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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A8 Computerized controls: practice questions

Our ASE A1–A8 bank has 13 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A8 Engine Performance

How does a wide-band air-fuel ratio sensor differ from a conventional oxygen sensor?

  1. It only reports rich or lean, but it switches faster than a conventional sensor
  2. It has no heater
  3. It measures exhaust temperature
  4. It measures the actual air-fuel ratio over a wide range
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D. It measures the actual air-fuel ratio over a wide range — Its output is often shown as a current or lambda value.

Question 2 · A8 Engine Performance

Why do oxygen sensors have heaters?

  1. To warm the exhaust
  2. To reach operating temperature quickly for closed-loop control
  3. To burn off carbon and oil deposits from the sensor tip at every start
  4. To measure temperature
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B. To reach operating temperature quickly for closed-loop control — Heater circuit faults set their own codes.

Question 3 · A8 Engine Performance

Why might a PCM need reprogramming as a repair?

  1. To erase the VIN
  2. The maker released updated software to fix a driveability or emissions issue
  3. To disable the MIL permanently on vehicles that have passed the emissions inspection
  4. To change the vehicle color
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B. The maker released updated software to fix a driveability or emissions issue — Check TSBs for calibration updates.

Question 4 · A8 Engine Performance

A throttle position sensor signal drops out at one point during a slow sweep. What does this show?

  1. A worn spot in the sensor
  2. A normal sensor
  3. A bad ground on the PCM
  4. A low 5-volt reference voltage from the PCM
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A. A worn spot in the sensor — A graphing meter or scope shows the glitch clearly.

Question 5 · A8 Engine Performance

What is the purpose of the MIL (check engine light)?

  1. To warn of low tire pressure
  2. To indicate an oil change or scheduled service interval
  3. To show low oil level
  4. To alert the driver to an emission-related fault
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D. To alert the driver to an emission-related fault — A flashing MIL means a severe misfire.

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