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Idle fault diagnosis lubrication and calibration failure minimum self cleaning iac valve 6 pins cleaning and calibration iac valve 6 pins cleaning minimum valve 6 pins cleaning and calibration minimum valve 6 pins cleaning iac valve 4 pins cleaning and calibration iac valve 4 pins cleaning minimum valve 4 pins cleaning and calibration minimum valve 4 pins Idle fault diagnosis lubrication and calibration failure iac valve minimum self cleaning