Input Components

Input components are monitored for circuit continuity and out-of-range values. Input components are also tested for rationality. A rationality condition occurs when the signal from a sensor is not reasonable. For example, a throttle position (TP) sensor that indicates high throttle position at low engine loads, or manifold absolute pressure (MAP) voltage, will set a rationality DTC. Input components may include, but are not limited to, the following sensors:

• Vehicle speed sensor (VSS)
• Crankshaft position (CKP) sensor
• Throttle position (TP) sensor
• Engine coolant temperature (ECT) sensor
• Camshaft position (CMP) sensor
• Manifold absolute pressure (MAP) sensor

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.