Question 1

OBD II provides a universal OBD 16-pin DLC for all manufacturers' vehicles since 1990.

Accepted Answer

OBD II, which became mandatory for all cars and light trucks sold in the United States starting with the 1996 model year, uses a universal 16-pin Data Link Connector (DLC), not since 1990.

Question 2

The two main categories of OBD II monitors are the:
A) KOEO and KOER
B) continuous and noncontinuous
C) emissions and non-emissions
D) related and non-related

Accepted Answer

The two main categories of OBD II (On-Board Diagnostics, second generation) monitors are continuous and noncontinuous. Continuous monitors are always active, checking systems like the fuel system and the comprehensive component monitor. Noncontinuous monitors require certain conditions to be met before they run, such as the catalytic converter and evaporative system monitors.

Question 3

Technician A says not all manufacturers provide freeze frame data.Technician B says one of the mandated features of OBD II is the inclusion of freeze frame data. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Technician B is correct because one of the mandated features of OBD II (On-Board Diagnostics, second generation) is indeed the inclusion of freeze frame data, which captures the engine conditions at the time a fault is detected.

Question 4

OBD II systems are highly efficient and only illuminate the malfunction indicator light (MIL) when an emissions failure has occurred that will raise emission levels 50 percent above the FTP levels.

Accepted Answer

OBD II systems are designed to monitor the performance of emission control systems and illuminate the malfunction indicator light (MIL) when a fault is detected that could increase emissions by 50 percent above the Federal Test Procedure (FTP) standards, ensuring vehicles meet emissions requirements.

Question 5

OBD II systems have been developed to utilize a common set of diagnostic test modes that are accessible with a generic diagnostic scan tool.

Accepted Answer

OBD II (On-Board Diagnostics II) systems are designed to provide standardized diagnostic trouble codes (DTCs) and a set of universal diagnostic test modes that can be accessed with any generic diagnostic scan tool, facilitating the diagnosis and repair of vehicle emissions and engine problems across many different vehicle makes and models.

Question 6

When a DTC is set, the PCM also stores the operating parameters of the emission control system at the time of the event in a data program called:
A) freeze frame
B) system readiness monitor
C) diagnostic trouble code
D) none of the above

Accepted Answer

When a Diagnostic Trouble Code (DTC) is set, the Powertrain Control Module (PCM) stores the operating parameters of the emission control system at the time of the event in a data program called "freeze frame." This allows for later diagnosis of what the vehicle was doing when the fault occurred.

Question 7

Emission controls on modern vehicles produced in the United States are installed to:
A) meet federal and state government regulations
B) meet consumer demand
C) meet international standards
D) improve fuel economy

Accepted Answer

Emission controls on modern vehicles are primarily installed to meet federal and state government regulations aimed at reducing pollutants emitted by vehicles. These regulations are designed to protect the environment and public health by limiting the amount of harmful emissions vehicles can produce.

Question 8

OBD II was mandated by the Federal Environmental Protection Agency to be installed on all passenger vehicles beginning with what model year?
A) 1990
B) 1996
C) 2000
D) 2002

Accepted Answer

The Federal Environmental Protection Agency mandated that OBD II (On-Board Diagnostics, second generation) be installed on all passenger vehicles starting with the 1996 model year to monitor and report on the vehicle's emission performance.

Question 9

OBD II regulations require vehicle manufacturers to use the same terms for the same type of components on all manufacturers' vehicles.

Accepted Answer

OBD II (On-Board Diagnostics II) regulations standardize the terminology and diagnostic codes across all manufacturers, ensuring that the same terms and codes are used for the same components and issues, facilitating easier diagnostics and repairs.

Question 10

Technician A says that the DLC may be located under the hood on an OBD II vehicle. Technician B says that the DLC may be located anywhere that the manufacturer chooses on an OBD II vehicle. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The DLC (Data Link Connector) on an OBD II vehicle is required by law to be located within the passenger compartment, typically under the dashboard on the driver's side, not under the hood or anywhere else the manufacturer chooses.

Question 11

OBD II provides a universal OBD 16-pin DLC for all vehicles manufactured for the U.S. market since 1996.

Accepted Answer

OBD II (On-Board Diagnostics II) mandates a standardized 16-pin Data Link Connector (DLC) for all vehicles manufactured for the U.S. market since 1996, facilitating universal compatibility for diagnostic tools.

Question 12

Technician A says that the DLC on an OBD II vehicle has 18 pins. Technician B says that the pin assignment for the DLC on an OBD II vehicle has not changed since 1996. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The DLC (Data Link Connector) on an OBD II (On-Board Diagnostics II) vehicle actually has 16 pins, not 18, making Technician A incorrect. The pin assignment for the DLC has been standardized since 1996 when OBD II was introduced, but saying it has not changed could be misleading as the statement might imply no updates or revisions, which isn't the case for all aspects of OBD II protocols and standards. However, the basic pinout configuration has remained consistent, making Technician B's statement somewhat accurate but not entirely clear in this context. Therefore, the most accurate answer is that neither technician is completely correct as presented in the question.

Question 13

A generic OBD II diagnostic scan tool cannot access DTCs on all OBD II vehicles.

Accepted Answer

A generic OBD II diagnostic scan tool is designed to access the onboard diagnostics system (OBD II) of any vehicle manufactured from 1996 onwards in the United States, which means it can read Diagnostic Trouble Codes (DTCs) on all OBD II compliant vehicles.

Question 14

ODB II DLC has dedicated pin assignments and location based on SAE standard J1962.

Accepted Answer

The OBD II (On-Board Diagnostics II) Data Link Connector (DLC) indeed has dedicated pin assignments and location as specified by the Society of Automotive Engineers (SAE) standard J1962. This standardization ensures compatibility and uniformity across different vehicle makes and models for diagnostic purposes.

Question 15

Technician A says that all P1XXX DTCs are for manufacturers' specific diagnostic trouble codes. Technician B says that all P0XXX DTCs are for generic diagnostic trouble codes. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

P1XXX codes are indeed manufacturer-specific diagnostic trouble codes, indicating issues that are unique to the make of the vehicle. On the other hand, P0XXX codes are generic diagnostic trouble codes that apply to all makes and models of vehicles, indicating more common issues. Therefore, both Technician A and Technician B are correct.

Question 16

OBD II systems are highly efficient and only illuminate the malfunction indicator light when an emissions failure has occurred that will raise emission levels above 1.5 times the FTP levels.

Accepted Answer

OBD II (On-Board Diagnostics II) systems are designed to monitor vehicle performance and emissions. The malfunction indicator light (MIL), or check engine light, is illuminated when the system detects a problem that could increase emissions beyond 1.5 times the Federal Test Procedure (FTP) standards, indicating a significant emissions failure.

Question 17

A drive cycle refers to a trip in which the operating parameters required for the PCM to run OBD II emissions-related monitors have been met.

Accepted Answer

A drive cycle is a series of operational conditions (speed, temperature, time, etc.) that must be met for the Powertrain Control Module (PCM) to complete its tests or "monitors" for OBD II (On-Board Diagnostics, second generation) emissions-related systems.

Question 18

On an OBD II vehicle, the MIL will turn on when:
A) a condition that could cause emissions levels exceeding 1.5 times the FTP level is detected
B) an input sensor is defective
C) an output sensor is defective
D) all of the above

Accepted Answer

The Malfunction Indicator Lamp (MIL) on an OBD II (On-Board Diagnostics, second generation) vehicle will illuminate for various reasons, including conditions that could cause emissions to exceed 1.5 times the Federal Test Procedure (FTP) standards, as well as when either input or output sensors are found to be defective. This comprehensive approach ensures that any potential issue affecting the vehicle's emissions or performance is promptly indicated to the driver.

Question 19

On an OBD II vehicle, when the ignition key is on and the engine is not running, the MIL should:
A) be off
B) be illuminated
C) flash and then go out
D) be flashing

Accepted Answer

When the ignition key is on and the engine is not running, the Malfunction Indicator Light (MIL) should be illuminated. This is a self-test to show that the light is working.

Question 20

OBD II does not require the inclusion of freeze frame data.

Accepted Answer

OBD II (On-Board Diagnostics II) standards require the inclusion of freeze frame data, which captures specific vehicle operating conditions (such as speed, fuel trim, engine temperature) at the time a fault is detected, to aid in troubleshooting.

Quiz 3: History of on Board Diagnostics Obd

OBD II provides a universal OBD 16-pin DLC for all manufacturers' vehicles since 1990.

The two main categories of OBD II monitors are the:

Technician A says not all manufacturers provide freeze frame data.Technician B says one of the mandated features of OBD II is the inclusion of freeze frame data. Who is correct?

OBD II systems are highly efficient and only illuminate the malfunction indicator light (MIL) when an emissions failure has occurred that will raise emission levels 50 percent above the FTP levels.

OBD II systems have been developed to utilize a common set of diagnostic test modes that are accessible with a generic diagnostic scan tool.

When a DTC is set, the PCM also stores the operating parameters of the emission control system at the time of the event in a data program called:

Emission controls on modern vehicles produced in the United States are installed to:

OBD II was mandated by the Federal Environmental Protection Agency to be installed on all passenger vehicles beginning with what model year?

OBD II regulations require vehicle manufacturers to use the same terms for the same type of components on all manufacturers' vehicles.

Technician A says that the DLC may be located under the hood on an OBD II vehicle. Technician B says that the DLC may be located anywhere that the manufacturer chooses on an OBD II vehicle. Who is correct?

OBD II provides a universal OBD 16-pin DLC for all vehicles manufactured for the U.S. market since 1996.

Technician A says that the DLC on an OBD II vehicle has 18 pins. Technician B says that the pin assignment for the DLC on an OBD II vehicle has not changed since 1996. Who is correct?

A generic OBD II diagnostic scan tool cannot access DTCs on all OBD II vehicles.

ODB II DLC has dedicated pin assignments and location based on SAE standard J1962.

Technician A says that all P1XXX DTCs are for manufacturers' specific diagnostic trouble codes. Technician B says that all P0XXX DTCs are for generic diagnostic trouble codes. Who is correct?

OBD II systems are highly efficient and only illuminate the malfunction indicator light when an emissions failure has occurred that will raise emission levels above 1.5 times the FTP levels.

A drive cycle refers to a trip in which the operating parameters required for the PCM to run OBD II emissions-related monitors have been met.

On an OBD II vehicle, the MIL will turn on when:

On an OBD II vehicle, when the ignition key is on and the engine is not running, the MIL should:

OBD II does not require the inclusion of freeze frame data.