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These 10 free ASE-A1-A8 questions are organized by exam domain, so you can see how each part of the ASE Automotive Certification Tests (A-Series, A1-A8) blueprint is tested. Reveal the answer and explanation under each question.
A warmed engine has a steady misfire on cylinder 4. Swapping the ignition coil and injector with other cylinders does not move the misfire. Cranking compression is 122 psi on cylinder 4 and 181-186 psi on the others. A wet test raises cylinder 4 to 126 psi. During a leak-down test at TDC on the compression stroke, air is heard clearly at the tailpipe. What is the root cause of the misfire?
Correct answer: C - A leaking exhaust valve in cylinder 4
An automatic-transmission vehicle stalls as it rolls to a stop after highway driving, then restarts normally in Park. During the event, scan data shows TCC command OFF, but converter slip remains near 0 rpm until the engine stalls. What failure is occurring during coastdown?
Correct answer: B - The torque-converter clutch is mechanically or hydraulically stuck applied
An on-demand AWD vehicle binds in tight turns after one tire was replaced. Three tires have rolling circumferences of 82.9, 83.0, and 83.1 inches; the replacement measures 84.2 inches. The manufacturer allows no more than 0.5 inch difference. No actuator or network DTCs are stored. What should be corrected before condemning the AWD hardware?
Correct answer: D - Correct the tire mismatch, then perform the specified checks or calibration
After tire pull is ruled out, a vehicle still drifts left on a level road. Camber and toe are within specification. Caster measures +2.0° left and +3.6° right; the specified range is +3.0° to +4.0°. The left side is adjustable. How should the alignment be corrected?
Correct answer: A - Increase left caster into the specified range
An on-vehicle brake lathe setup shows a front rotor at 26.40 mm. The discard thickness is 25.80 mm. Correcting the measured runout will remove 0.35 mm from each friction face. How should the rotor be serviced?
Correct answer: D - Replace the rotor; its projected thickness will be 25.70 mm
A brake pedal feels firm at first but slowly sinks under steady foot pressure. No external leakage is found, the fluid level remains stable, and the flexible hoses do not expand. With approved plugs installed directly in both master-cylinder outlet ports, the pedal still sinks. What has the plugged-port test isolated?
Correct answer: D - Internal bypass leakage inside the master cylinder
A vehicle cranks slowly. Battery open-circuit voltage is 12.7 V, cranking voltage stays at 10.2 V, and starter current is 115 A against a 170-220 A specification. Positive-side voltage drop is 0.18 V, while ground-side voltage drop is 2.4 V. Where is the excessive resistance?
Correct answer: A - The battery-to-engine ground path
With a high-speed CAN network powered down and isolated as specified, resistance across CAN-H and CAN-L at the diagnostic connector is 121 ohms. The network normally uses two 120-ohm terminating resistors. Technician A says both terminators are connected normally. Technician B says one terminator or its circuit path is missing. Who is correct?
Correct answer: B - Technician B only
An R-134a system has been charged to the specified mass. At 85°F ambient, both low- and high-side pressures are above specification at idle and vent temperature is warm. Directing a shop fan across the condenser quickly lowers high-side pressure and cools the outlet air. The condenser-fan command is present, but the fan does not turn. Which system should be tested before changing refrigerant charge?
Correct answer: C - The condenser-fan power and ground circuit
At normal operating temperature, combined short- and long-term fuel trim is +24% on both banks at idle and +4% at 2,500 rpm with no load. Fuel pressure under load and MAF data are within specification, and no exhaust leak is present ahead of either upstream oxygen sensor. Which diagnosis fits this load-dependent trim pattern?
Correct answer: A - A common unmetered-air leak downstream of the MAF sensor
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