OBD-II ON BOARD DIAGNOSIS-II SYSTEM
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When the same malfunction is detected and maintained during two sequential driving cycles, MIL will automatically light.
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MIL will go off automatically after 3 sequential driving cycles without the same malfunctions.
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After the ECM first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted and the same malfunction is re-detected. However, for misfire and CKP sensor, diagnostic trouble codes are recorded on the first detection of the malfunction.
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After recording the diagnostic trouble code, if the ECM does not re-detect the malfunction for 80 warm-up cycles, the diagnostic trouble code will be erased automatically from the ECM memory.
NOTE
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A "warm-up cycle" means sufficient vehicle operation such that the coolant temperature has risen by at least 40 degrees Fahrenheit from engine starting and reaches a minimum temperature of 160 degrees Fahrenheit.
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A "driving cycle" consists of engine startup, vehicle operation beyond the beginning of closed loop operation