In what year did it become mandatory for all vehicles to be on-board diagnostic II (OBDII) compliant?

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When a vehicle's malfunction indicator lamp (MIL), formerly called a "check engine light," is illuminated, it means the vehicle is not complying with clean air regulations.

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If the MIL flashes, it indicates that the:

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Tech A says that monitors are designed to test if emission systems are working properly. Tech B says that monitors are designed to store sensor data about a fault if a DTC is set. Who is correct?

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When misfires occur, the full volume of air and fuel from the misfiring cylinder is burned in the __________.

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______ monitors the system for leaks as well as the ability to purge the canister of vapors.

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Which operating mode of the OBD II system shows current data?

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Tech A states that simple scan tools from the 1980's could read and erase fault codes. Tech B states that modern scan tools can display sensor data in a graphical format. Who is correct?

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The OBDII system constantly tests and analyzes each system's performance through a set of PCM programs called ________.

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Tech A says that on OBDII vehicles, it is a good idea to clear the codes before diagnosis, and see if they reset. Tech B says that the DTC will tell you what part needs to be changed. Who is correct?

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The data link connector (DLC) is an 8-pin connector with a common (SAE J1962) size and shape.

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On-board diagnostic (OBD) systems help the service tech do all of these EXCEPT:

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A fault code that begins with the letter "B" would MOST likely address a fault in the:

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An evaporative emission (EVAP) monitor will not run if the fuel tank is nearly full or nearly empty.

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If the first character of the DTC is U, it indicates that the fault is located within the:

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A scan tool detects a communications fault in the controller area network bus (CAN-bus). Which of these diagnostic trouble codes (DTC's) would MOST likely be stored?

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The engine misfire monitor directly detects a fault by monitoring:

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Onboard computer modules include all of the following EXCEPT the:

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Why is it important to run the monitors after repair?

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Diagnostic data should be deleted before all testing has been completed.

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To simplify wiring, controller area networks (CANs) have become common place in today's vehicles.

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Difficult-to-find intermittent faults can be diagnosed by carefully reviewing ______ data stored just before, during, and after the fault occurred.

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A monitor is a computer's test of its system components and circuits for malfunctions that would cause emissions to increase _______ times more than FTP (Federal Test Procedures) regulations allowed.

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Each of the 10 operating modes of the OBD II system allows for access to different data. Which mode is used to clear DTCs and stored values?

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When it comes to troubleshooting an on-board diagnostic (OBD) code, the tech's best tools include all of these EXCEPT:

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A drive cycle includes all of these EXCEPT:

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Tech A says that the MIL can turn off if the fault doesn't reappear in three sequential trips. Tech B says that when an MIL is activated, the PCM stores the DTC until a predetermined number of drive cycles automatically erase the DTC or if cleared manually by a scan tool. Who is correct?

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Automotive technicians today are finding that they must use faster and more accurate diagnostic instruments, such as ________ scan tools, to see hidden faults in component or system wave forms.

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Bidirectional scanners:

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