OBD II Test Prep

Question 1

After a vehicle repair STFT is -18% and LTFT is +18%. This indicates...

Accepted Answer

The fuel system was lean but is now normal

Question 2

When the FUEL TRIM values of both banks read out of specification and similar, what type of problem is occurring?

Accepted Answer

A bad fuel pump or MAF sensore could be at fault

Question 3

What is the advantage to NOT clear the DTC's after a repair?

Accepted Answer

Allof the above

Question 4

Tech A says OBD I was primarily an engine management system. Tech B says OBD II is an emission testing system.

Accepted Answer

Both techs are right

Question 5

Continuous monitors are the hardest to run.

Accepted Answer

False

Question 6

The purpose of a Drive Cylce is...

Accepted Answer

To run all monitors

Question 7

A DTC is generated when...

Accepted Answer

A monitor runs and sees a problem

Question 8

A monitor won't run. Tech A says its' OK on a car w/ no problems. Tech B says a car isn't fixed until all monitors run

Accepted Answer

Tech B is right

Question 9

Non-continuous monitors usually involve start and run the engine, that's about it.

Accepted Answer

False

Question 10

Negative Fuel Trim numbers are a result of a system that is running rich.

Accepted Answer

True

Questions 10