SOS MECHANIC CERTIFICATION FINAL EXAMS
ACTUAL QUESTIONS AND ANSWERS SURE A+
✔✔The EGR valve is faulty, exhaust gas leaking into the intake manifold when the
engines idling can - ✔✔cause rough idle and stalling
✔✔What does the term "injector pulse width" refer to - ✔✔the length of time an injector
is open
✔✔Which of the following could result in an infrared analyzer giving a higher than actual
HC reading - ✔✔failing to purge the sample hose before testing
✔✔A plugged catalytic converter will cause a vacuum to - ✔✔read a continuous gradual
loss of vacuum at 1000rpm
✔✔What would the mechanic be doing by jumping the a+b terminals in the diagnose
connector shown below - ✔✔accessing the system diagnostics mode
✔✔Which of the following could cause engine detonation - ✔✔both a and b
✔✔the computer must receive inputs from which of the following for proper idle speed
control motor operation - ✔✔engine coolant temperature
✔✔The on-board micro computer receives signals from - ✔✔sensors
✔✔All of the following correctly describe fuel evaporation control - ✔✔fuel vapors are
vented to the atmosphere
✔✔Obd 1 systems do not monitor the evaporator systems obd 2 - ✔✔fuel tank pressure
and canister vents
, ✔✔what types of meter should you use power train module - ✔✔a high impermanence
digital computer
✔✔The Carbon cainister is part of - ✔✔fuel vapor recovery
✔✔the power train control module pc, - ✔✔reads only memory
✔✔the OBD 2 vehicles the compression - ✔✔running continuously
✔✔ The engine vacuum is low but steady - ✔✔Retarded Timing
✔✔The Purpose of catalytic converter - ✔✔oxidize hc co into c02 and h20
✔✔What vehicles are designed to go into a closed loop operation when - ✔✔all of the
above
✔✔Diagram shows a vacuum hose connected to "p vacuum" this means the hose
should be connected - ✔✔above the throttle plate
✔✔If the voltage spike is not high enough on one cylinder, what is the most likely
source of the problem. - ✔✔a failed spark plug
✔✔wide-open-throttle the power train control module reverts - ✔✔open loop, rich
mixtures
✔✔during a cylinder leakage test air escaping through the throttle body means there is
a leak at - ✔✔the intake valve
✔✔higher than normal oxides of nitrogen (n0x) emissions may be caused by - ✔✔all of
the above
✔✔A reading of 8 volts on meter 2 while cranking would indicate - ✔✔an excessive
ground circuit voltage drop
✔✔emission control systems are installed on engines to reduce what 3 specific exhaust
products - ✔✔Hydrocarbons, carbon monoxide and oxides of nitrogen
✔✔You have verified a slow cranking complaint, which of the following should you do
next - ✔✔Determine the condition of the battery
✔✔The Egr System is designed to - ✔✔cruise
ACTUAL QUESTIONS AND ANSWERS SURE A+
✔✔The EGR valve is faulty, exhaust gas leaking into the intake manifold when the
engines idling can - ✔✔cause rough idle and stalling
✔✔What does the term "injector pulse width" refer to - ✔✔the length of time an injector
is open
✔✔Which of the following could result in an infrared analyzer giving a higher than actual
HC reading - ✔✔failing to purge the sample hose before testing
✔✔A plugged catalytic converter will cause a vacuum to - ✔✔read a continuous gradual
loss of vacuum at 1000rpm
✔✔What would the mechanic be doing by jumping the a+b terminals in the diagnose
connector shown below - ✔✔accessing the system diagnostics mode
✔✔Which of the following could cause engine detonation - ✔✔both a and b
✔✔the computer must receive inputs from which of the following for proper idle speed
control motor operation - ✔✔engine coolant temperature
✔✔The on-board micro computer receives signals from - ✔✔sensors
✔✔All of the following correctly describe fuel evaporation control - ✔✔fuel vapors are
vented to the atmosphere
✔✔Obd 1 systems do not monitor the evaporator systems obd 2 - ✔✔fuel tank pressure
and canister vents
, ✔✔what types of meter should you use power train module - ✔✔a high impermanence
digital computer
✔✔The Carbon cainister is part of - ✔✔fuel vapor recovery
✔✔the power train control module pc, - ✔✔reads only memory
✔✔the OBD 2 vehicles the compression - ✔✔running continuously
✔✔ The engine vacuum is low but steady - ✔✔Retarded Timing
✔✔The Purpose of catalytic converter - ✔✔oxidize hc co into c02 and h20
✔✔What vehicles are designed to go into a closed loop operation when - ✔✔all of the
above
✔✔Diagram shows a vacuum hose connected to "p vacuum" this means the hose
should be connected - ✔✔above the throttle plate
✔✔If the voltage spike is not high enough on one cylinder, what is the most likely
source of the problem. - ✔✔a failed spark plug
✔✔wide-open-throttle the power train control module reverts - ✔✔open loop, rich
mixtures
✔✔during a cylinder leakage test air escaping through the throttle body means there is
a leak at - ✔✔the intake valve
✔✔higher than normal oxides of nitrogen (n0x) emissions may be caused by - ✔✔all of
the above
✔✔A reading of 8 volts on meter 2 while cranking would indicate - ✔✔an excessive
ground circuit voltage drop
✔✔emission control systems are installed on engines to reduce what 3 specific exhaust
products - ✔✔Hydrocarbons, carbon monoxide and oxides of nitrogen
✔✔You have verified a slow cranking complaint, which of the following should you do
next - ✔✔Determine the condition of the battery
✔✔The Egr System is designed to - ✔✔cruise
