(a) Immediately prior to the wait time portion of the test run described in § 86.1437 or § 86.1438, or immediately prior to warmup operation, the steps described in paragraphs (b) through (d) of this section must be performed.
(b) Check the device(s) for removing water from the exhaust sample and the sample filter(s). Remove any water from the water trap(s). Clean and replace the filter(s) as necessary.
(c) Set the zero and span points of the analyzer with the electrical spanning network or with analytical gases.
(d) Attach the tachometer to the vehicle in accordance with the analyzer manufacturer's instructions. The manufacturer must ensure, for all test and production vehicles and engines, that the rpm signal is capable of being read by an exhaust gas analyzer via:
(1) A conventional inductive tachometer; or
(2) The onboard diagnostics (OBD) connector, as described under the provisions of § 86.094-17; or
(3) A dedicated electrical lead, marked “rpm” and located under the hood, with a female-type, quarter-inch spade terminal. The digital transistor-transistor logic (TTL) signal must span the 0V-5V range at a rate of one pulse per engine revolution, synchronized to the top dead center position.
Title 40 published on 2013-07-01
The following are only the Rules published in the Federal Register after the published date of Title 40.
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