I/M Program

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Demonstrating Proof of Compliance

Vehicle Inspection and Maintenance (I/M) Program - index
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14

Enclosure (3) to COMDTINST 4454.1

II.

I/M Program

Technical Requirements

The I/M technical requirements are outlined in the SIP for each state or local nonattainment

area listed in enclosure (1). Because of the diversity of nonattainment areas and state

requirements, each SIP will be different; only the general requirements as listed in 40 CFR

Part 51 Subpart S are discussed here. States can adopt more stringent test standards for older

vehicles, but ultimately EPA must approve the SIP. The high enhanced, alternate low

enhanced, and basic I/M test requirements as well as an explanation of key terms are

described below.

High Enhanced Test

Start Date:

January 1, 1995 (The date the State must begin testing)

Frequency:

Annually (biannually allowed if State can demonstrate attainment)

Model Year

Coverage:

Covers 1968 and later vehicles

Vehicles

Covered:

Light duty cars and light duty trucks, rated up to 8,500 pounds Gross

Vehicle Weight Rating (GVWR)

Waiver

costs:

Minimum 0 spent for repairs, adjusted for inflation.

Test Type

Idle or two speed test, plus visual

2.

Alternate Low Enhanced Test

This revision to the standards is for nonattainment areas that are required to implement

high enhanced testing (#1 above) but which can obtain adequate emission reductions

from other sources without the stringency of enhanced testing (see reductions in waiver

costs and test type below).

Start Date:

18 Oct 1995

Testing

Frequency:

Annually

5

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