Input Components

The PCM supplies a buffered (reference) 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 Heated Oxygen Sensor (HO2S)
^ The Fuel Tank Pressure (FTP) sensor
^ The Knock Sensor (KS)
^ The Power Steering Pressure (PSP) switch, if equipped
^ The transmission range switch (A/T only)
^ The A/C compressor control module (A/C relay)