Deck 10: Onboard Diagnosis

Question 1

The OBD II task manager is responsible for ________.

A) controlling the timing of diagnostic tests
B) measuring the coolant temperature
C) calculating spark timing
D) calculating fuel injector timing

Answer 1

A

Question 2

freeze-frame data includes all of the following EXCEPT ________.

A) coolant temperature
B) vehicle speed
C) date of the failure
D) RPM

Answer 2

D

Question 3

A vehicle has a flashing MIL when warmed up and driving. What does this mean?

A) Fuel pressure too low
B) Low tailpipe flow
C) Possible catalytic converter damage
D) OBD II self-test complete

Answer 3

D

Question 4

A freeze-frame is a ________ of all data at the instant an emission-related DTC is set.

A) comprehensive component monitor
B) snapshot
C) failure record
D) trip

Question 5

Enable criteria means ________.

A) the same thing as a trip
B) a warm-up cycle
C) conditions for a particular test to be performed
D) a drive cycle

Question 6

Technician A says that when the MIL is on, the technician should retrieve the DTC and follow the manufacturer's recommended procedure to find the root cause of the problem. Technician B says that all OBD II monitors must have the enable criteria achieved before a test is performed. Who is right?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 7

The MIL is turned off under any of the following conditions, EXCEPT ________.

A) vehicle is driven on 3 consecutive trips with a warm-up cycle, without detecting a fault
B) power to the PCM is disconnected
C) PCM diagnostic link is grounded
D) codes are cleared with a scan tool

Question 8

Technician A says that OBD-II includes generic as well as vehicle manufacturer's specific DTCs and data displays. Technician B says that OBD-II have common DTCs. Who is right?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 9

A U type DTC indicates a problem with ________.

A) body and accessories
B) powertrain
C) communication related systems
D) suspension system

Question 10

An element of the OBD II diagnostic management system which stores engine data during a DTC set is called ________.

A) vehicle in vehicle out
B) memory account
C) misfire
D) freeze frame

Question 11

On-board diagnostic (OBD) systems I and II are being discussed. Technician A says that OBD II systems require misfire detection. Technician B says that OBD I was capable of detecting exhaust emission control system failures. Who is right?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 12

In an OBD II system, when all enabling criteria for a given diagnostic is met, it's considered which of these terms?

A) A tuned engine
B) A trip
C) A warmed-up engine
D) A freeze frame

Question 13

Technician A says that a warm up cycle is a trip where the engine reaches at least 160 degrees F. Technician B says that OBD II requires the diagnostic system to monitor all emission-related components and systems. Who is right?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 14

Which organization(s) developed guidelines for OBD II?

A) EPA and CARB
B) CARB
C) DOT and EPA
D) EPA

Question 15

Which of these is checked during an OBD II PCM initiated functionality test?

A) ECT
B) IAC
C) O2 sensor
D) Brake switch

Question 16

A type C DTC will light the MIL.

Question 17

Setting a type B DTC will also trigger a freeze frame.