Idle Exhaust Emissions Test. Test Equipment. Idle exhaust emission test equipment shall be approved by the Administration and the Department. Test Procedures. The inspector shall fail the vehicle if sample dilution occurs. Except as provided in §A(2)(a) of this regulation, the inspector shall conduct the idle exhaust emissions test in accordance with the procedures specified in 40 CFR Part 51, Subpart S. Catalytic Converter Check. If the vehicle is required to be equipped with a catalytic converter, the inspector shall check for the presence of the catalytic converter, and fail the vehicle if a catalytic converter is not present. Gas Cap Leak Test. Test Equipment. Gas cap leak test equipment shall be approved by the Administration and the Department. Test Procedures. The inspector shall remove the gas cap from the vehicle, attach the gas cap to the test equipment, perform the leak test, return the gas cap to the vehicle, and properly tighten the gas cap on the vehicle. On-Board Diagnostics Test. Test Equipment. On-board diagnostics test equipment shall: Be approved by the Administration and the Department; and Meet the requirements and functions specified in 40 CFR §85.2231. Test Procedures. The inspector shall fail the vehicle if a component of the on-board diagnostics system is missing or damaged. Except as provided in §D(2)(a) of this regulation, the inspector shall conduct the on-board diagnostics test following the test procedure specified by the equipment manufacturer, and in accordance with the procedures specified in 40 CFR §85.2222.