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EMS-D All Chapters Studied > Week 1, Chapter 64 - OBD > Flashcards

Week 1, Chapter 64 - OBD Flashcards

1
Q

What light is illuminated when a vehicle has identified a fault that is likely causing it not to comply with clean air regulations?

A

Check Engine Light

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2
Q

The ____ runs the engine management systems through self-tests at engine start-up and continues to monitor the systems once underway

A

PCM

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3
Q

What kind of computers monitor systems and components and inform vehicle operator when a fault occurs?

A

Onboard Diagnostic (OBD) Systems

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4
Q

Which OBD generation includes these…
- Became nationwide in 1981
- Allowed each vehicle manufacturer to have its own OBD system
- No set standards for DTC’s
- Basic information from a scan tool
- Flash diagnostics

A

OBD I

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5
Q

Which OBD generation includes these…
- Operate under standards set by SAE
- Standardized nationwide in 1996
- Constantly monitor and manage the engine management system

A

OBD II

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6
Q
  • Sensor data can be accessed with a scan tool
  • Scan tool can be used to access the information from any sensor in the system
  • All of the sensor data can be examined while diagnosing faults

These this are all included in what?

A

Data Stream, or Parameter Identification (PID)

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7
Q

A ____________ is a localized vehicle network that enables computers and components to send and receive signals across a shielded twisted pair of wires

A

CANbus

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8
Q

What kind of wires are shielded by being twisted around one another and carry balanced signals between modules?

A

Twisted Pair Wires

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9
Q

An ignition cycle in which the key is turned on, a monitor runs, the key is turned off and the PCM powers down

A

Trip

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10
Q

A trip when the engine is started and run until the engine operating temperature reaches 160°F and has increased in temperature at least 40°F and the engine is turned off again

A

Warm-up Cycle

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11
Q

When all monitors have run and passed (this may take a very long time)

A

Drive Cycle

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12
Q

Conditions that must be met for a monitor to run such as certain temperatures, speed, what the sensor is being used for at the time, etc.

A

Enabling Criteria

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13
Q

The conditions that were occurring when a monitor failed

A

Similar Conditions Window

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14
Q

A snapshot of parameters taken on the first failure of a monitor

A

Freeze Frame Data

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15
Q

Live data or freeze frame data that provides sensor and actuator information to the technician

A

Parameter Identification (PID)

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16
Q

_____________________ is a list of sensor data that are associated with a specific DTC and is listed in order of highest priority to lowest priority DTC’s

A

Freeze Frame Data

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17
Q

___________ indicate the component or circuit in which a fault has been detected and are stored in one or more of the vehicle’s electronic control modules

A

Diagnostic Trouble Codes (DTCs)

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18
Q

Once the MIL is on, it will remain on until either the technician clears the codes, or the fault has not been detected during ____ consecutive trips when the monitor is run without failure

A

3

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19
Q

Pending/current codes that have happened in the past, but haven’t been cleared manually with a scan tool, and will stay for up to 80 warm up cycles depending on the severity of the fault

A

History Codes

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20
Q

_________ DTC’s are priority. These set the check engine light on the first failure of a monitor, and if the problem is severe enough, the check engine light will flash in order to alert the driver that there is something causing damage to the emission control systems of the vehicle.

A

Type A

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21
Q

_________ DTC’s are generally a two-trip fault in which freeze frame data is set on the first failure of a monitor and on the second failure, the MIL is illuminated

A

Type B

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22
Q

________ DTC’s are non-priority for emissions. These include:
- ABS, TCS, Restraints, Oil change reminders, maintenance reminders, etc.

A

Type C

23
Q

Position 1 of a DTC determines the…

A

Major System at fault

24
Q

Position 2 of a DTC determines the…

A

Determination

25
Q

Position 3 of a DTC determines the…

A

System that is failing

26
Q

Position 4/5 of a DTC is the…

A

Serial numbering of the individual components or systems

27
Q
  • Misfire monitor
  • Fuel System monitor
  • Continuous component monitor

These are examples of…

A

High priority faults

28
Q
  • Catalytic converter monitor
  • Heated catalyst monitor
  • Oxygen sensor monitor
  • Oxygen sensor heater monitor
  • Evaporative system monitor
  • EGR system monitor
  • Secondary air system monitor

These are all examples of…

A

Lower priority faults

29
Q

________________ monitors are run only once during each engine warm-up cycle, or even less often

A

Non-continuous

30
Q

A _________ is defined as a lack of combustion

A

Misfire

31
Q

The PCM uses the __________________ to tell which cylinder(s) are misfiring or if it is a random misfire

A

Camshaft Position Sensor (CMP)

32
Q

If the monitor detects misfires between the lower and upper threshold, a “______________” will be set, and freeze-frame data may be stored

A

Pending DTC

33
Q

_________ monitors the amount of correction needed to keep the air-fuel mixture correct

A

Fuel System Monitor (Continuous)

34
Q

Base fuel trip is considered __% as a scan tool value

A

0%

35
Q

_____________ fuel trim numbers indicate the PCM is adding fuel compared to the base fuel trim. This indicates a lean condition.

A

Positive

36
Q

__________ fuel trim numbers indicate the PCM is taking away fuel compared to the base fuel trim. This indicates a rich condition

A

Negative

37
Q

The largest overall monitor is the _____

A

Comprehensive Components Monitor (CCM)

38
Q

A CCM checks inputs for ___________

A

Rationality

39
Q

A CCM checks outputs for ______________

A

Functionality

40
Q

What component monitors and controls exhaust emissions?

A

Oxygen Sensor Monitor

41
Q

What is it called when the engine PCM uses the oxygen sensor signal for correction of the A/F ratio

A

Closed Loop Operation

42
Q

What is it called when the engine ECU does not use the oxygen sensor signal for correction of the A/F ratio

A

Open Loop Operation

43
Q

A properly operating ___________________ must:
- generate a signal below a specified low voltage and above a specified high voltage
- change voltage quickly

A

Oxygen Sensor

44
Q

What does the OBD II monitor also measure during a short time period?

A

The rich-lean switching frequency of the oxygen sensor output

45
Q

Doing what to the oxygen sensors can get them into operation much sooner?

A

Heating them up

46
Q

If the time for the oxygen sensor to operate is too long on two consecutive drive cycles, what happens?

A

A DTC is set

47
Q

What component reduces pollutants in the exhaust system?

A

Catalytic Converter Monitor

48
Q

To run the ________, the engine must typically be below a specified temperature, and the fuel level must be between 1/4 and 3/4 full

A

EVAP Monitor

49
Q

The EVAP monitor draws a vacuum on the EVAP system, seals it off, and then monitors the pressure to determine what?

A

If there are any leaks

50
Q

What component monitors the flow of Exhaust Gas Recirculation gases when the valve is commanded open?

A

EGR System Monitor

51
Q

EGR system monitor is run after the engine is fully ________ and has met other specified conditions based on the type of monitoring sensor used

A

Warmed up

52
Q

What are the most common EGR monitoring sensors used to determine operation?

A
  • EGR temperature sensor method
  • MAP sensor method
  • Oxygen sensor method
53
Q

What is able to electronically communicate with and extract data from the vehicle’s one or more onboard computers?

A

Scan Tools

54
Q

What kind of scanners are used to send commands to the

A

Bidirectional Scanners

EMS-D All Chapters Studied (11 decks)

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