Deck 14: Ignition System Operation and Diagnosis

Question 1

The device that signals the switching of the coil on and off or just on in most instances is called the ________.

A) PCM
B) ignition switch
C) trigger
D) module

Answer 1

C

Question 2

A spark tester should be used to check for spark because ________.

A) a spark tester requires at least 25,000 volts to fire
B) it can detect the gap of the spark plugs
C) it is connected to the CKP sensor to check its output
D) it can detect a cracked spark plug

Answer 2

A

Question 3

Spark plugs have a ________ in the center electrode to reduce electromagnetic noise.

A) calibrated gap
B) coil
C) resistor
D) capacitor

Answer 3

C

Question 4

On a vehicle with a distributor, what is used to trigger the ignition control module (ICM) or the PCM?

A) PCM
B) Pick-up coil
C) Ignition control module
D) Ignition coil

Question 5

A coil is being tested using current ramping. The waveform should ________.

A) slope downward
B) remain flat
C) slope upward
D) start off flat and then slope upward

Question 6

An ignition scope pattern of the ignition secondary shows the firing line at 28 kV. This indicates ________.

A) high resistance in the secondary ignition circuit
B) a too wide spark plug gap
C) a normal voltage reading
D) Either B or C

Question 7

What action will be taken if the knock sensor detects spark knock?

A) PCM will lean out the fuel mixture
B) PCM will reduce EGR flow
C) The sensor will rotate until the knock stops
D) PCM will retard ignition timing

Question 8

Technician A says that inductive ignition systems supply battery voltage to the positive side of the ignition coil and pulse the negative side of the coil on and off to ground to create a high-voltage spark. Technician B says if an ignition system uses a distributor, it is called a DI system. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 9

Technician A says that a pickup coil can be tested with an ohmmeter. Technician B says that ignition coils can be tested with an ohmmeter. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 10

Technician A says that a thorough visual inspection should be performed on all ignition components when diagnosing an engine performance problem. Technician B says platinum spark plugs can be regapped after use in an engine. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 11

Technician A says that a defective spark plug wire can cause an engine miss. Technician B says that a defective spark plug can cause an engine miss. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 12

Which of these components sends a pulse signal to an electronic ignition module?

A) Ignition coil
B) Coil wire
C) CKP sensor
D) Resistor

Question 13

Typical secondary coil resistance specifications usually range from ________ ohms.

A) 1-3
B) 100-450
C) 6,000-30,000
D) 500-1500

Question 14

Technician A says that the primary coil has more windings. Technician B says that the secondary coil has more windings. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 15

Technician A says that an engine will likely miss under load if the ignition coil is tracked. Technician B says that one wire of a waste spark coil must be grounded. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 16

Technician A says to use a normal spark plug when checking for spark. Technician B says that a spark tester should be used to check for spark. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 17

A DTC (Diagnostic Trouble Code) P0301 (misfire on cylinder 1) on a waste spark system could be caused by all of these, EXCEPT ________.

A) open spark plug wire on cylinder 4 (companion to cylinder 1)
B) defective crankshaft sensor
C) open plug wire on cylinder 1
D) defective #1 spark plug

Question 18

A no-start condition is being described on an engine equipped with a coil-on-plug ignition system. Technician A says that a bad CKP (crankshaft position) sensor could be the cause. Technician B says that an open spark plug wire could be the cause. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 19

Identify the type of ignition system shown in this diagram.

A) Waste spark ignition system
B) Coil-on-plug ignition system
C) Distributor ignition system
D) Capacitor discharge system

Question 20

Identify the type of ignition system shown in this diagram.

A) Distributor ignition system
B) Capacitor discharge system
C) Coil-on-plug ignition system
D) Waste spark ignition system