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Home >> Pontiac >> 2002 >> Aztek FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (Engine Controls - Theory & Operation - 2.2L) >> Computerized Engine Controls >> Input Devices >> Crankshaft Sensor
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Crankshaft Sensor

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The Powertrain Control Module (PCM) uses information from the Crankshaft Position (CKP) sensor and the Ignition Control Module (ICM) to determine when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the 3-way Catalytic Converter (TWC) to overheat under certain driving conditions. The Malfunction Indicator Light (MIL) will flash ON and OFF when the conditions for TWC overheating are present. If the PCM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, the PCM will set a DTC.

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