Download Electrical Troubleshooting and Diagnostics and more Exams Nursing in PDF only on Docsity!
ASE A6 PRO Electrical/Electronic Systems Exam
Questions and Correct Answers 2025.
When troubleshooting a slow drain on the battery, which if these diagnostic
tools should be used?
A. Ohmmeter
(B.
Ammeter C.
VoltmeterD. Test fight - Correct
Answer-
The fault shown in the above circuit is:
(pg. 81)
A. an
open
(B. a short to
groundC. too much
capacitanceD. too much resistance - Correct
Answer-B.
An air bag system is being serviced, Technician A says to disconnect the
yellow SRS connectors at the front of the vehicle. Technician B says to disconnect and
isolatenegative the battery
cable.
Who is right?
A. Technician A
only (B. Technician B
onlyC. Both A and
BD. Neither A or B - Correct
Answer-.B
Which of these should be used when soldering electrician wiring
connections?
(A. rosin core
flux
B. acid core
fluxC. sulfur core
fluxD. none of the above - Correct Answer-.a
When testing computer-controlled systems, a digital multimeter should be
used with an input impedance of at least:
A. lOk ohms
B. lOOk
ohmsC. 1
megohm(D. 10 megohms - Correct
Answer-.d
The condition of a lead-acid battery is being checked. Technician A says
to use a galvanometer. Technician B says to use a capacitive battery
tester.
WhoA. Technician is right? A
only(B. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-
While testing a starting circuit on a 5.7L V8 engine, the technician finds that
the engine
cranks slowly.
Thestarter current draw is 90 amps, and the battery voltage while cranking is 11
volts.should What the technician do next?
(A. Check for voltage drop of the starter motor
circuit.
B. Test the battery
capacity.C. Replace the starter motor, as a short Is
indicated.D. Determine the condition of the engine. - Correct Answer-
Technician A says that a noisy alternator could be caused by a bad diode.
Technician B says that a noisy alternator could be caused by a worn bearing.
Who is right?
A. Technician A
only B. Technician B
only(C. Both A and
BD. Neither A or B - Correct Answer-
The analog ohmmeter needle does not move when connected as shown
above. (pg 82) This indicates that the rotor winding is:
A. shorted
B.
groundedC.
complete (D. open - Correct Answer-
A vehicle's tum signals flash too slowly. Technician A claims that the
condition could be caused by a faulty flasher. Technician B says that a bulb
may be the wrong type.
Who is right?
A. Technician A
onlyB. Technician B
only(C. Both A and
BD. Neither A or B - Correct
Answer-
The oil pressure light on a vehlole dashboard stays on whenever the engine
is running.
The oil pressure has been checked with a mechanical gauge and it
isspecifications. within Technician A says that the circuit between the indicator
lightpressure and switchthe could be grounded. Technician B says that an open in the
pressureswitch Itself could be the
cause.
Who Is right?
(A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-
Nothing happens when the ignition key Is turned to the START posltion In a
vehicle with
a good
battery.Teohnician A says that If a clicking sound is heard when a jumper wire is
'connectedbetween the battery and the solenoid 'S' terminal, a problem exists in the
startercircuit. controlTechnician B says that if a jumper wire is connected between the
batterysoienold and 'S' terminal andthe there Is no
sound,starter theIs
defective.
Who is right?
A. Technician A
onlyB. Technician B
only C. Both A and
B
D. Neither A or B - Correct Answer-D. If a jumper wire is connected between
theand batterythe solenoid 'S' terminal and the engine cranks, there is a problem in
thecontrol starter circuit. If the solenoid makes a clicking sound, it Is
operatingproperly and the problem may be with the starter. If no sound is heard, the
solenoiddefective and should is be
replaced.
A vehicle continues to trip the windshield wiper circuit breaker. Technician
Acause says couldthe be a short circuit Technician B says that the cause could be
bindinglinkag wiper
e.
Who is
right?
A. Technician A
onlyB. Teohnician B
only C. Both A and
BD. Neither A or B - Correct Answer-C. A circuit breaker will disconnect the
circuit if the circuit has higher than normal current flow, which can be caused by a short
inor a the binding circuit of the wiper
linkage.
Technician A says that a battery with an open circuit voltage of 12.
voltscharged. Is fully Technician B says that if the Indlcator on a sealed maintenance-free
battery Is yellow, the battery shouid be
charged.
Who is
right?
A. Technician A
onlyB. Technician B
only C. Both A and
B
D. Neither A or B - Correct Answer-D. A battery with a 12.1 volt
readingundercharged. is Technician B is wrong because if the indicator is yellow on
amaintenance-free sealed battery, it means that the fluid level is below the
levelhydrometer. of the The battery should not be charged and should be replaced.
When performing a current draw test using an ammeter, a reading
greater than that which was specified would indicate:
A. excessive circuit resistance
B. a decrease in olrcult
resistanceC. an open
circuitD. a decrease in circuit voltage - Correct Answer-B. When performing a
currenttest using draw an ammeter, a decrease in
circuitresistance will cause a reading greater than what was specified.
Technician A says that using a 20,000 ohm/volt analog meter ts a good
choice for ECM
clroult testing. Technician B says that oarefui use of a test light can
determinecondition of the a Throttle Position
(TP)sensor.
Who is
right?
A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-D. An analog meter with a low input
resistance should only be usedfor non-computer type circuits; a test light should never
bediagnose used to sensor
circuitry.
Technician A says that an in-vehicle high-rate discharge battery load test
shouidbe performed always if a 12-volt battery if its condition is in questlon. Technician B
says that the battery should be discharged (loaded) at twice its ampere
hour rating.
Who Is right?
A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-D. The high-rate discharge (load) test of a
battery.frowned Is upon by OEMs because of the likely hood of over stressing the
alternator.done with theIf battery removed (or disconnected) from the vehicle, the
loadshould applied be three times the battery's ampere-hour rating or half of its
CCA rating.
All of the following are indications of an under-charged battery condition
EXCEPT:
All of the following warning system lights use a grounding switch
EXCEPT:
A. oil
pressure B. coolant
temperatureC. brake
warningD. charging system - Correct Answer-D. Charging system warning lights are
controlledby charging voltage. The
lightbulb is not grounded at the instrument panel. Instead, current flows
throughand eventually the bulb grounds at the ground brush inside the alternator.
Whenalternator the is charging, current flows through a wire to the opposite side of
thethe bulbignition from switch. Because both sides of the bulb receive similar voltages,
noflows current through the bulb and it doesn't
light.
Technician A says that all power should be removed from a circuit before
testingcircuit with the
anammeter. Technician B says that ail power should be removed from a
circuittesting before the circuit
withan
ohmmeter.
Who is
right?A. Technician A
onlyB. Technician B
only C. Both A and
B
D. Neither A or B - Correct Answer-B. When using an ohmmeter, all power
shouldremoved be from the circuit
totested. be Power to the circuit is necessary when testing a circuit with an
ammeter.
Technician A says that checked with an ohmmeter, a diode should
have a high resistance in one direction only. Technician B says a diode permits the flow of
electricityin both
directions.
Who is
right?A. Technician A
only B. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-A. A diode is a semiconductor that
permitsof electricity the flow in only one direction. When checking a diode with an
ohmmeter,put the probes with red on the N-side; black goes on the P-side. Read the
resistance, then reverse the leads. The diode should have a high resistance in one
direction only.
All of the following could cause an inoperative starter
EXCEPT:
A. an improperly adjusted neutral safety
switch B. worn or missing flywheel ring gear
teethC. an open circuit between the solenoid and the
ignition switch
D. an open in the solenoid ground circuit - Correct Answer-B. Worn or missing
fly-wheel
ring gear teeth may not enable the starter to crank the engine, hut would
notstarter cause the itself to be inoperative. All of the other choices could prevent the
starteroperatin from
g.
A power seat system is extremely noisy when operated. All of the following
couldcaus be the
eEXCEPT a:
A. faulty
motor
B. faulty
transmissionC. bad
groundD. lack of lubricant - Correct Answer-C. While a bad ground would disable the
system or make the power seat operate slowly, it would not be the cause of noisy
operation.
All of these are true statements regarding air bag supplemental restraint
systems (SRS) EXCEPT:
A. While removed from the vehicle, the airbag module should be stored with
the cover
pad facing
up.B, Safety glasses should be worn when servicing the air bag
system.C. Only rosin core solder and heat shrink tubing should be used to repair air
bagwirin system
gD.. Performing tests Improperly or using the wrong equipment can result In
accidental air bag deployment. - Correct Answer-C. Air bag system wiring harnesses
shouldrepaired and not be only replaced. All of the other answers are true statements
regardingbag air
systems.
All of these are used when applying Ohm's Law
EXCEPT:
A. amperes
(i)
B. watts
(W)C. ohms
CR)D. voltage CE) - Correct Answer-B. The components of Ohm's Law include
voltage (E), amperes (I) and ohms
(R). t
Technician A says that the rectifier bridge consisting of six diodes changes
DCvoltage. to AC Technician B says that an externally grounded alternator can be
full-fieldedgrounding theby field
terminal.
Who is
right?
A. Technician A
onlyB. Technician B
only C. Both A and
B
D. Neither A or B - Correct Answer-B. The rectifier bridge changes AC
voltagevoltage. to To test DC an externally grounded alternator, make sure all lights and
accessories
D. there is a short in the motor. - Correct Answer-C. A fuse normally blows
becausehigh current of draw. A typical cause for a blown fuse is a short circuit. A short
may occur in the wiring or motor itself. If a window is binding in its track, the motor will
tend to draw an excessive amount of current. This high current draw may cause the circuit
breaker to trip or a fuse to blow. The problem may also cause motor damage. An open
circuitdraw zero will current and therefore, would not be a cause for the
blown fuse.
A horn makes a very weak sound. Technician A says a faulty power
connectionbe the could
cause.Technician B says a faulty fuse could be the
cause.
Who is
right?A. Technician A
only B. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-A. If horn sound is a weak tone, current
isand poor too low, electrical connections may be the culprit, If a fuse is blown, the
hornsound will at not
all.
Two lights are connected in parallel. An additional light is added, also wired
inTechnician parallel. A says the total resistance will decrease. Technician B says the
totalwill voltage
drop.
Who is
right? A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-A. Adding an additional path through
whichcurrent the can flow has decreased the total resistance of the circuit. Each
light drops 12 volts
An ohmmeter is being used to check a circuit for continuity. Technician
Ainfinity says anor full
scalereading on an ohmmeter indicates no continuity. Technician B says a zero
reading on an ohmmeter indicates
continuity.
Who is
right?A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-C. An infinity reading indicates an open
wire;or low a readingzero indicates a good
connection.
Neither of the low beam headlights on a vehicle will light but the high
beams work normally. Technician A says the headlight thermal breaker could be
faulty..Techniciansays the dimmer switchB may be
faulty.
Who is
right?A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-B. The headlight switch and breaker
wouldaffect thealso high beams. The dimmer switch would affect both low beam
headlights.
The front and rear turn signals on the left side of a vehicle are non-
functional.Technician A says the turn signal flasher could be shorted to ground.
Technicianthe hazard B saysflasher could be shorted to
ground.
Who is
right?A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-D. The flasher or fuses would affect both
rightleft sides. and The most likely cause is two bad bulbs, a defective turn signal
switchproblem or in a the wiring that is common to the front and rear on the left side of
the vehicle.
A circuit is wired in series. Technician A says the total of all voltage drops will
equalbattery the voltage. Technician B says the current flow through each part of the
circuitsame Is the
Who is
right?
A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-C. Current remains constant throughout
a circuit, and the total of all voltage drops always equals the source voltage provided.
A circuit is wired in parallel. Technician A says that total circuit current is
divided across each load. Technician B says the voltage is the same at each
load.
Who is right?
A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-C. Current will be divided across the
loads and the voltage is the same at each
load.
Technician A says that if the washer pump ground circuit (as shown above,
pgfaulty, 87) theis wiper motor will not run. Technician B says that the wiper motor
shown will continue to run after the switch is opened until the park switch
also opens.
Who is
right?
on. Technician B says that the resistance of a component should be
checkedvoltage is applied while
tothe
circuit.
Who is
right?
A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-D. Technician A is wrong because digital
ohmmetersdo not need to be zeroed before use. Test lead continuity should be checked
however,by touching the two ohmmeter leads together and watching for a zero
readingmeter. Technician on the B is wrong because an ohmmeter is used to check the
resistancea component of or wire while there is no voltage
applied to the circuit. Current flow from an outside voltage source,such as the vehicle
battery,damage canthe ohmmeter, so the circuit or component should be isolated from
theelectrical vehicle system before any testing is done.
Which of the parts schematically shown above (pg 88) is sometimes used in
a headlight switch?
A. fixed type
B. variable rheostat
typeC. variable potentiometer
typeD. thermistor - Correct Answer-B. A rheostat is a type of variable resistor
that has two terminals. One terminal is connected to the fixed end of the resistor and
the otherconnected is to a movable contact called a wiper. The resistance Is varied by
movingposition theof the wiper on the resistor, thereby increasing or decreasing
thecurrent. electrical In a headlight switch, the knob is connected to the wiper and as
theturned, knob the is instrument panel lights dim or brighten. The other type of
variable resistor, the potentiometer, is a three-terminal resistor. Potentiometers are
communalelectronic engineused in control system sensors, such as the Throttle Position (TP)
sensor.
The Interior lights in a vehicle stay on all the time. Technician A says that a
door switch
could be
stuck. Technician B says there could be a short to ground in the circuit before
oneswitches. of the
Who is
right?
A. Technician A
only B. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-B. A door switch is a grounding
switchcompletes that the courtesy light circuit when a door is opened. When the
doorthe switch is closed, opens and the interior lights go out. It is more likely that a door
switch would stick in the open position, so Technician A is wrong.
Technician B is
right because a short to ground in the circuit before the door switch would
complete the circuit, making the lights stay on regardless of switch position.
A customer complains of static on the radio. Technician A says that loose
or missing ground wires could be the cause. Technician B says that a defective
antennacould be cablethe
cause.
Who is
right?A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-C. Poor sound quality, static and poor
receptionbe caused can by a defective antenna, an antenna that is not grounded or
connected properly or one
that isnot trimmed properly. Static can also be caused by faulty ignition
components, loosemissing ground wires or and defective noise suppression devices.
A start/clutch interlock switch is being tested. Technician A says that, with
the clutch
pedal in
thereleased position, the switch should have continuity when checked with an
ohmmeter.Technician B
saysthat, with the pedal depressed, there should be voltage on both sides of
thewhen switch checked with a
voltmeter.
Who is right?
A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-B. The start/clutch interlock switch is open
when the dutch pedal is in the released position, interrupting current flow in the
starterTechnician circuit. A is wrong because an open switch should have no continuity.
Whenclutch thepedal is depressed, the switch closes, allowing current flow in the
circuit.
The backup lights in the circuit shown above right do not work. (pg 88) Which
of these is the MOST LIKELY cause?
A. a corroded connector C
B. a break in the black wire between connector C400 and
spliceC. both S404 backup light bulbs are
burned out D. the backup light switch is faulty - Correct Answer-D. Answers A and B
arebecause wrong either problem would only
affectlight and one the question states that both lights do not work. Answer C is
possiblenot probable but itthat both is bulbs burned out at the same
time.switch A would faulty affect both backup lights and is the most likely cause for
failure of the choices
given.
In the test shown above (pg 89), the voltmeter reads 0.3volts. Technician
Aindicates says this there is excessive resistance in the starter power circuit.
Technician B says this indicates there is excessive resistance in the starter
ground circuit.
Who is
right?A. Technician A
onlyB. Technician B
only C. Both A and
BD. Neither A or B - Correct Answer-D. Technician A is wrong because 0.3 volts
isspecification within for voltage drop in a starter power circuit. Technician B is
wrongthe starter because ground circuit is not being tested in the
illustration.
A communications failure in the CAN system will set what type
of OTC?
A. B -
BodyB. C -
ChassisC. P -
PowertrainD. U - Network - Correct Answer-D. The onboard diagnostic system will
setbeginning a code with the
letter U.
The brake light on the right side of a vehicle is dim compared with the one
ontechnician the left. testsA the circuit with a voltmeter. With the brake pedal applied,
thenegative lead connected to voltmeter
the negative battery terminal and the positive lead connected to the light
socket,voltmeter the reading is 6.2volts. What does the voltmeter reading
indicate?
A. an open ground
circuitB. high resistance in the ground
circuit C. low resistance in the ground
circuitD. a bad light bulb - Correct Answer-B. If there were an open ground circuit
orwas the bad, bulb the light would not work at all. Since the bulb is
working, butoptimally, the not technician is voltage drop testing. If the circuit was operating
properly,voltmeter the reading would be 0.0 volts and no higher than 0.
volts. This would mean that all the system voltage was being used by the light. The
readingvolts means of 6.2 that there is excessive resistance in the circuit,
robbingof the necessary the light voltage needed for optimal illumination. The
techniciancontinue checking should the ground path until the voltmeter reading returns to
normalrepair the and problem
connection.
The sunroof on a vehicle works intermittently. Technician A says there could
bewiring a poor connection. Technician B says the panel could be binding in
the rails.
Who is
right? A. Technician A
onlyB. Technician B
only
C. Both A and
B
D. Neither A or B - Correct Answer-C. Loose or corroded connections could
causeintermittent problem. an The glass binding in the rails could cause the
electricoverheat motor and trip to the circuit breaker. After the breaker cools and resets, the
panel may work again until the binding again trips the breaker.
The charging system on a vehicle undercharges. Technician A says the cause
could be a loose alternator drive belt. Technician B says the cause could be
a defective ECM.
Who is right?
A. Technician A
onlyB. Technician B
onlyC. Both A and
B
D. Neither A or B - Correct Answer-C. A loose alternator drive belt could
causecharging reduced system output voltage, but on some vehicles, so could a defective
ECM.PCM/ECM The regulates alternator output voltage on many newer vehicles, The
PCM/ECMeither supplies power or ground to the alternator field, depending on the
system.power or ground The is pulse-width modulated in response to the amount
ofvoltage. sensing
The next question refer to the interval windshield wiper/washer wiring
schematic shown above. (pg 90)
The wipers do not work in the interval position. Which of the following
should the technician do first?
A. Measure resistance at terminals Rl and R2.
B. Replace the interval
governor.C. Check the
fuse. D. Check for an open circuit at S303. - Correct Answer-A. If the fuse were
bad,wipers the would not work at all, and the question
statesthat they only don't work in the interval position. An open at S
wouldwasher affect pump the but not the wipers. The interval governor should not be
condemned untilthe resistance is checked at terminals RI and R2 of the wiper switch. If the
resistance doesn't vary when the interval adjustment is turned, the wiper switch
shouldreplaced. be If the interval adjustment varies the resiscance, the interval
governorbe replaced. should
The next question refer to the interval windshield wiper/washer wiring
schematic shown above. (pg 90)
The wipers only work on high speed. All of the following could be the cause
EXCEPT:
A. a defective wiper
switchB. a loose connection at
G1002C. a defective interval
governor
All of the gauges on a vehicle work except the coolant temperature gauge.
Aresistor variable is connected between the sending unit wire and ground. With the
IgnitionON the resistanceswitch is
varied, making the gauge needle move. Technician A says the instrument voltage
regulatorcould be the
cause.Technician B says the sending unit could be
faulty.
Who is right?
A. Technician A
onlyB. Technician B
onlyC. Both A and
BD. Neither A or B - Correct Answer-B. If all the gauges were dead, then the
cause would probably be the instrument voltage regulator. However, only the
temperatureinoperative. Thegauge gauge is was tested properly in the question so a faulty
sendingindicated. unit is
Theresistance of the sending unit can be checked by connecting an ohmmeter
betweenterminal leadthe and ground. The resistance value should change in
proportioncoolant temperature. to the Compare results with the manufacturer's
specifications.
All of these types of headlights are found on today's vehicle's
EXCEPT for:
A. conventional sealed beams
headlamps.B. composite sealed beams
headlamps. C. Xenon
headlamps.D. LED headlamps. - Correct Answer-A. Conventional sealed beams have all
butreplaced been by the other types of headlamps listed in this question
Which of these is most useful for first diagnosing vehicles with multiplex
(networked) electrical systems?
A. A voltmeter
B. An
oscilloscopeC. A logic
probe D. A scan tool - Correct Answer-D. Multiplexed networks can be monitored
andusing tested an OEM or equivalent scan tool.
Which of these is best to use for testing networked components for proper
operation when a vehicle is not actually being driven on the road?
A. A jumper wire
B. A bi-directional scan
toolC. A digital volt-ohm
meterD. A backprobe device - Correct Answer-B. A bi-directional scan tool can
be used to command on-board actuators to perform their duty when the vehicle is
eitherservice, in orfor when it can be safely done while the vehicle is on
the road.
What is the best course of action to be taken if a heated seat grid is found
to be faulty?
A. Send the seat to the dealer for needed electrical
repairs. B. Take the seat apart and repair the defective
heaterC. Replace grid. the complete seat assembly with a
newD. Send one. the seat to an automotive upholstery shop for repair. - Correct
Answer-D.best course The of action, unless a qualified upholstery technician is on staff, is
toseat send out the for repair at an automotive upholstery shop. The special tools
neededlabor time and involved the would otherwise be
prohibitive.
What is meant by the term
MUX?
A. Multiphase
switchB. Multiplexed
networkC. Micro-unitized
assemblyD. Magnetic unit-injector - Correct Answer-B. MUX stands for "multiplex",
whichbasis of is operationthe for the type of communication system used in
networkvehicle equipped
s.
100000 or move decimal 6 places to right - Correct Answer-mega or "M"
standsman for how
y
1000 or move decimal 3 places to the right - Correct Answer-kilo or (k)
stands for how man
y
.001 or move decimal three spaces to the left - Correct Answer-milli (m)
standsman for how
y
.000001 or move decimal 6 spaces to the left - Correct Answer-micro (u)
standsman for how
y
voltage amps and resistance - Correct Answer-ohms law E I R stand
for what
divide volts by resistance - Correct Answer-ohms law to determine
amps....
multiply amps and ohms - Correct Answer-ohms law to
determine volts....
divide volts by amps - Correct Answer-ohms law to determine
resistance......
thermistor - Correct Answer-what type of sensor does a temperature
gauge use?
disconnect component from circuit and put leads in parallel - Correct
Answer-toohm test
s
