Input Components:

Input components are monitored for circuit continuity and out-of-range values. This monitoring includes rationality checking. Rationality checking means a fault will be indicated when the signal from a sensor does not seem reasonable. For example, a throttle position (TP) sensor that indicates a high throttle position at low engine loads or MAP voltage is irrational. The input components may include, but are not limited to the following sensors:
^ The vehicle speed sensor (VSS)
^ The crankshaft position (CKP) sensor
^ The knock sensor (KS)
^ The throttle position (TP) sensor
^ The engine coolant temperature (ECT) sensor
^ The camshaft position (CMP) sensor
^ The mass air flow (MAF) sensor

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