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, i.e. Throttle Position (TP) sensor that indicates high throttle position at low engine loads or Manifold Absolute Pressure (MAP) voltage. Input components may include, but are not limited to, the following sensors:

• Idle air control motor
• 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.