Input Components

Input components are monitored for circuit continuity and out-of-range values. This includes rationality checking. Rationality checking refers to indicating a fault when the signal from a sensor does not seem reasonable. An example of a rationality concern is a throttle position (TP) sensor that indicates high throttle position at low engine loads. Input components may include, but are not limited to, the following sensors:

• Throttle position (TP) sensor
• Engine coolant temperature (ECT) sensor
• Intake air temperature (IAT) sensor
• Crankshaft position (CKP) sensor
• Camshaft position (CMP) sensor
• Heated oxygen sensor (HO2S)
• Knock sensor (KS)
• Manifold absolute pressure (MAP) sensor
• Vehicle speed sensor (VSS)

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