ASE Ignition Systems 2

Question 1

What typically causes carbon tracking on a spark plug boot or ignition coil tower?

Accepted Answer

Compromised insulation allowing voltage to arc along the surface to ground

Answer

Excessive fuel pressure forcing deposits upward

Answer

High humidity causing moisture on the coil surface

Answer

Low engine oil causing heat damage

Question 2

What is the primary function of the ignition control module (ICM)?

Accepted Answer

Switch primary coil current on and off to induce secondary high voltage

Answer

Regulate alternator charging voltage

Answer

Control fuel injector timing and duration

Answer

Regulate idle speed via the IAC motor

Question 3

Which spark plug electrode material offers the longest service life in modern vehicles?

Accepted Answer

Platinum or iridium

Answer

Copper core

Answer

Nickel alloy

Answer

Zinc alloy

Question 4

Abnormally high secondary ignition circuit resistance most commonly indicates what condition?

Accepted Answer

Worn spark plug electrodes, a wide plug gap, or damaged spark plug wires

Answer

Retarded ignition timing

Answer

Low battery voltage during cranking

Answer

A faulty crankshaft position sensor

Question 5

In a distributor-less ignition (DIS) system, what does the camshaft position sensor determine?

Accepted Answer

Which cylinder is on its compression stroke to fire the correct coil

Answer

Fuel injector pulse width for sequential injection

Answer

Engine coolant temperature for timing correction

Answer

Throttle opening rate for spark advance

Question 6

Engine knock (detonation) is most often caused by which ignition-related condition?

Accepted Answer

Excessively advanced ignition timing

Answer

Over-retarded ignition timing

Answer

A weak ignition coil producing low voltage

Answer

Incorrect spark plug wire routing

Question 7

What is the typical recommended replacement interval for iridium spark plugs?

Accepted Answer

60,000–100,000 miles

Answer

15,000–30,000 miles

Answer

30,000–45,000 miles

Answer

150,000–200,000 miles