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 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 vehicle speed sensor (VSS)
• The power steering pressure (PSP) switch, if equipped
• The transmission range switch (A/T only)
• The A/C compressor control module (A/C relay)