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 angle at low engine loads or speeds 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 sensors ability to achieve a steady state temperature in order to enable a Closed Loop fuel control.