28-33, 37

Front 1

The sensor that most determines fuel delivery when a fuel-injected engine is first started is the:

A: OS2

B; ECT Sensor

C;Engine MAP Sensor

D; IAT Sensor

Back 1

D: IAT Sensor

Front 2

What happens to the voltage measured at the ECT sensor when the thermostat is closed

A; Increases Slightly

B; Increases about 1 volt

C; Decreases Slightly

D; Decreases about 1 volt.

Back 2

A; Increases Slightly

Front 3

Two technicians are discussing a stepped ECT circuit. Tech A says that the sensor used for a stepped-circuit is different than one used in a non-stepped circuit. Tech B says that a stepped ECT circuit uses different internal resistance inside the PCM. Which technician is correct?

A; Technician A Only

B; Technician B Only

C; Both Tech A and B

D; Neither Technician A nor B

Back 3

B; Technician B only

Front 4

When testing an ECT sensor on a vehicle, a digitial multimeter can be used and the signal wires back probed. What setting should the technician use to test the sensor?

A; AC volts

B; DC volts

C; Ohms

D; Hz (Hertz)

Back 4

B; DC volts

Front 5

When testing the ECT sensor with the connector disconnected, the technician should select what position on the DMM?

A; AC volts

B; DC volts

C; Ohms

D; Hz (Hertz)

Back 5

C; Ohms

Front 6

When clicking the ECT sensor with a scan tool, about what temperature should be displayed if the connector is removed from the sensor with the key on, engine off?

A; 284F, 140C

B; 230F, 110C

C; 120F, 50C

D; -40F, -40C

Back 6

D; -40F, -40C

Front 7

Two technicians are discussing the IAT sensor. Tech A says that sensor is more important to the operation of the engine (higher authority) than the ECT sensor. Technician B says that the PCM will add fuel if the IAT indicates that the incoming air temperature is cold. Which technician is correct?

A; Tech A

B; Tech B

C; Tech A and B

D; Tech A nor B

Back 7

B; Tech B

Front 8

A typical IAT or ECT sensor reads about 3,000 ohms when tested using a DMM. This resistance represents a temperature of about:

A: -40F, -40C

B; 70F, 20C

C; 120F, 50C

D; 284F, 140C

Back 8

B; 70F, 20C

Front 9

If the transmission fluid temperature sensor (TFT) indicates cold automatic transmission fluid temperature, what would the PCM do to the shifts?

A; Normal shifts and normal operation of the torque converter clutch.

B; Disable torque converter clutch, normal shift points.

C; Delayed shift points and torque converter clutch disabled.

D; Normal shifts but overdrive will be disabled

Back 9

C; Delayed shift points and torque converter clutch disabled.

Front 10

A P0118 DTC is being discussed. Tech A says that the ECT sensor could be shorted internally. Tech B says that the signal wire could be open. Which tech is correct?

A

B

C

D

Back 10

B; Tech B

Front 11

Which sensor is generally considered to be the electronic accelerator pump of a fuel injected engine?

A; Os2

B; ECT sensor

C; Engine MAP sensor

D; TP sensor

Back 11

D; TP sensor

Front 12

Typical TP sensor voltage at idle is about:

A; 2.50 to 2.80v

B; 0.5 volt or 10% of WOT TP sensor voltage

C; 1.5 to 2.8v

D; 13.5v to 15v

Back 12

B; 0.5v or 10% of WOT TP sensor voltage.

Front 13

A TP sensor is what type of sensor?

A; Rheostat

B; Voltage generating

C; Potentiometer

D; Piezoelectric

Back 13

C; Potentionmeter

Front 14

Most TP sensors have how many wires?

A: 1

B; 2

C; 3

D; 4

Back 14

C; 3

Front 15

Which sensor does the TP sensor back up if the PCM determines that that a failure has occured?

a; Oxygen sensor

b; MAF sensor

c; MAP sensor

d; either b or c

Back 15

D; either b or c

Front 16

Which wire on a TP sensor should be back probed to check the voltage signal to the PCM?

a; 5 volt reference (VRef)

b; signal

c; ground

d; meter should be connected between the 5 volt reference and the ground

Back 16

b; signal

Front 17

After a TP sensor has been tested using the MIN/MAX function on the DMM, a reading of zero volts is displayed. What does this reading indicate?

A; The TP sensor is open at one point during the test.

B; The TP sensor is shorted

C; The TP sensor signal is shorted to 5 volt reference.

D; Both B and C are possible.

Back 17

A, The TP sensor is open at one point during the test.

Front 18

After a TP sensor has been tested using the MIN/MAX function on a DMM, a reading of 5 volts is displayed. What does this reading indicate?

A: The TP sensor is open at one point during the test.

B; The tp sensor is grounded.

C; The ZTP sensor signal is shorted to 5 volt reference.

D; Both B and C are possible

Back 18

C; The TP sensor signal is shorted to 5 volt reference.

Front 19

A technician attaches one lead of a digital voltmeter to the ground terminal of the TP sensor and the other meter lead to the negative terminal of the battery. The ignition is switched to on, engine off, and the meter displays 37.3mV. Tech A says that this is the signal voltage and is a little low. Tech B says that the TP sensor ground circuit has excessive resistance. Which tech is correct?

A;

B;

C;

D;

Back 19

D; Neither Technician are correct.

Front 20

A P0122 DTC is retrieved using a scan tool. This DTC means:

A; The TP sensor voltage is low.

B; The TP sensor could be shorted

C; The TP sensor signal circuit could be shorted-to-ground

D; All of the above.

Back 20

D; All of the above.

Front 21

As the load on an engine increases, the manifold vacuum decreases and the manifold absolute pressure

A; Increases

B; Decreases

C; Changes with barometric pressure only (attitude or weather)

D; Remains constant.

Back 21

A; Increases

Front 22

A typical MAP sensor compares the vacuum in the intake manifold to:

A; Atmospheric pressure

B; A perfect vacuum

C; Barometric pressure

D; the value of the IAT sensor

Back 22

B; A perfect vacuum

Front 23

Which statement is false:?

A: Absolute pressure is equal to barometric pressure plus intake manifold vacuum.

B; A decrease in manifold vacuum means an increase in manifold pressure.

C; The MAP sensor compares manifold vacuum to a perfect vacuum

D; Barometric pressure minus the MAP sensor reading equals intake manifold vacuum.

Back 23

A; Aboslute pressure is equal to barometric pressure plus intake manifold vacuum

Front 24

Which design of MAP sensors produces frequency output signal?

A; silicon diaphram strain gauge

b; piezoresistivity design

c; capacitor-capsule

d; ceramic disc

Back 24

C; capacitor-capsule

Front 25

The frequency output of a digital MAP sensor is reading 114 Hz. What is the approximate engine vacuum?

a; zero

b; 5 inc Hg

c; 10 inch Hg

d; 15 inch Hg

Back 25

d; 15 inch Hg

Front 26

Which is not a purpose or function of the MAP sensor?

a; Measures the load on the engine

b; Measures engine speed

c; calculates fuel delivery based on altitude.

d; helps diagnose the EGR system

Back 26

b; measures engine speed.

Front 27

When measuring the output signal of a MAP sensor on a General Motors vehicle, the digital multimeter should be set to read:

a; DC V

b; AC V

c; Hz

d; DC A

Back 27

a; DC V

Front 28

Two technicians are discussing testing MAP sensors. Tech A says taht the MAP sensor voltage on a GM vehicle at idle should be about 1.0 volt. Tech B says that the MAP sensor frequency on a Ford vehicle at idle should be about 105 to 108 Hz. Which technician is correct?

A;

B;

C;

D;

Back 28

C; Both

Front 29

Tech A says that MAP sensors use 5v reference voltage from the PCM. Tech B says that the MAp sensor voltage will be higher at idle at high altitudes compared to when the engine is operating at near sea level.

Which tech is correct?

A;

B;

C;

D;

Back 29

A; Tech A

Front 30

A P0107 is being discussed. Tech A says that a defective MAP sensor could be the cause. Tech B says that a MAP sensor signal wire shorted-to-ground could be the cause. Which tech is correct?

A;

B;

C;

D;

Back 30

C;

Front 31

A fuel injection system that does not use a sensor to measure the amount (or mass) of air entering the engine is called a X type of system.

a; air vane controlled

b; speed density

c; mass airflow

d; hot wire

Back 31

b; speed density

Front 32

Which type of sensor uses a burn off circuit?

a; Hot wire MAF sensor

b; hot film MAF sensor

c; vane type airflow sensor

d; both a and b

Back 32

a; hot wire MAF sensor

Front 33

which sensor has a switch that controls the electric fuel pump?

a; VAF

b; Hot wire MAF

c; Hot filter

d; karman vortex sensor.

Back 33

a; VAF

Front 34

Two techs are discussing karman vortex sensors. Tech A says that they contain a burn off circuit to keep them clean. Tech B says that they contain a moveable vane. Which tech is correct?

A;

B;

C;

D;

Back 34

D; Neither

Front 35

The typical MAF reading on a scan tool with the engine at idle speed and normal operating temperature is______:

A; 1 to 3g per second

b; 3 to 7g per second

c; 8 to 12g per second

d; 14 to 24g per second

Back 35

b; 3 to 7g per second.

Front 36

Two techs are diagnosing a poorly running engine. There are no diagnostic trouble codes. When the MAF sensor is unplugged, the engine runs better. Tech A says that this means that the MAF is supplying incorrect airflow information to the PCM. Tech B says that this indicates that the PCM is defective. Which tech is correct?

a;

b;

c;

d;

Back 36

A; Tech A

Front 37

A MAF sensor on a GM 3,800 V-6 is being tested for contamination. Tech A says that the sensor should show over 100 grams per second on a scan tool display when the accelerator is depressed to WOT on a running engine. Tech B says that the output frequency should not exceed 7,000 Hz when the accelerator pedal is depressed to WOT on a running engine. Which technician is correct?

A;

B:

C;

D;

Back 37

C; Both

Front 38

Which airflow sensor has a dampening chamber?

A; A Vane airflow

b; a hot film MAF

c;' a hot wire MAF

d; a karman vortex

Back 38

A; a vane airflow

Front 39

Air that enters the engine without passing through the air flow sensor is called

a; bypass air

b; dirty air

c; false air

d; measured air

Back 39

c; false air

Front 40

A P0102 DTC is being discussed. Tech A says that a sensor circuit shorted-to-ground can be the cause. Tech B says that an open sensor voltage supply circuit could be the cause. Which tech is correct?

a;

b;

c;

d;

Back 40

C; both techs

Front 41

The voltage output of a zirconia oxygen sensor when the exhaust stream is lean (+ air) is:

a; relatively high (close to 1 volt)

b; about in the middle of the voltage range

c; relatively low (close to 0 volt)

d; either a or b, depending on the atmospheric pressure

Back 41

c; relatively low ( close to 0 volt )

Front 42

A high O2S voltage could be due to a:

a; rich exhaust

b; lean exhaust

c; defective spark plug wire

d; both a and c

Back 42

A; rich exhaust

Front 43

A low O2S voltage could be due to a:

a; rich exhaust

b; lean exhaust

c; defective spark plug wire

d; both b and c

Back 43

d; both b and c

Front 44

An oxygen sensor is being tested with a digital multimeter (DMM) using the MIN/MAX function. The readings are: Min: 78mV, Max 932mV; Avg: 442mV. Tech A says that the engine is operating correctly. Tech B says that the oxygen sensor is skewed too rich. Which tech is correct?

a;

b;

c;

d;

Back 44

a; tech A

Front 45

An oxygen is being tested using a digital storage oscilloscope (DSO). A good oxygen sensor should display how many transitions per second?

a; 1-5

b; 5-10

c; 10-15

d; 15-20

Back 45

a; 1-5

Front 46

a wide band oxygen sensor was first used on a Honda in what model year?

a; 1992

b; 1996

c; 2000

d; 2006

Back 46

a; 1992

Front 47

a wide band oxygen sensor is capable of detecting the air fuel mixture in the exhaust from X (rich) to X (lean)

a; 12:1, 15:1

b; 13:1, 16.7:1

c; 10:1, 23:1

d; 8:1, 18:1

Back 47

c; 10:1, 23:1

Front 48

a wide band oxygen sensor needs to be heated to what operating temperature?

a; 600F, 315C

b; 800F, 427C

c; 1400F, 760C

d; 2000F, 1093C

Back 48

C; 1400F, 760C

Front 49

a wide band oxygen sensor heater could draw how much current?

a; 0.8 to 2A

b; 2 to 4A

c; 6 to 8A

d; 8 to 10A

Back 49

d; 8 to 10A

Front 50

A P0133 DTC is being discussed. Tech A says that a defective heater circuit could be the cause. Tech B says that a contaminated sensor could be the cause. Which is correct?

a;

b;

c;

d;

Back 50

C; Both Techs

Front 51

The primary ignition system must be working correctly before any spark occurs from the coil. Which component is not in the primary ignition coil.

a; spark plug wiring

b; ignition module (igniter)

c; pick up coil (pulse alternator)

d; ignition switch

Back 51

a; spark plug wiring

Front 52

The ignition module has direct control over the firing of the coils of an ignition system. Which component triggers controls the module?

a; pick up coil

b; computer

c; crankshaft sensor

d; all of the above

Back 52

d; all of the above

Front 53

distributor ignition system can be triggered by a:

a; hall effect sensor

b; magnetic sensor

c; spark sensor

d; either a or b

Back 53

d; either A or B

Front 54

ignition coil primary resistance is usually ___ ohms.

a; 6000 to 30000

b; 150 to 1500

c; less than 1 to 3

d; either a or b

Back 54

c; less than 1 to 3

Front 55

coil polarity is determined by the ____:

a; direction of rotation of the coil winding

b; turn ratio

c; directions of laminations

d; saturation direction

Back 55

a; direction of rotation of the coil windigns

Front 56

a compression-sensing ignition system uses a ___ type of ignition.

a; distributor

b; coil on plug

c; waste spark

d; all of the above

Back 56

c; waste spark

Front 57

the pulse generator_______

a; fires the spark plug directly

b; signals the electronic control unit

c; signals the computer that fires the spark plug directly

d; is used as a tachometer reference signal by the computer and has no other function

Back 57

b; signals the electronic control unit (module)

Front 58

two techs are discussing coil on plug ignition systems. Tech A says that they can be called coil near plug or coil by plug ignition systems. Tech B says that some can use ion sensing. Which technician is correct?

a; tech a

b; tech b

c; both

d; neither

Back 58

c; both

Front 59

a waste spark type ignition system fires:

a; two spark plugs at the same time

b; one spark plug with reverse polarity

c; one spark plug with straight polarity

d; all of the above

Back 59

d; all of the above

Front 60

Tech A says that a defective crankshaft position sensor can cause a no spark condition. Tech B says that a faulty ignition control module can cause a no spark condition. Which technician is correct

a;

b;

c;

d;

Back 60

c; both

Front 61

The use of an electronic throttle control (ETC) system allows the elimination of all except___

a; accelerator pedal

b; mechanical throttle cable (most systems)

c; cruise control actuator

d; idle air control

Back 61

a; accelerator pedal

Front 62

The throttle plate is spring loaded to hold the throttle slightly open how far?

a; 3 to 5%

b; 8 to 10%

c; 16 to 20%

d; 22 to 28%

Back 62

c; 16 to 20%

Front 63

The throttle plate actuator motor is what type of electric motor?

a; stepper motor

b; DC motor

c; AC motor

d; brushless motor

Back 63

b; DC motor

Front 64

The actuator motor is controlled by the PCM through what system?

a; Series

b; Parallel

c; H-Bridge

d; Series-Parallel

Back 64

c; H-Bridge

Front 65

When does the PCM perform a self-test of the ETC system?

a; during cruise speed when the throttle is steady

b; during deceleration

c; during acceleration

d; when the ignition switch is first rotated to the on position before the engine starts

Back 65

d; when the ignition switch is first rotated to the on position before the engine starts

Front 66

The throttle position sensor used in the throttle body assembly of an ETC is what type?

a; single potentionmeter

b; two potentiometer that read in the opposite direction

c; hall-effect sensor

d; either b or c

Back 66

d; either b or c

Front 67

A green wrench symbol is displayed on the dash. What does this mean?

a; a fault in the ETC in a Ford is detected

b; a fault in the ETC in a Honda is detected

c; a fault in the ETC in a Chrysler is detected

d; a fault in the ETC in a GM vehicle has been detected

Back 67

a; a fault in the Ford

Front 68

A technician is checking the operation of the ETC system by depressing the accelerator pedal with the ignition in the on (run) position (engine off). What is the most likely result if the system is functioning correctly?

a; The throttle goes to wide open when the accelerator pedal is depressed all the way.

b; there is no throttle movement

c; the throttle will open partially but not all of the way

d; the throttle will perform a self test by closing and then opening to the default position

Back 68

b; there is no throttle movement

Front 69

With the ignition off and the key out of the ignition, what should happen if a technician uses a screwdriver and pushes gently on the throttle plate in an attempt to open the valve?

a; Nothing. The throttle should be kept from moving by the motor, which is not energized with the key off.

b; The throttle plate should move and stay where it is moved and not go back unless pushed back.

c; the throttle should move and then spring back to the home position when released

d; the throttle should move closed but not open further than the default position

Back 69

c; the throttle should move and then spring back to the home position when released

Front 70

the throttle body may be cleaned (if recommended by the vehicle manufacturer) if what conditions are occurring?

a; coast down stall

b; rough idle

c; lower than normal idle speed

d; any of the above

Back 70

d; any of the above