CEI CEI Vehicle Inspection & OBD Systems

Question 1

What does OBD-II stand for in the context of vehicle emission inspections?

Accepted Answer

On-Board Diagnostics, second generation

Answer

OBD-II stands for On-Board Diagnostics, second generation, a standardized system required on all US vehicles since 1996 to monitor emission-related components.

Question 2

Which OBD-II readiness monitor must be in a 'complete' or 'ready' state for a vehicle to pass an emission inspection?

Accepted Answer

All required monitors must show complete or ready

Answer

For a vehicle to pass an OBD-II emission test, all required readiness monitors must be set to complete or ready, indicating the self-tests have run and passed.

Question 3

What is the maximum number of OBD-II readiness monitors that can be 'not ready' on a 1996–2000 MY vehicle without causing an automatic OBD test failure in most US states?

Accepted Answer

2 monitors not ready

Answer

For model year 1996–2000 vehicles, most state I/M programs allow up to 2 readiness monitors to be incomplete before the vehicle automatically fails the OBD portion of the test.

Question 4

A Malfunction Indicator Lamp (MIL) illuminated solid during an OBD-II inspection indicates what?

Accepted Answer

A stored Diagnostic Trouble Code related to an emission system fault

Answer

A solid MIL (Check Engine Light) indicates one or more Diagnostic Trouble Codes (DTCs) are stored, signaling a detected emission-related fault.

Question 5

Which connector port is used to access OBD-II data during a vehicle emission inspection?

Accepted Answer

DLC (Data Link Connector), a 16-pin J1962 port

Answer

The Data Link Connector (DLC), standardized as a 16-pin J1962 connector, is the interface used to plug in scan tools and access OBD-II data.

CEI - Certified Emission Inspector Practice Test

CEI - Certified Emission Inspector Practice Test

CEI CEI Vehicle Inspection & OBD Systems