Input Components

The powertrain control module (PCM) monitors the input components for circuit continuity and out-of-range values. This includes performance checking. Performance checking refers to indicating a fault when the signal from a sensor does not seem reasonable, such as a throttle position (TP) sensor that indicates high throttle position at low engine loads or MAP voltage. The input components may include, but are not limited to, the following sensors:

• Vehicle speed (VSS) sensor
• Mass air flow (MAF) sensor
• Intake air temperature (IAT) sensor
• Crankshaft position (CKP) sensor
• Knock sensor (KS)
• 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.