Deck 12: Engine Electronics

Question 1

Which powertrain and emissions data bus is used on most post-2010 automotive chassis?

A) OBD II
B) UART
C) LINs
D) CAN-C

Answer 1

D

Question 2

What two types of temperature sensors are used in diesel particulate filters?

A) Zirconium dioxide and platinum.
B) Constantin and iron sensors.
C) Oxygen sensors and particulate sensors.
D) Pyrometers and resistance thermometers.

Answer 2

D

Question 3

What do SAE J-standards dictate on chassis data buses?

A) Which engines are compatible with which PCMs.
B) Exhaust emission levels.
C) Hardware and software rules for multiplexing data exchange between modules.
D) Only electrical hardware standards for PCM systems.

Answer 3

C

Question 4

Hall-effect throttle position sensors offer what advantage over potentiometer sensors?

A) Better accuracy.
B) Faster response to accelerator input.
C) Better reliability and increased service life.
D) Have less moving parts.

Question 5

How are modules/controllers identified on a data bus?

A) With pre-programmed electronic id tags.
B) With a unique bus address.
C) By the connectors bus address.
D) Using dip switches set by the service technician.

Question 6

Vehicle PCM programming can be divided into what two categories?

A) Chassis data and emissions data.
B) Standard data and performance data.
C) Customer data and proprietary data.
D) Single wire data and two wire data.

Question 7

What are the three types of mass air flow sensors (MAF)?

A) Hall-effect, thermocouple and critical flow.
B) Intake, exhaust and naturally aspirated.
C) Hot wire, critical flow venturi and vortex flow.
D) Electromechanical, resistive and piezo-resistive.

Question 8

What are the three distinct stages of engine electronics information processing?

A) Sensor input, data storage and driver output.
B) Data gathering, data storage and data output.
C) Sensor telemetry, bus multiplexing and output switching.
D) Data input, data processing and output.

Question 9

Where are the key program instructions logged during vehicle operation?

A) Non-volatile memory (NV-RAM).
B) Read only memory (ROM).
C) Erasable programmable read only memory (EEPROM).
D) Random access memory (RAM).

Question 10

What type of sensors commonly use a reference voltage (V-Ref) supplied by the PCM?

A) Smart switches.
B) All sensors use V-Ref.
C) Temperature, pressure and Hall-effect position sensors.
D) Airflow, position and temperature sensors.

Question 11

What advantages do smart switches provide over electromechanical switches?

A) Faster response.
B) Significantly reduce the amount of wiring required.
C) Significantly reduce the number of switches required.
D) They do not require a power source.

Question 12

The term handshake is used to verify what condition?

A) Two way communications between the target module and an EST.
B) Compatibility of different data bus standards.
C) Error conditions put out by the CPU.
D) That a module is maintaining a proper V-Ref level.

Question 13

Piezo-resistive pressure sensors offer what advantage over variable-capacitance sensors?

A) Less costly to manufacture.
B) Operate under higher temperatures.
C) Measure higher pressures.
D) Increased accuracy.

Question 14

Which two pins are assigned for CAN-C bus access on a J1962 connector?

A) pins 2 and 10.
B) pins 5 and 16.
C) pins 3 and 11.
D) pins 6 and 14.

Question 15

Which of the following best describes the electronic engine control inputs on current engines?

A) Data and sensor input.
B) Sensor telemetry, data bus messages, and switch status inputs.
C) Engine, chassis and emissions inputs.
D) Digital and analog.

Question 16

What is the generally favored term used to describe a light duty, electronic engine controller?

A) Powertrain control module (PCM).
B) State of health (SOH). controller
C) Central processing unit (CPU).
D) The data module.

Question 17

Why are transistors used as output drivers on the PCM?

A) It improves data bus speeds.
B) To allow low voltage logic commands to switch higher voltage drivers such as those for fuel injectors.
C) To switch the low voltage engine bus to the higher voltage chassis bus.
D) For heat dissipation from the PCM.

Question 18

Connecting to a chassis data bus is done through what connector on most current vehicles?

A) UART serial connector.
B) J1962 data-link connector.
C) Class II OBD connectors.
D) Data bus USB connectors.

Question 19

Which of the following is NOT a function of the PCM?

A) Broadcast two-way mobile vehicle communications (telematics).
B) Retain data in memory.
C) Output command signals using drivers.
D) Filter and prepare input signals.

Question 20

What are three bus architectures used in vehicle communication buses?

A) Star, loop and hybrid.
B) Networked, peer to peer and wireless.
C) Wired, wireless and fiber optic.
D) One wire, two wire and three wire.

Question 21

Technician A states the CPU is responsible for retaining processing cycle result data. Technician B states the PCM processing cycle is performed by the CPU. Who is correct?

A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.

Question 22

Technician A states that Hall effect sensors can be used for shaft positional and speed reporting. Technician B states Hall effect sensors can be used for temperature signaling. Who is correct?

A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.