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Electronic Fuel Systems > 190204a > Flashcards

190204a Flashcards

0
Q

True or false. Vehicle speed sensor’s and engine RPM sensors provide a variable frequency signal to the CM. The signals can be used to operate a speedometer or Tachometer

A

True

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1
Q

Pressure sensors are typically wired to the ECM using how many wires in the circuit

A

Pressure sensors are typically wired to the ECM with a three wire circuit

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2
Q

True or false. When a coolant level sensor probe is installed in the radiator, the coolant forms a path for current to flow between the two terminals of the probe.

A

True. liquid completes the circuit

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3
Q

A typical throttle position sensor uses a potentiometer to provide the ECM with the variable DC voltage signal that varies between what volts

A

0.5 V DC at idle and 4.5 V DC at full throttle

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4
Q

What are three forms of diagnostic information generated by the ECM

A

Fault codes, flash codes and diagnostic trouble codes

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5
Q

True or false. SAE has developed a generic fault code system. This system enables you to retrieve similar information regardless of the fault code systems used by different engine manufacturers

A

True

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6
Q

True or false. fault codes can only be generated to indicate engine protection problems

A

False. Fault codes can be generated to indicate engine protection problems and electronic system problems

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7
Q

True or false. Warning lights are output devices and are part of the engine protection system

A

True. Warning lights are located on the dash panel to alert the operator when I monitored system has developed a problem

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8
Q

Using a laptop how would you would adjust low idle speed up.

A

Reprogram the idle speed setting within a fixed set of parameters.

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9
Q

True or false. electronic control systems typically have programmable parameters that can be changed to tailor system operation and meet customer requirements

A

True.

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10
Q

A TPS ( throttle position sensor) is

** on test**

A

A potentiometer device the provides ECM with electrical signal proportional to the amount of pedal depresstion

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11
Q

What are three purposes of engine warning lights

A

Alert the operator of a problem affecting engine performance, indicate engine danger or damage if left unchecked, used to retrieve diagnostic trouble codes

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12
Q

What are two diagnostic instruments that can be attached to the DDL connector

A

Hand held Scan tool or computer with the appropriate adapters

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13
Q

And electrical open in a temperature sensor circuit would produce a trouble code indicating that the sensor circuit voltage is what?

A

Higher than the normal range of sensor values

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14
Q

What information would the ECM provide for a fault if an electrical SHORT developed in a temperature sensor circuit.

A

The ECM would create an active code indicating the sensor circuit voltage is “LOW”

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15
Q

Typically can customer adjustable parameters exceed set values that are established by the engine manufacture.

A

Not a chance. Customers can only adjust within those parameters

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16
Q

What equipment would you need to interface with the ECM

A

And adapter cable, a communication adapter and the appropriate software loaded on the PC

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17
Q

A temperature sensor is also called a

A

Thermistor

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18
Q

a thermister has _____ resistance when cold, and has ________ resistance when hot

A

High

Low

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19
Q

A pressure sensor is a

A

3 terminal device
1 wire connected to 5volt DC
2 wire connected to sensor return or ground
3 wire signal wire to ECM

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20
Q

A speed sensor or reluctance type is

A

Commonly use to provide the ECM with info on RPM ( tachometers) or vehicle speed( speedometers)

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21
Q

Generally speaking what manuals in electronic format would you get as part of the engine manufacturers diagnostic software package

A

Service and troubleshooting manual

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22
Q

What are some factors that determine the frequency from the vehicle speed sensor VSS

A

Rear axle ratio, tire revolutions per mile based on tire size, number of teeth on the transmission output shaft pulse wheel and top gear ratio of the transmission

23
Q

Cruise control speed settings are based on the frequency of what signal device

A

Vehicle speed sensor. VSS

24
Q

Before working on electronic equipment what are two possible ways you can discharge static electricity

A

Touch a ground surface or attach a grounding strap to the vehicle frame and yourself while working

25
Q

What three options can typically be selected to determine the level of engine protection

A

Warning, de-rate, shut down

26
Q

Fuild level sensor does what

A

Detect the operating levels of coolant or oil.

27
Q

Cruise control speed settings are based on the frequency of the signal from what kind of sensor?

A

(VSS) Vehicle speed sensor

28
Q

What are the benefits of an electronic fuel control system?

A
  • improved throttle response
  • improved cold starting and warm up characteristics
  • less mechanical linkages and components
  • engine warning and shut down systems can be integrated
29
Q

What does a basic electronic control system consist of?

A
  • input devices
  • ECM
  • output devices
30
Q

Senses, switches, and data links are all examples of?

A

Input devices (provide signals to ECM)

31
Q

True or False? Engine RPM, vehicle speed, and oil pressure are all monitored by actuators?

A

False. Actuators are output devices

32
Q 
An Electronic Control Module contains which of the following?
A) Central processing unit (CPU)
B) input sensors
C) actuators
D) All of the above
A

A. The others interact with the ECM

33
Q

True or False?

RAM memory is referred to as a type of read/write memory

A

Thus is true donkey

And it’s volatile. Loss of power can wipe it out.

34
Q

Technicians can access ECM operation by connecting a scan tool or PC to the… ?

A

Data Link Connector

35
Q

True or False? EPROM Memory can be reprogramed while the EPROM memory chip is still installed in the ECM.

A

False.

EEPROM can be reprogrammed while in the ECM

36
Q

True or false? The Electronic control system can perform functions previously handled through mechanical and hydraulic governors.

A

True

37
Q

Multiplexing (networking) is used to connect computer controlled systems. What else do they allow for?

A
  • Simplified engine diagnostics
  • Less complex than older systems
  • Information can be shared between computer modules
38
Q

What is the definition of Baud rate?

A

The speed of communication between the modules

39
Q

Define protocol relating to electronic control systems

A

Protocol refers to the common language used between the modules.

40
Q

What’s an actuator

A

An output device that receives signals from the ECM

41
Q

True or false

Digital signal is either on or off between two fixed voltages

A

True

Usually between 0 to 5 volts with ECM circuits

42
Q

What’s a parameter

A

Programmable feature, value or instruction that affects operation characteristics of an engine

43
Q

What are sensors

A

Sensors and input devices that monitor pressure, temperature, fluid levels and mechanical movements

44
Q

What are the components of a basic electronic control system

A

Input sensors
ECM
Output devices

45
Q

Three basic functions of the warning system?

A

1-to warn the operator of an engine or system malfunction
2-to de-rate or shut down the engine when damaging conditions exist
3-to generate fault codes to assist system diagnosis

46
Q

Three levels of engine protection I can be programmed into the ECM?

A

1-warning only
2-warning and de-rate
3-warning, de-rate, and shut down

47
Q

The ECM compares sensor information with stored parameters to determine?

A

The ECM compare sensor information with stored parameters to determine when An electronic system or engine problem exists

48
Q

The two basic types of diagnostic code systems used are?

A

Engine manufacturer fault codes

Society of automotive engineers (SAE) fault codes

49
Q

Engine manufacturer codes can be separated into 2 sections

A

Engine protection codes

System fault detection codes

50
Q

Engine protection codes deal with faults that will cause engine damage or failure such as

A 
Low oil pressure 
high oil temperature 
high coolant temperature 
Low oil level
low coolant level
High inlet air temperature
51
Q

Why was the SAE fault code system developed?

A

The S a E fault code system was developed to standardize the fault code numbering system throughout the industry. the benefit of the system is that basic diagnostics can be performed using a standard set of codes regardless of engine manufacturer.

52
Q

What is FMI?

A

Failure mode identifier - this identifies The type of failure occurring such as voltage low, voltage high, or data out of range. FMI failures are identified by a 2 digit numeral ranging from approximately 00 to 14

53
Q

What is SID?

A

System identification - This identifies the operating system affected such as engine position sensor throttle position sensor coolant temperature sensor SID failure types are identified by three digit numeral from approximately 000 to 300

54
Q

What is PID?

A

Parameter identification - this identifies a specific parameter affected such as engine oil pressure coolant temperature and turbo boost PID failure types are identified by a three digit numeral from approximately 000 to 300

55
Q

The ECM generates diagnostic trouble codes based on what two sources of information?

A

Information from the sensor circuit

Set values programmed into the ECM’s memory

56
Q

When is an engine protection fault code generated?

A

An engine protection fault code is generated when ever the sensor signal value is out of range during specific engine conditions

Electronic Fuel Systems (5 decks)

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