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 camshaft position (CMP) sensor
• The accelerator pedal position (APP) sensors
• The serial data from the throttle actuator control (TAC) module
• The engine coolant temperature (ECT) sensor
• The intake air temperature (IAT) sensors
• The heated oxygen sensors (HO2S)
• The fuel tank pressure (FTP) sensor
• The exhaust gas recirculation (EGR) valve position sensor
• The vehicle speed sensor (VSS)
• The rocker arm oil pressure switch
• The power steering pressure (PSP) switch, if equipped
• Transmission sensors and switches
• A/C system sensors