Answer 10 free questions

ASE Advanced & EV: 10 free questions

Tap an answer to see if you're right and why, or switch to Timed and get scored at the end. Each answer is also under its question.

1. ASE L1 Advanced Engine Performance

   During a cranking relative-compression test using a current probe on the battery/starter cable, a weak (low-compression) cylinder is identified by:

   AA higher current pulse for that cylinder BAn increase in cranking speed (RPM) CA lower current pulse for that cylinder DA longer crank time affecting all cylinders equally
   Show answer

   Answer: C. A lower current pulse for that cylinder

   A cylinder with good compression resists the piston's upward travel, so the starter must draw more current on that stroke. A weak cylinder offers less resistance, producing a noticeably lower current hump.

2. ASE L3 Light-Duty Hybrid / EV

   In a series hybrid electric vehicle, the internal combustion engine:

   AIs mechanically coupled to the drive wheels through the transmission BDrives only a generator and never directly powers the drive wheels CProvides all propulsion torque during highway cruising DIs used solely to operate the air conditioning compressor
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   Answer: B. Drives only a generator and never directly powers the drive wheels

   In a series hybrid the engine turns a generator that supplies electricity to the traction motor and/or battery; only the electric motor drives the wheels, so the engine has no mechanical path to the road.

3. ASE L4 ADAS (Driver Assistance)

   Automotive long-range radar used for adaptive cruise control most commonly operates in which frequency band?

   A2.4 GHz B24 GHz C76-77 GHz D300 MHz
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   Answer: C. 76-77 GHz

   Long-range ADAS radar operates in the 76-77 GHz band (short/mid-range historically used 24 GHz). The higher frequency gives the narrow beam and resolution needed to track vehicles at long distance.

4. ASE XEV High-Voltage EV Safety

   High-voltage cables and conduit in an xEV are identified by what color per common industry convention?

   AOrange BYellow CBlue DRed
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   Answer: A. Orange

   Orange is the accepted identifier for high-voltage (>60 V DC) cabling so technicians can immediately recognize energized conductors.

5. ASE L1 Advanced Engine Performance

   Two technicians discuss crank/cam sensors. Technician A says a magnetic (variable-reluctance) crankshaft sensor produces an AC voltage whose amplitude rises with RPM. Technician B says a Hall-effect sensor produces a digital square-wave signal whose amplitude stays constant regardless of RPM. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
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   Answer: C. Both Technicians A and B

   A variable-reluctance sensor's induced AC voltage increases with tooth speed, while a Hall-effect sensor switches a fixed-amplitude digital signal independent of speed. Both are correct.

6. ASE L3 Light-Duty Hybrid / EV

   Two technicians discuss the Toyota power-split (series-parallel) system. Technician A says the planetary gearset lets the engine drive the wheels and turn MG1 (generator) at the same time. Technician B says MG2 provides traction torque and also acts as a generator during regenerative braking.

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: C. Both Technicians A and B

   The planetary power-split device splits engine power between the wheels and MG1, while MG2 both drives the wheels and recovers energy as a generator during regen; both statements are correct.

7. ASE L4 ADAS (Driver Assistance)

   Two technicians discuss ADAS calibration types. Technician A says static calibration uses fixed targets with the vehicle stationary. Technician B says dynamic calibration requires driving the vehicle at a specified speed. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: C. Both Technicians A and B

   Static calibration uses stationary targets; dynamic calibration uses a road drive at OEM speed and conditions. Both statements are correct, and some vehicles require both.

8. ASE XEV High-Voltage EV Safety

   Two technicians discuss the HVIL. Technician A says the HVIL is a low-voltage loop routed through HV connectors and covers. Technician B says breaking the HVIL causes the BMS to open the main contactors. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: C. Both Technicians A and B

   Both are correct: the HVIL is a low-voltage series loop, and interrupting it signals the BMS to open the contactors and de-energize the HV bus.

9. ASE L1 Advanced Engine Performance

   A secondary ignition waveform shows one cylinder with a firing line far higher than the others and a shortened spark line. The MOST likely cause is:

   AA carbon-fouled spark plug shunting the secondary to ground through its deposits BAn open or high-resistance secondary path (worn plug, wide gap, or bad wire) on that cylinder CA rich mixture in that cylinder making the spark gap easier to ionize DA head gasket leaking between adjacent cylinders, bleeding off compression pressure
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   Answer: B. An open or high-resistance secondary path (worn plug, wide gap, or bad wire) on that cylinder

   Excess firing voltage plus a short spark line means the spark is struggling against high resistance or an open in the secondary, such as a worn or wide-gapped plug or a bad wire/boot. A fouled plug would instead show a low firing line.

10. ASE L3 Light-Duty Hybrid / EV

    All of the following can cause a loss-of-isolation (leakage) DTC EXCEPT:

    ACoolant leaking into the HV battery pack BA 12-volt auxiliary battery that is low on state of charge CA chafed high-voltage cable contacting the chassis DNon-specified PAG oil used in the HV electric A/C compressor
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    Answer: B. A 12-volt auxiliary battery that is low on state of charge

    Isolation faults are caused by a conductive path between an HV conductor and chassis ground. A low aux battery can set many other codes (network, no-READY), but it does not lower HV-to-chassis insulation resistance.