A test engineer needs to verify that a software module correctly parses a CAN signal and outputs a diagnostic trouble code (DTC) when the signal exceeds a threshold. The module's output does not influence the CAN signal. Which testing approach is most suitable, and what is a key benefit?

Closed-loop testing, because it is required for all diagnostic-related software.

Closed-loop testing, because it provides higher fidelity to the real vehicle.

Open-loop testing, because it allows deterministic and repeatable verification of the module's logic.

Open-loop testing, but it cannot verify the DTC is set correctly because there is no feedback.

Which of the following is an example of a closed-loop testing application?

Testing a software function that calculates fuel consumption from a fixed input.

Testing a brake-by-wire system's response to a simulated slippery road surface.

Testing a diagnostic routine that reads a fixed fault code from memory.

Testing a display unit's response to a predefined sequence of button presses.

A test engineer is creating test cases for a traction control system (TCS) that reduces engine torque when wheel slip is detected. The TCS's torque reduction affects wheel slip. Which statement correctly describes how the choice of testing approach influences test case design?

Closed-loop testing is not suitable for TCS because it is a safety system.

Closed-loop testing requires defining a wheel-slip profile that is independent of the TCS's actions.

Both approaches require the same test cases because the TCS logic is the same.

Open-loop testing requires defining a wheel-slip profile that is independent of the TCS's actions.

Certified Tester Automotive Software Tester

Domain 3Objective 2

Differences Between Closed-Loop and Open-Loop CT-AUT Practice Questions (Page 4)

Part of the Testing in a virtual environment domain, which makes up ~27% of our current practice bank. ISTQB does not publish an official question count, but from its 60-minute exam (~25–40 total, ~7–11 in this domain), expect 1–2 from this objective — we provide 18 practice questions to prepare you well beyond it. (estimate)

18questions here

4free pages

7concepts

Questions 16–18

16application · medium
A test engineer needs to verify that a software module correctly parses a CAN signal and outputs a diagnostic trouble code (DTC) when the signal exceeds a threshold. The module's output does not influence the CAN signal. Which testing approach is most suitable, and what is a key benefit?
Select an answer first
17foundation · easy
Which of the following is an example of a closed-loop testing application?
Select an answer first
18application · medium
A test engineer is creating test cases for a traction control system (TCS) that reduces engine torque when wheel slip is detected. The TCS's torque reduction affects wheel slip. Which statement correctly describes how the choice of testing approach influences test case design?
Select an answer first

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Differences Between Closed-Loop and Open-Loop CT-AUT Practice Questions (Page 4)

Questions 16–18

A test engineer needs to verify that a software module correctly parses a CAN signal and outputs a diagnostic trouble code (DTC) when the signal exceeds a threshold. The module's output does not influence the CAN signal. Which testing approach is most suitable, and what is a key benefit?

Which of the following is an example of a closed-loop testing application?

A test engineer is creating test cases for a traction control system (TCS) that reduces engine torque when wheel slip is detected. The TCS's torque reduction affects wheel slip. Which statement correctly describes how the choice of testing approach influences test case design?

Keep studying — Testing in a virtual environment