Deck 6: Ignition System and Related Input Sensorsoutput Actuators Diagnosis

Question 1

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

Answer 1

A

Question 2

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

Answer 2

D

Question 3

The spark burn time line is the length of time that the spark plug is igniting (firing) the air/fuel mixture in the cylinder.

Answer 3

True

Question 4

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

Question 5

The long-life platinum spark plugs are capable of lasting 50,000 miles (80,467 km).

Question 6

An engine knock may occur due to:

A) low fuel octane
B) excessive carbon buildup in the combustion chamber
C) ignition spark occurring too early
D) all of the above

Question 7

During testing with a secondary ignition system oscilloscope, a technician notices that all cylinders exhibit low coil kV output. Which of the following is the most likely cause?

A) faulty coil-to-plug insulation
B) high resistance in the primary control circuit
C) PCM has an open coil driver circuit
D) blown ignition fuse

Question 8

A misfire diagnostic trouble code (DTC) is stored for cylinder #4 (P0304) on a coil-on-plug EI system. Preliminary testing of components following manufacturer's recommended procedures are within acceptable ranges. Technician A says that water may have intruded into the recessed spark plug well in the cylinder head. Technician B says that the ignition extension tube should be inspected for carbon tracking. Who is correct?

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

Question 9

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

Question 10

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 11

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 12

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

Question 13

The ignition system on many newer cars has no:

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

Question 14

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

Question 15

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

Question 16

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

Question 17

The spark plugs are fired at:

A) various times on the power stroke
B) 12 degrees BTDC on the compression stroke
C) 12 degrees ATDC on the power stroke
D) various times on the compression stroke

Question 18

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

Question 19

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

Question 20

A secondary ignition oscilloscope pattern is being analyzed. The voltage spikes of cylinders #1, #2, and #3 are 9 to 12 kV while cylinder #4 is 35 kV. What is the most likely cause of this?

A) open plug wires for cylinders #1, #2, and #3
B) shorted spark plug
C) grounded plug wires
D) open plug wire for cylinder #4

Question 21

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 22

What happens when a metal blade is positioned in a Hall Effect switch?

Question 23

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

Question 24

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

Question 25

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

Question 26

If all cylinders are igniting the air/fuel mixture uniformly, what should the difference in firing line height (voltage) of each cylinder be?

Question 27

What is the typical spark plug burn time?

Question 28

What are the two design methods used on the coil-on-plug independent ignition system?

Question 29

What are the differences between the coil-on-plug ignition system and previous EI systems?

Question 30

What are the coil oscillations that occur after the spark burn time line on an oscilloscope?

Question 31

What is the spark plug heat range, and why is it important?

Question 32

Describe the iridium spark plug and its benefits.

Question 33

The independent ignition system is also known as what?

Question 34

What is an alternative replacement to the platinum spark plug installed by the vehicle manufacturer?

Question 35

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