20/08/2026 10:54 am
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Automotive Q&A
What makes a post-repair road test an acceptance test instead of a quick drive?
Review the evidence, add a focused answer, and distinguish confirmed measurements from assumptions.
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“Road tested OK” does not say whether the original hill, temperature or speed was reproduced. We want acceptance criteria tied to the initial failure evidence.
How do you define the route and pass conditions?
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21/08/2026 6:12 am
Write the original trigger in measurable terms, then build a safe route that reaches the same load, speed, temperature and duration. Identify the channels that failed before repair and their expected limits afterward. Include a normal comparison when possible. For an underboost case, that might be commanded versus actual pressure, wastegate duty and time under load on the same hill.
A pass requires the symptom absent and the supporting data normal through the trigger, not merely no warning lamp. Record distance, conditions and any monitor that still needs a customer drive.
Topic starter
22/08/2026 7:23 am
Our new acceptance line reused the pre-repair graph template. A cooling-fan repair passed a bay idle but failed the defined uphill A/C condition, revealing a second weak fan relay before delivery. The final test then met every criterion.