Deck 6: Ignition System and Related Input Sensors Output Actuators Diagnosis

Question 1

Ignition dwell time is the length of time the primary circuit is turned on prior to each cylinder firing.

Answer 1

True

Question 2

Compared to electronic ignition systems with distributors, EI systems without distributors provide:

A) more stable control of ignition timing and spark advance
B) reduced emissions
C) improved fuel economy
D) all of the above

Answer 2

D

Question 3

The primary current must flow long enough to:

A) allow all cylinders to return to firing position
B) allow the magnetic field to build up in the coil
C) permit the secondary system to reach readiness
D) reach maximum required voltage

Answer 3

B

Question 4

The independent ignition system offers greater reliability and a lower incidence of cylinder misfires compared to past ignition systems.

Question 5

A random misfire code P0300 is usually associated with an ignition system failure.

Question 6

The coil-on-plug design allows for increased coil saturation time between cylinder firing.

Question 7

The long-life platinum spark plugs have a designated service life of 50,000 miles (80,467 km).

Question 8

The coil-on-plug ignition system is sometimes referred to as a coil-over-plug ignition system.

Question 9

The ignition system on many newer cars has no:

A) distributor
B) coil
C) spark plugs
D) crank position sensor

Question 10

As the rpm of an engine is increased, the ignition spark occurs:

A) earlier
B) later
C) at the same time
D) none of the above

Question 11

Changes in engine load also affect when the ignition spark should be delivered.

Question 12

The normal required secondary coil voltage is 10,000 volts. With different system designs, a coil's maximum secondary voltage can exceed 80,000 volts. The difference between and required secondary coil voltage and the maximum secondary coil voltage is referred to as:

A) bonus secondary voltage
B) stored secondary voltage
C) secondary voltage spread
D) secondary reserve voltage

Question 13

The vehicle manufacturer specification for spark plug heat range can be changed.

Question 14

A higher than normal firing line voltage could be caused by a low secondary ignition resistance.

Question 15

Technician A says a Hall Effect switch voltage signal goes from 12 V to 0 V when the rotating metal blade enters the switch. Technician B says a Hall Effect switch produces an analog voltage signal. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 16

Technician A says the spark plugs are in the secondary ignition circuit. Technician B says the ignition module is part of the secondary ignition circuit. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 17

When an ignition system misfires or spark plugs fire at the wrong time, which of the following will be adversely affected?

A) engine performance
B) fuel economy
C) emissions levels
D) all of the above

Question 18

Misfires are more likely to occur under lower engine speeds and decreased load conditions.

Question 19

Technician A says that the Hall Effect sensor produces a digital square wave voltage signal. Technician B says that the Hall Effect sensor contains a permanent magnet on the outside of the rotating blades. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 20

A technician repaired a cold-start and hard-starting problem by replacing the secondary ignition wires and spark plugs. After the repair, the vehicle failed an emission test for high CO and HC levels. Technician A says a restriction in the fuel delivery system such as the fuel filter could be the problem. Technician B says that the engine oil could be contaminated with fuel. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 21

Describe the benefits of the iridium spark plug compared to those of the platinum spark plug.

Question 22

What is spark plug reach, and why can't spark plugs of different reaches be used interchangeably?

Question 23

During the power stroke, when must the air/fuel charge be fully ignited in order for maximum combustion pressure and power production to occur?

Question 24

What is the term for the period of time when current flows through the primary windings of a coil to increase the magnetic field generated?

Question 25

What is the number of volts supplied to the coil primary winding?

Question 26

What is the average spark plug current flow time in an EI system?

Question 27

The sensors that are an integral part of the ignition system are also an integral element in what monitor for OBD II systems?

Question 28

What is spark plug heat range, and how do the heat ranges of hot plugs and cold plugs differ?

Question 29

Electronic ignition (EI) systems produce an average current flow across the spark plug electrodes of 1.5 milliseconds compared to about 1 millisecond in an older-type distributor ignition (DI) system. Why is this extra 0.5 millisecond of current flow in an EI system important?

Question 30

What happens when the edge of a rotating blade moves into a Hall Effect switch and what happens when the edge of the rotating blade exits the Hall Effect switch?

Question 31

What is the designated service life of an iridium spark plug?

Question 32

What generic OBD II DTCs will be set if a misfire condition is detected?

Question 33

In a coil-on-plug system, each spark plug has its own ignition coil. What are the two different ways the ignition modules are placed in a coil-on-plug system?

Question 34

What are the advantages of the coil-on-plug and coil-near-plug systems compared to earlier ignition system designs?

Question 35

In a waste spark system, what happens with the cylinders while a pair of spark plugs is firing?