![]() ![]() A P0303 code, for example, would tell you that the No. The OBD II system will identify the cylinder(s) that are not contributing their normal dose of power and set a code that corresponds to the firing order. Misfires that turn on the check engine light and log a cylinder-specific fault code are the easiest to diagnose. Typically, the engine coolant temperature, cylinder head temperature, intake air temperature and, if equipped, the mass air flow sensor (or a combination of these) are used to evaluate the condition as well as the crank and cam positions. The misfire detection is enabled after certain base information is received by the PCM. ![]() When a power loss is less than the calibrated value, the suspected cylinder is determined to be misfiring by the PCM. The crankshaft rotational velocity and acceleration are compared in the event of a power loss from each cylinder. The PCM calculates the time between the edges of the crank reluctor wheel teeth by receiving a signal from the CKP sensor. With most engines, the crank sensor is the key component in determining a misfire. A misfire code is set when the computer detects a situation where there is an unexpected change in crankshaft speed. Misfire codes do not always indicate there is an issue with the ignition system.
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