General Diagnosis
A vehicle with double overhead valves is being diagnosed for backfiring through the intake manifold. Technician A says this engine uses a separate cam shaft for the intake and exhaust valves. Technician B says a V6 DOHC engine has two cam shafts. Who is correct? - A only - B only - Both A and B - Neither A nor B
A only
Technician A says a battery load test should be run no longer than 15 seconds. Technician B says during a battery load test, no more than 800 amps should be applied to the battery. Who is correct? - A only - B only - Both A and B - Neither A nor B
A only
Technician A says a high resistance connection at the alternator electrical connector could cause excessive heat buildup in the connector. Technician B says a connector that is too tight can cause heat distortion. Who is correct? - A only - B only - Both A and B - Neither A nor B
A only
Technician A says installing a rebuilt alternator in a vehicle with a weak battery without recharging the battery may cause premature alternator failure. Technician B says a battery open circuit voltage reading of 12.6 volts indicates the battery is good and fit for service. Who is correct? - A only - B only - Both A and B - Neither A nor B
A only
A 4-cylinder engine is making a loud metallic knocking that gets louder as the engine warms up or if the throttle is quickly snapped open. The noise almost disappears when the spark for cylinder number 3 is shorted to ground. Technician A says the symptoms indicate a cracked flywheel. Technician B says the symptoms indicate a loose connecting rod bearing. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
A vehicle is being diagnosed for an overheating complaint while at cruising speeds. Technician A says the electric cooling fan may be defective. Technician B says that the radiator may have some damaged cooling fins. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
A voltage drop test of the starter motor control circuit is being performed as shown in the figure. With the ignition disabled, the engine is cranked over with the voltmeter on the lowest scale. Technician A says that a reading below 2.5 volts is okay. Technician B says that if a reading above 1 volt is obtained, individual components in the circuit will need to be tested to find the problem. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
Technician A says valve adjustment should always be performed on a cold engine. Technician B says the piston should be placed at TDC of the compression stroke. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
Technician A says when testing a circuit, the voltage drop during cranking should not exceed 3.5 volts. Technician B says individual voltage drop tests on control circuit components may be necessary. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
The vacuum gauge shows a fluctuating motion from 15 to 21 in. Hg at idle. Technician A says this could be caused by a loose exhaust manifold. Technician B says this could be caused by a burned valve. Who is correct? - A only - B only - Both A and B - Neither A nor B
B only
A low-pitched roaring noise is being diagnosed. The noise disappears when the accessory drive belt is removed. Technician A says the belt tensioner pulley bearing should be checked for roughness. Technician B says the alternator bearing should be checked for roughness. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
During a cylinder power balance test, there is no rpm drop on cylinder 3. Technician A says that the cylinder is not contributing. Technician B says that the cylinder may have an inoperative spark plug. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
Refer to the scope patterns in the illustration. Technician A says the two patterns indicate current ramping. Technician B says the number 2 pattern on the right shows a shorted injector. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
Referring to the figure, Technician A says a deteriorated belt could cause squealing and chirping. Technician B says belt deflection should be under 1/2 inch (12.7 mm) per foot (30.5 cm) free span. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
Technician A says that if the measurement in the figure is set too wide, it will retard valve timing. Technician B says it will reduce valve overlap. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
Technician A says the current draw on a 4-cylinder engine is usually lower than that on an 8-cylinder engine. Technician B says current draw higher than allowable specifications could be due to high starter cable resistance. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
Technician A says the current draw test should be performed when the starter turns slowly. Technician B says during a starter current draw test, the ignition should be disabled. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
While performing engine noise diagnostics, Technician A says a stethoscope is a good tool for noise location. Technician B says you may have to duplicate the specific operating condition. Who is correct? - A only - B only - Both A and B - Neither A nor B
Both A and B
During cranking, Technician A says battery voltage should be no more than 5 volts. Technician B says cranking voltage does not matter, as long as the engine starts. Who is correct? - A only - B only - Both A and B - Neither A nor B
Neither A nor B
On an idling vehicle equipped with an AIR system, Technician A says the MIL will turn on after 2 minutes. Technician B says that the air helps cool the O2sensor. Who is correct? - A only - B only - Both A and B - Neither A nor B
Neither A nor B
When testing voltage drop while cranking the engine with the ignition disabled, Technician A says the voltage drop on the positive battery cable should be no more than 5 volts. Technician B says the voltage drop on the positive battery cable should be no more than 1 volt. Who is correct? - A only - B only - Both A and B - Neither A nor B
Neither A nor B
High current draw and low cranking speed usually indicate: - excessive resistance in the starter circuit - a defective battery - a defective starter - a defective ignition switch
a defective starter
All of the following are true of the cylinder leakage test EXCEPT: - air loss and bubbles in the radiator indicate a bad head gasket or engine casting crack - air loss from the oil filler cap indicates worn piston rings - a gauge reading of 100 percent indicates no cylinder leakage - air loss from the exhaust indicates a valve problem
a gauge reading of 100 percent indicates no cylinder leakage
All statements are true about adjusting valves EXCEPT: - mechanical lifters are adjusted by rotating the nut on the rocker arm until the specified clearance is achieved - after hydraulic lifters are pumped up, adjust by rotating the nut until the specified clearance is achieved - use a feeler gauge for mechanical lifters - the piston should be at top dead center
after hydraulic lifters are pumped up, adjust by rotating the nut until the specified clearance is achieved
A proper cooling system inspection involves all of the following EXCEPT: - pressure test - cooling fan inspection - evaporator core inspection - thermostat inspection
evaporator core inspection
All of the following are measured by a four-gas analyzer EXCEPT: - hydrocarbons (HC) - carbon monoxide (CO) - oxides of nitrogen (NOx) - oxygen (O2)
oxides of nitrogen (NOx)
All of the following are inputs for timing control EXCEPT: - knock sensor - engine speed (rpm) - power steering load - engine load
power steering load
All of the following apply to OBD-II guidelines EXCEPT: - use of a standard list of diagnostic trouble codes - standard communication protocol - ability to record and store fault conditions when they occur - turn on the MIL if emission levels exceed four times the standards for that model year vehicle
turn on the MIL if emission levels exceed four times the standards for that model year vehicle
The LEAST LIKELY cause of low cylinder compression is: - worn valves - worn rings - blown head gasket - worn valve guides
worn valve guides
When diagnosing fuel-injection system problems, a technical service bulletin search is performed for all of the following reasons EXCEPT: - to save diagnostic time to locate service manual - updates or specification changes - mid-year production changes - year, make, and model identification
year, make, and model identification
