Gauges and Warning Systems

Question 1

Identify three (3) analog gauge designs

Answer 1

a) balancing coil
b) air core
c) stepper motor

Question 2

An air-core gauge operates by:

a) the interaction between opposing magnetic fields
b) applying a specific amount of voltage to a bimetal strip
c) a rotating magnetic field in stationary windings
d) applying heat to a bimetal strip

Answer 2

c) a rotating magnetic field in stationary windings

Question 3

Identify four (4) problem areas that may turn the brake warning light on.

Answer 3

a) park brake application
b) hydraulic brake system failure
c) low brake fluid level
d) ABS system application

Question 4

The rotor of a stepper motor gauge is composed of a(an):

a) coil of wire wrapped around a plastic core
b) permanent magnet
c) electromagnet
d) bimetal strip

Answer 4

b) permanent magnet

Question 5

A balancing coil gauge operates on the principle of:

a) heat
b) voltage
c) magnetism
d) mechanical drive

Answer 5

c) magnetism

Question 6

Warning lights generally have a built in test circuit that is active when the ignition key is in the run or start position, this may be referred to as:

a) sensor input test
b) I/M 240 test
c) inductive reactance
d) bulb check or prove out

Answer 6

d) bulb check or prove out

Question 7

Which electronic display requires a powerful light in order to be visible?

a) vacuum tube fluorescent display
b) liquid crystal display (LCD)
c) light emitting diodes (LEDs)
d) gas vapour ampoules

Answer 7

b) liquid crystal display (LCD)

Question 8

When performing a diagnosis of a customer concern for a gauge problem, the first step in the process is to:

a) remove the instrument cluster to find the concern
b) verify the customer concern
c) check for DTC’s, then command operation of the gauge with the scan tool
d) replace the IC with a new one because the majority are non-serviceable

Answer 8

b) verify customer concern

Question 9

When the ignition switch is first turned on (engine off) the oil pressure warning light does not turn on. A possible cause for this problem would be:

a) this is normal for the oil warning light
b) the dash cluster ground is broken
c) the fuse for the engine is burned out
d) the bulb is burned out

Answer 9

d) the bulb is burned out

Question 10

Identify two (2) applications for the use of LED indicators

Answer 10

a) backlighting to illuminated warning icons

b) to indicate whether a circuit is turned on

Question 11

The switch controlling the seatbelt warning light and audible chime is usually located in the:

a) passenger’s seat
b) driver’s and passenger’s seat
c) driver’s seat
d) driver’s seat belt buckle

Answer 11

d) driver’s seat belt buckle