Deck 70: Ignition System Diagnosis and Service

Question 1

Technician A says that primary windings should have higher resistance. Technician B says that secondary windings should have higher resistance. Which technician is correct?

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

Answer 1

Technician B only

Question 2

All of the following statements are correct EXCEPT ________.

A)Current ramping can be used to test for current limits and charging rise time of the ignition circuit
B)Testing an ignition coil for resistance will always indicate its condition
C)A digital storage oscilloscope is used to perform current ramping tests.
D)Resistance tests may not reflect the actual performance conditions of an ignition coil

Answer 2

Testing an ignition coil for resistance will always indicate its condition

Question 3

Technician A says a that a voltmeter can be used to monitor the output signal of an optical sensor. Technician B says that optical sensors should be tested with an oscilloscope because of the sensor's speed. Which technician is correct?

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

Answer 3

Technician B only

Question 4

Typical primary coil resistance specifications usually range from ________ ohms.

A)500-1500
B)100-450
C)0.5 to 3
D)6,000-30,000

Question 5

Typical secondary coil resistance specifications usually range from ________ ohms

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

Question 6

What term describes the order that the spark reaches the cylinders?

A)Initial sequence
B)Firing order
C)Base timing
D)Performance specification

Question 7

Camshaft variation as displayed on a scan tool on an engine with a distributor-mounted CMP sensor should be plus or minus (±) ________ degrees.

A)5
B)2
C)10
D)None of the above.

Question 8

The spark plug threads in the cylinder head should be cleaned using a(an) ________ before installing new plugs.

A)Old toothbrush
B)Wire brush
C)Tap
D)Thread chaser

Question 9

Two technicians are discussing a no-start condition. During cranking, a magnet held over the coil moves and the engine backfires at times. Technician A says that a bad pickup coil or CKP sensor is the most likely cause. Technician B says that an open coil primary is the most likely 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 10

Which sensor produces a digital signal?

A)Magnetic sensor
B)Pickup coil
C)Hall-Effect sensor
D)Both B and C

Question 11

Which of the following could cause oil fouled spark plugs?

A)Weak ignition system output
B)Short trips or excessive idling
C)Defective valve stem seals
D)Low engine temperature

Question 12

A coil is being checked, with the following results. What does the reading mean?

A)The coil is overloaded.
B)The coil secondary is open.
C)The coil primary is open.
D)Not enough information.

Question 13

Technician A says that indexing the distributor is the same as setting ignition timing. Technician B says that a distributor that is not phased correctly can cause a misfire and rough idle. Who is right?

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

Question 14

A no-start condition is being discussed on an engine equipped with a waste spark 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. Who is right?

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

Question 15

During cranking, most pickup coils should produce a minimum of ________.

A)0.50 volts AC
B)0.25 volts DC
C)0.50 volts DC
D)0.25 volts AC

Question 16

What testing device is shown in this illustration?

A)Ground tester
B)Spark tester
C)Spark meter
D)Gauss gauge

Question 17

A vehicle with an electronic ignition system (EI) has a loss of power with no engine misfiring. Technician A that says the base ignition timing may need to be adjusted. Technician B says that the exhaust system may be restricted. Who is right?

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

Question 18

A distributor ignition (DI) system has a Hall-Effect type pickup trigger. Technician A says that this type of pickup may be tested with an ohmmeter. Technician B says that this type of pickup produces an analog voltage signal. Who is right?

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