Question 1

What are four components that are supplied voltage by the automatic shutdown (ASD) relay points in some vehicle systems?

Accepted Answer

The ASD relay points supply voltage to the fuel pump, positive primary coil terminal, oxygen sensor heater, and fuel injectors.

Question 2

What is the purpose of the inertia switch in the fuel pump circuit?

Accepted Answer

The inertia switch opens the fuel pump circuit and stops the fuel pump if the vehicle is involved in a collision.

Question 3

How does the PCM task manager monitor and correct fuel delivery?

Accepted Answer

The PCM task manager will look at the present state of the fuel delivery system and compare these readings to the desired range determined by the fuel delivery strategy. If a fuel delivery requires a minor correction, the PCM will increase or decrease STFT.

Question 4

A vacuum leak may cause the engine idle speed to be lower than specified.

Accepted Answer

A) True 
 B)False

Question 5

What is the scavenging process?

Accepted Answer

Scavenging is the process of pushing exh

Question 6

An idle speed control motor is sometimes referred to as a throttle kicker.

Accepted Answer

A) True 
 B)False

Question 7

Electronic fuel injection systems, replacing older carburetor systems, have evolved to meet increasingly strict emissions regulations.

Accepted Answer

A) True 
 B)False

Question 8

How does the fuel system monitor treat one-trip and two-trip faults detected in the fuel delivery system?

Accepted Answer

The fuel trim monitor will store freeze

Question 9

Low supply voltage at the fuel pump may result in low fuel pump volume.

Accepted Answer

A) True 
 B)False

Question 10

What effect could a plugged fuel system return line have on the fuel delivery system?

Accepted Answer

Higher fue

Question 11

Why relieve the fuel pressure before disconnecting a fuel system component?

Accepted Answer

Fuel pressure must b

Question 12

How does the PCM control the air/fuel ratio on fuel-injected engines?

Accepted Answer

The computer control

Question 13

Detergent added to gasoline helps to prevent deposits from building up on injector tips.

Accepted Answer

A) True 
 B)False

Question 14

Increasing injector pulse width has what effect on the air/fuel ratio?

Accepted Answer

The air/fu

Question 15

Low fuel pressure may be caused by a worn fuel pump or restricted fuel filter.

Accepted Answer

A) True 
 B)False

Question 16

Intake manifolds made of glass fiber-reinforced nylon resin are lighter than older cast iron or aluminum manifolds, which improves fuel economy.

Accepted Answer

A) True 
 B)False

Question 17

A vehicle is brought in for a complaint of a rotten egg (sulphur) smell coming from the exhaust. The most likely cause(s) is/are:

Accepted Answer

A)  insufficient fuel discharge 
B)  rich air/fuel ratio 
C)  both A and B 
D)  neither A nor B 
A)  insufficient fuel discharge 
B)  rich air/fuel ratio 
C)  both A and B 
D)  neither A nor B

Question 18

The PCM makes what assumption regarding the availability of fuel at the injectors?

Accepted Answer

The PCM assumes that

Question 19

On a return-style fuel injection system, what could cause high fuel pressure, and what would the results be?

Accepted Answer

High fuel pump pressure may be

Question 20

What do OBD II regulations require regarding a fuel system monitor?

Accepted Answer

OBD II regulations require tha

What are four components that are supplied voltage by the automatic shutdown (ASD) relay points in some vehicle systems?

What is the purpose of the inertia switch in the fuel pump circuit?

How does the PCM task manager monitor and correct fuel delivery?

A vacuum leak may cause the engine idle speed to be lower than specified.

What is the scavenging process?

An idle speed control motor is sometimes referred to as a throttle kicker.

Electronic fuel injection systems, replacing older carburetor systems, have evolved to meet increasingly strict emissions regulations.

How does the fuel system monitor treat one-trip and two-trip faults detected in the fuel delivery system?

Low supply voltage at the fuel pump may result in low fuel pump volume.

What effect could a plugged fuel system return line have on the fuel delivery system?

Why relieve the fuel pressure before disconnecting a fuel system component?

How does the PCM control the air/fuel ratio on fuel-injected engines?

Detergent added to gasoline helps to prevent deposits from building up on injector tips.

Increasing injector pulse width has what effect on the air/fuel ratio?

Low fuel pressure may be caused by a worn fuel pump or restricted fuel filter.

Intake manifolds made of glass fiber-reinforced nylon resin are lighter than older cast iron or aluminum manifolds, which improves fuel economy.

A vehicle is brought in for a complaint of a rotten egg (sulphur) smell coming from the exhaust. The most likely cause(s) is/are:

The PCM makes what assumption regarding the availability of fuel at the injectors?

On a return-style fuel injection system, what could cause high fuel pressure, and what would the results be?

What do OBD II regulations require regarding a fuel system monitor?

Emissions and Engine Performance Overview

Basic Theories

History of on Board Diagnostics Obd

On Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Ignition System and Related Input Sensors Output Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of on Board Diagnostic Continuous Monitors

Strategies of on Board Diagnostic Non Continuous Monitors

I M Failure Diagnosis and Five Gas Exhaust Analysis

Filters

Exam 7: Fuel System and Related Input Sensors Output Actuators Diagnosis

What are four components that are supplied voltage by the automatic shutdown (ASD) relay points in some vehicle systems?

What is the purpose of the inertia switch in the fuel pump circuit?

How does the PCM task manager monitor and correct fuel delivery?

A vacuum leak may cause the engine idle speed to be lower than specified.

What is the scavenging process?

An idle speed control motor is sometimes referred to as a throttle kicker.

Electronic fuel injection systems, replacing older carburetor systems, have evolved to meet increasingly strict emissions regulations.

How does the fuel system monitor treat one-trip and two-trip faults detected in the fuel delivery system?

Low supply voltage at the fuel pump may result in low fuel pump volume.

What effect could a plugged fuel system return line have on the fuel delivery system?

Why relieve the fuel pressure before disconnecting a fuel system component?

How does the PCM control the air/fuel ratio on fuel-injected engines?

Detergent added to gasoline helps to prevent deposits from building up on injector tips.

Increasing injector pulse width has what effect on the air/fuel ratio?

Low fuel pressure may be caused by a worn fuel pump or restricted fuel filter.

Intake manifolds made of glass fiber-reinforced nylon resin are lighter than older cast iron or aluminum manifolds, which improves fuel economy.

A vehicle is brought in for a complaint of a rotten egg (sulphur) smell coming from the exhaust. The most likely cause(s) is/are:

The PCM makes what assumption regarding the availability of fuel at the injectors?

On a return-style fuel injection system, what could cause high fuel pressure, and what would the results be?

What do OBD II regulations require regarding a fuel system monitor?

Emissions and Engine Performance Overview

Basic Theories

History of on Board Diagnostics Obd

On Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Ignition System and Related Input Sensors Output Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of on Board Diagnostic Continuous Monitors

Strategies of on Board Diagnostic Non Continuous Monitors

I M Failure Diagnosis and Five Gas Exhaust Analysis

Filters