Current through Register Vol. 56, No. 24, December 18, 2024
(a) he
procedure for the OBD inspection, to be used to determine a diesel vehicle's
compliance with the OBD inspection requirements at
N.J.A.C.
7:27-14.5 is as follows:
1. Turn off the motor vehicle's engine and
connect the analyzer to the motor vehicle computer via the DLC located on the
motor vehicle;
2. If the DLC is
damaged, missing or obstructed, the motor vehicle has failed the OBD
inspection;
3. Determine if the MIL
is functional by briefly turning the motor vehicle ignition system to the KOEO
position;
4. If the MIL is not
functional, the motor vehicle has failed the OBD inspection;
5. Start the motor vehicle and leave the
engine running. Determine if the MIL remains illuminated while the engine is
running;
6. If the MIL is
illuminated with the engine running, the motor vehicle has failed the OBD
inspection;
7. The analyzer will
attempt to communicate with the motor vehicle's OBD system;
8. If the analyzer cannot successfully
communicate with the motor vehicle's OBD system, the motor vehicle has failed
the OBD inspection;
9. If the
analyzer successfully communicates with the motor vehicle OBD system, it will
then retrieve stored information relating to the identification of the motor
vehicle and any malfunctions recorded by the OBD system;
10. If the analyzer determines that the OBD
system or the motor vehicle is malfunctioning, the motor vehicle has failed the
OBD inspection;
11. If the analyzer
indicates that the motor vehicle does not meet the EPA's criteria for
"readiness," that is, if the vehicle's OBD system does not indicate that the
critical number of supported readiness monitors have been set, the motor
vehicle is deemed "not ready" for an OBD inspection and has failed the OBD
inspection; and
12. If the analyzer
indicates that the motor vehicle is deemed "ready" and determines that all
components of the OBD system are functioning properly, and the OBD system is
not indicating any malfunctions of the motor vehicle, then the motor vehicle
has passed the OBD inspection.
(b) The OBD inspection procedure is largely a
process whereby the diesel emissions testing equipment and the motor vehicle's
OBD system interface and exchange information. As such, the description of the
on board diagnostics inspection procedure set forth at (a) above is a brief,
simplified description that does not contain explicit technical details. A more
detailed flow chart version, reflecting the logic flow of pass and fail
determinations within the procedure, as well as the Department's OBD equipment
specifications, which contain additional technical details, are available
electronically by contacting the Department's Bureau of Mobile Sources at the
address at N.J.A.C. 7:27B-4.2(e)
or by calling (609) 292-7953.
