§ 85.2222 Onboard diagnostic test procedures.
The test sequence for the OBD inspection shall consist of the following steps:
(a) The OBD inspection shall be conducted with the key-on/engine running, with the exception of inspecting for MIL illumination as required in paragraph (d)(4) of this section, during which the inspection shall be conducted with the key-on/engine off.
(b) The inspector shall locate the vehicle connector and plug the test system into the connector.
(c) The test system shall send a Mode $01, PID $01 request in accordance with 40 CFR 86.1806 to determine the OBD evaluation status. The test system shall determine what monitors are supported by the OBD system, and perform the readiness evaluation for applicable monitors in accordance with the requirements and specifications in 40 CFR 86.1806.