SCT OBD Systems & Diagnostics

Question 1

What does OBD stand for in the context of vehicle emissions testing?

Accepted Answer

On-Board Diagnostics

Answer

Onsite Battery Detector

Answer

Output-Based Diagnostics

Answer

Optical Brake Detection

Question 2

Which OBD generation became mandatory for all gasoline-powered light-duty vehicles sold in the United States starting with model year 1996?

Accepted Answer

OBD II

Answer

OBD I

Answer

OBD III

Answer

EOBD

Question 3

Which OBD II readiness monitor specifically checks the integrity of the fuel tank vapor recovery system?

Accepted Answer

EVAP monitor

Answer

Oxygen sensor monitor

Answer

Catalyst monitor

Answer

EGR monitor

Question 4

What does it mean when an OBD II readiness monitor shows a status of 'not ready' or 'incomplete'?

Accepted Answer

The vehicle's computer has not yet completed its self-test for that system

Answer

The vehicle has a confirmed fault in that system

Answer

The monitor is permanently disabled on this vehicle

Answer

The MIL must be illuminated for that system

Question 5

In California, how many OBD II readiness monitors may show 'not ready' for a 2000 model year vehicle to still pass the smog inspection?

Accepted Answer

Two monitors may be incomplete

Answer

Zero — all monitors must be ready

Answer

One monitor may be incomplete

Answer

Three monitors may be incomplete

Question 6

What is the Malfunction Indicator Lamp (MIL) commonly known as to most vehicle owners?

Accepted Answer

Check Engine light

Answer

Battery warning light

Answer

Oil pressure warning light

Answer

Temperature warning light

Question 7

What happens to a vehicle's OBD II readiness monitors when a technician clears diagnostic trouble codes using a scan tool?

Accepted Answer

All monitors reset to 'not ready' status

Answer

The monitors remain in their current ready status

Answer

Only the monitor related to the cleared code resets

Answer

The monitors reset only if the battery is also disconnected