Question 1

In-cylinder pressure transducer

Accepted Answer

Measures combustion pressure within the engine cylinder.

Question 2

Common rail fuel system

Accepted Answer

High-pressure fuel system that supplies fuel to the injectors.

Question 3

Piezoelectric injector

Accepted Answer

Fuel injector that uses piezoelectric crystals to control fuel delivery.

Question 4

EGR valve

Accepted Answer

Exhaust gas recirculation valve that redirects exhaust gases back into the intake manifold.

Question 5

DOC

Accepted Answer

Diesel oxidation catalyst that helps reduce emissions by converting pollutants into less harmful compounds.

Question 6

DPF

Accepted Answer

Diesel particulate filter that traps and removes soot particles from the exhaust gas.

Question 7

SCR system

Accepted Answer

Selective catalytic reduction system that reduces nitrogen oxide emissions by injecting urea into the exhaust stream.

Question 8

NOx sensor

Accepted Answer

Measures the concentration of nitrogen oxide in the exhaust gas.

Question 9

Turbocharger

Accepted Answer

Device that increases engine power by compressing the intake air.

Question 10

Boost pressure sensor

Accepted Answer

Measures the pressure of the intake air entering the engine.

Question 11

Fuel pressure regulator

Accepted Answer

Controls the pressure of the fuel supplied to the injectors.

Question 12

Fuel rail pressure sensor

Accepted Answer

Monitors the pressure of the fuel in the fuel rail.

Question 13

Fuel temperature sensor

Accepted Answer

Measures the temperature of the fuel in the fuel system.

Question 14

Intake air temperature sensor

Accepted Answer

Measures the temperature of the intake air.

Question 15

Manifold absolute pressure sensor

Accepted Answer

Measures the pressure in the intake manifold.

Question 16

Exhaust gas temperature sensor

Accepted Answer

Monitors the temperature of the exhaust gas.

Question 17

Glow plug control module

Accepted Answer

Controls the operation of the glow plugs during cold starts.

Question 18

Camshaft position sensor

Accepted Answer

Detects the position of the camshaft to determine fuel injection timing.

Question 19

Crankshaft position sensor

Accepted Answer

Detects the position of the crankshaft for engine timing.

Question 20

ECM

Accepted Answer

Engine control module that manages various engine functions and systems.

Question 21

CAN bus

Accepted Answer

Controller Area Network bus that allows communication between different modules in the vehicle.

Question 22

Diagnostic trouble codes (DTCs)

Accepted Answer

Codes stored in the ECM that indicate a fault in the system.

Question 23

Data link connector (DLC)

Accepted Answer

Port used to connect a scan tool for diagnostics.

Question 24

Actuator

Accepted Answer

Device that converts electrical signals into mechanical action, such as an injector or EGR valve.

Question 25

Circuit integrity

Accepted Answer

Ensuring that all electrical connections and wiring are intact and functioning properly.

Question 26

Injector balance rate

Accepted Answer

Measures the difference in fuel delivery between individual injectors.

Question 27

Cylinder contribution test

Accepted Answer

Determines the contribution of each cylinder to engine performance.

Question 28

Compression test

Accepted Answer

Checks the integrity of the engine's cylinders and piston rings.

Question 29

Air-fuel ratio

Accepted Answer

The ratio of air to fuel in the combustion chamber.

Question 30

Air intake restriction

Accepted Answer

Measures the restriction in the air intake system.

Question 31

IAT

Accepted Answer

Intake air temperature sensor that measures the temperature of the intake air.

Question 32

MAF sensor

Accepted Answer

Mass airflow sensor that measures the amount of air entering the engine.

Question 33

Throttle position sensor

Accepted Answer

Monitors the position of the throttle valve.

Question 34

MAP sensor

Accepted Answer

Manifold absolute pressure sensor that measures the pressure in the intake manifold.

Question 35

Fuel delivery pressure

Accepted Answer

Measures the pressure of the fuel delivered to the injectors.

Question 36

Fuel supply pump

Accepted Answer

Supplies fuel from the fuel tank to the high-pressure fuel system.

Question 37

Fuel injector balance

Accepted Answer

Checks the balance of fuel delivery between different injectors.

Question 38

Fuel return flow

Accepted Answer

Measures the amount of fuel returning to the fuel tank.

Question 39

Ignition timing

Accepted Answer

The timing at which the spark plugs fire in the engine.

Question 40

Ignition system

Accepted Answer

System that provides the spark to ignite the fuel-air mixture in the cylinders.

Question 41

Accelerator pedal position sensor

Accepted Answer

Monitors the position of the accelerator pedal

Question 42

APPS

Accepted Answer

Accelerator pedal position sensor that measures the position of the accelerator pedal.

Question 43

ICP sensor

Accepted Answer

Injection control pressure sensor that monitors the high-pressure oil system.

Question 44

IPR valve

Accepted Answer

Injection pressure regulator valve that controls the high-pressure oil flow to the injectors.

Question 45

IATN

Accepted Answer

International Automotive Technicians Network, an online community for automotive professionals.

Question 46

Scan tool

Accepted Answer

Diagnostic tool used to communicate with the vehicle's ECM and retrieve diagnostic information.

Question 47

Powertrain control module (PCM)

Accepted Answer

Controls the powertrain system, including the engine and transmission.

Question 48

VGT

Accepted Answer

Variable geometry turbocharger that adjusts the turbine geometry to optimize engine performance.

Question 49

EBP sensor

Accepted Answer

Exhaust back pressure sensor that measures the pressure in the exhaust system.

Question 50

Engine speed sensor

Accepted Answer

Detects the rotational speed of the engine crankshaft.

Question 51

Fuel system priming

Accepted Answer

Process of removing air from the fuel system and ensuring proper fuel delivery.

Question 52

Fuel system bleeding

Accepted Answer

Process of removing air from the fuel system after component replacement or maintenance.

Question 53

Fuel system contamination

Accepted Answer

Presence of contaminants or water in the fuel system that can affect engine performance.

Question 54

Fuel system leak testing

Accepted Answer

Process of identifying and repairing fuel leaks in the system.

Question 55

Air system restriction

Accepted Answer

Measures the restriction in the engine's intake air system.

Question 56

Vacuum gauge

Accepted Answer

Instrument used to measure the intake manifold vacuum.

Question 57

Cylinder head

Accepted Answer

The top part of the engine that contains the combustion chambers and valves.

Question 58

Piston ring

Accepted Answer

Seals the combustion chamber and helps maintain compression in the cylinder.

Question 59

Fuel pressure gauge

Accepted Answer

Instrument used to measure the pressure in the fuel system.

Question 60

Injector pulse width

Accepted Answer

Duration of time that the fuel injector is open during a fuel injection event.

Question 61

Battery voltage test

Accepted Answer

Measures the voltage output of the vehicle's battery.

Question 62

Electrical load testing

Accepted Answer

Evaluates the electrical system's ability to handle various loads.

Question 63

Starter motor

Accepted Answer

Electric motor that cranks the engine to start the combustion process.

Question 64

Glow plug relay

Accepted Answer

Controls the operation of the glow plugs in a diesel engine during cold starts.

ASE L2 Electronic Diesel Engine Diagnosis Flashcards