Mini Course 06 · Explore binary inputs, logic gates, and how simple electronic rules can turn sensor information into commands. Learn, build, test, then diagnose a decision circuit.
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Open each lesson, try its idea in the workbench, and mark it complete when you understand it.
Choose three binary inputs and connect two logic gates: first evaluate A and B, then combine that result with C. A 1 represents a true/high condition; 0 represents false/low. In real vehicles, signal voltage levels and active-low conventions depend on the circuit.
The highlighted row is your current input combination. A truth table lists all eight combinations of three binary inputs.
| A | B | C | Stage 1 | Output |
|---|
Teaching model: gates here operate on ideal Boolean states, not actual sensor voltage thresholds, software timing, network messages, or production ECU calibration.
Select an example to load its inputs and decision rule into the live workbench. Toggle the inputs to see how the output responds.
(Engine hot OR A/C request) AND ignition on
In the simplified fan control model, (hot OR A/C request) AND ignition on must be true to command the fan. A scan tool reports: engine hot = 1, A/C request = 0, ignition on = 1; fan command = 0.
First question: What should you conclude from these four reported values?
Safety: A real engine cooling fan can start unexpectedly. Follow OEM service procedures and keep clear of moving components. A logic-command problem is not the same as a fan power, motor, or relay problem.
Answer all five questions. A score of 4/5 or better completes the assessment; review explanations and retry as needed.
Finish the lessons, logic lab, vehicle lab, diagnostic challenge, and assessment to earn the completion badge.