3. GENERAL DRIVING CYCLE
- If conditions are met, it is possible to detect the misfires from idling to high engine speed. However, in case any engine load or breakage
occurs, perform with the engine at idle.
- Perform the diagnosis continuously.
4. DIAGNOSTIC METHOD
When a misfire occurs, the engine speed will decrease and the crankshaft position speed will change. Calculate the interval difference value
(diagnostic value) from crankshaft position speed by the following formula, and judge whether a misfire is occurring or not comparing the
calculated result with judgment value. Count the number of misfires, if the misfire ratio is higher during 1000 revs. or 200 revs., judge
corresponding cylinders as NG.
As shown in the following figure, pick a cylinder as the standard and name it omg 0. And the former crankshaft position speed is named omg
1, the second former crankshaft position speed is named omg 2, the third is named omg 3, etc.
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