches:
^ The Vehicle Speed Sensor (VSS)
^ The Crankshaft Position (CKP) Sensor
^ The Throttle Position (TP) Sensor
^ The Engine Coolant Temperature (ECT) Sensor
^ The Camshaft Position (CMP) Sensor
^ The Mass Air Flow (MAF) Sensor
^ The Manifold Absolute Pressure (MAP) Sensor
^ The Heated Oxygen Sensors (HO2S)
^ The fuel tank pressure sensor
^ The fuel level sensor
^ The diode module
^ The Power Steering Pressure (PSP) Switch, if equipped
^ The transmission range switch (A/T only)
^ The Clutch Pedal Position (CPP) switch (M/T only)

For more information on some of the PCM input components refer to Information Sensors/Switches Description.