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Home >> Saturn >> 2006 >> Ion Red Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 251 (Engine Controls - 2.2L - DTC P0136 To DTC P0442) >> DTC P0300 >> System Description

System Description

WARNING: This page is about a different car, the 2006 Saturn Ion 3 and 2006 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) uses information from the crankshaft position (CKP) sensor and the ignition control (IC) module to determine when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM 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 lamp (MIL) will flash ON and OFF when the conditions for TWC overheating are present. If the ECM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, DTC P0300 will set.

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