ASE A8 EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2025-2026
spark plug wire resistance should be - Answers 5000 to 10000 ohms
how do you test spark plug cables insulation - Answers spray it with salt water
The specification, such as 10 BTDC, indicates that - Answers indicates that the spark occurs at
10 degrees before top dead center of the compression stroke
With an increase in speed, ignition must begin - Answers earlier to end by 23 degrees ATDC
Each cylinder must produce power once every - Answers 720 degrees
what is the differance between tbi pfi and gdi - Answers throttle body injection
port fuel injection
gas direct injection
ideal air to fuel ratio is - Answers 14.7:1
EGR valve, air pump, and evaporative emissions canister are controlled by the - Answers pcm
what is open loop mode? - Answers when the engine is too cold to burn all fuel the engine
doesn't respond to sensor feedback
Fail-Safe or Limp-In Mode - Answers ether usses other signals to compensate for out of range
sensors or limits the rpm to 1200
tps adaptive strategy does what - Answers if something like the tps drops from its normal range
it will adjust for wear by adding voltage.
Air induction system - Answers An engine system that directs outside air into the engine's intake
manifold
Closed loop - Answers An electronic feedback system in which the sensors provide constant
information on what is taking place in the engine
Drive cycle - Answers The operating conditions that must exist before OBD II self-diagnosis can
take place. It includes an engine start and operation that brings the vehicle into closed loop and
includes whatever specific operating conditions are necessary, either to initiate and complete a
specific monitoring sequence or to verify a symptom or repair.
Enable criteria - Answers The operating conditions that must be met to run some OBD II
monitors.
obd2 Freeze frame - Answers With this feature of OBD II systems, the PCM takes a snapshot of
the activity of various inputs and outputs at the time the PCM illuminated the MIL
,Parameter identification (PID) - Answers A scan tool display for OBD II systems that shows
current emission-related data values of inputs and outputs, calculated values, and system
status information.
Trip - Answers An OBD II drive cycle that includes all of the conditions
basic diagnostic checks 4 - Answers 1battery voltage and charging system operation
2check for open fuses
3vissually inspect componants of system
4check for aftermarket parts
what does a scan tool use a PID for - Answers obd2 standardized system like the coolant temp
sensor
when connecting the scan tool what two things should have been done? - Answers get engine at
operating temp set key to off
KOEO self test - Answers key on engine off
KOER self test - Answers Key on engine running
obd2 mode 6 data - Answers allows to monitor data on any scan tool. can check for missfires.
oxogen sensors ect
visual inspections after finding a dtc - Answers check vacuum lines
check belts
check battery and connections
inspect wiring for sensors and outputs
check coolant and condition of it
check air filter and inlet
check for exhaust leaks
if no dtc are present - Answers see if data is within normal ranges
pcm power and ground are in good condition
identify all vehical mods
tire inflation
, Hard Start/Long Crank
symptom with no dtcs - Answers componants/system
Starting System
Fuel/Ignition/Computer
Intake Air System
MAF Sensor
Exhaust System
PCV System
EVAP System
possible causes
Weak battery, poor battery connections, defective starter
Low fuel pressure or volume, weak spark, incorrect spark timing, TP, ETC, MAF/MAP sensor
faults
Restriction in intake air system, plugged air filter, induction air leak
Dirty, misreading or defective MAF sensor
Restricted exhaust system
Damaged or disconnected PCV hose
Fuel vapor purge during cranking
No Crank
symptom with no dtcs - Answers componant/system
Anti-Theft Devices
Base Engine
Starting system
possible cause
spark plug wire resistance should be - Answers 5000 to 10000 ohms
how do you test spark plug cables insulation - Answers spray it with salt water
The specification, such as 10 BTDC, indicates that - Answers indicates that the spark occurs at
10 degrees before top dead center of the compression stroke
With an increase in speed, ignition must begin - Answers earlier to end by 23 degrees ATDC
Each cylinder must produce power once every - Answers 720 degrees
what is the differance between tbi pfi and gdi - Answers throttle body injection
port fuel injection
gas direct injection
ideal air to fuel ratio is - Answers 14.7:1
EGR valve, air pump, and evaporative emissions canister are controlled by the - Answers pcm
what is open loop mode? - Answers when the engine is too cold to burn all fuel the engine
doesn't respond to sensor feedback
Fail-Safe or Limp-In Mode - Answers ether usses other signals to compensate for out of range
sensors or limits the rpm to 1200
tps adaptive strategy does what - Answers if something like the tps drops from its normal range
it will adjust for wear by adding voltage.
Air induction system - Answers An engine system that directs outside air into the engine's intake
manifold
Closed loop - Answers An electronic feedback system in which the sensors provide constant
information on what is taking place in the engine
Drive cycle - Answers The operating conditions that must exist before OBD II self-diagnosis can
take place. It includes an engine start and operation that brings the vehicle into closed loop and
includes whatever specific operating conditions are necessary, either to initiate and complete a
specific monitoring sequence or to verify a symptom or repair.
Enable criteria - Answers The operating conditions that must be met to run some OBD II
monitors.
obd2 Freeze frame - Answers With this feature of OBD II systems, the PCM takes a snapshot of
the activity of various inputs and outputs at the time the PCM illuminated the MIL
,Parameter identification (PID) - Answers A scan tool display for OBD II systems that shows
current emission-related data values of inputs and outputs, calculated values, and system
status information.
Trip - Answers An OBD II drive cycle that includes all of the conditions
basic diagnostic checks 4 - Answers 1battery voltage and charging system operation
2check for open fuses
3vissually inspect componants of system
4check for aftermarket parts
what does a scan tool use a PID for - Answers obd2 standardized system like the coolant temp
sensor
when connecting the scan tool what two things should have been done? - Answers get engine at
operating temp set key to off
KOEO self test - Answers key on engine off
KOER self test - Answers Key on engine running
obd2 mode 6 data - Answers allows to monitor data on any scan tool. can check for missfires.
oxogen sensors ect
visual inspections after finding a dtc - Answers check vacuum lines
check belts
check battery and connections
inspect wiring for sensors and outputs
check coolant and condition of it
check air filter and inlet
check for exhaust leaks
if no dtc are present - Answers see if data is within normal ranges
pcm power and ground are in good condition
identify all vehical mods
tire inflation
, Hard Start/Long Crank
symptom with no dtcs - Answers componants/system
Starting System
Fuel/Ignition/Computer
Intake Air System
MAF Sensor
Exhaust System
PCV System
EVAP System
possible causes
Weak battery, poor battery connections, defective starter
Low fuel pressure or volume, weak spark, incorrect spark timing, TP, ETC, MAF/MAP sensor
faults
Restriction in intake air system, plugged air filter, induction air leak
Dirty, misreading or defective MAF sensor
Restricted exhaust system
Damaged or disconnected PCV hose
Fuel vapor purge during cranking
No Crank
symptom with no dtcs - Answers componant/system
Anti-Theft Devices
Base Engine
Starting system
possible cause
