CEI CEI Vehicle Inspection & OBD Systems 2

Question 1

During a visual inspection for emission testing, an inspector notices the catalytic converter has been removed and replaced with a straight pipe. What is the correct action?

Accepted Answer

Fail the vehicle for tampering with required emission control equipment

Answer

Removal of required emission control equipment such as a catalytic converter constitutes tampering and is grounds for automatic failure of the emission inspection.

Question 2

What is the purpose of the evaporative emission control (EVAP) system in a vehicle?

Accepted Answer

To capture and store fuel vapors from the fuel tank and prevent them from escaping into the atmosphere

Answer

The EVAP system captures hydrocarbon fuel vapors from the fuel tank and routes them to the engine to be burned, preventing VOC emissions from venting to the atmosphere.

Question 3

Which vehicle model year marked the federal requirement for OBD-II compliance on all new light-duty gasoline passenger cars sold in the US?

Accepted Answer

1996

Answer

The US EPA required all new light-duty gasoline passenger cars to be OBD-II compliant beginning with model year 1996, under 40 CFR Part 86.

Question 4

What does a flashing or blinking MIL (Check Engine Light) during an OBD-II inspection indicate?

Accepted Answer

A misfire severe enough to damage the catalytic converter is occurring

Answer

A flashing MIL indicates an active, severe misfire that could cause catalytic converter damage, which is a more urgent condition than a steady MIL.

Question 5

In an OBD-II inspection, what is a 'freeze frame' data record?

Accepted Answer

A snapshot of sensor data captured at the moment a DTC was set

Answer

Freeze frame data is a snapshot of key engine parameters (RPM, load, fuel trim, etc.) that the ECU saves at the instant a Diagnostic Trouble Code is detected.

CEI - Certified Emission Inspector Practice Test

CEI - Certified Emission Inspector Practice Test

CEI CEI Vehicle Inspection & OBD Systems 2