Integrated Circuits &
Automotive Electronic Control Modules
Mini Course 05 · Explore how sensors, signal conditioning, microcontrollers, software decisions, and power drivers work together inside a simplified automotive ECU.
From an input signal to a working system
A module does not “know” engine temperature by magic. A sensor changes an electrical signal, interface circuitry prepares that signal, a microcontroller interprets it, and an output driver controls a load. In this lab, you will operate a simulated cooling-fan control system and track each stage.
Resistance → sensor voltage
Read, validate, decide
Switch current to ground
10 short lessons
Inputs, logic, embedded software, power supplies, drivers, protection, networks and diagnosis.
3 interactive stations
Control the ECU, view its signals, and diagnose faults using simulated readings.
8-question check
Test your reasoning. Earn completion when the lessons, labs and quiz are finished.
Teaching model: an illustrative, simplified low-side fan-driver circuit. Actual vehicle designs, thresholds, sensor characteristics, fail-safe responses and test specifications vary. Follow manufacturer service information on real vehicles.
Guided lessons
0 / 10 readOpen each lesson, explore the concept, and mark it complete. Your progress is retained on this device.
Virtual ECU workbench
COOLING FAN CONTROLChange an input, follow the decision, and compare the ECU command with the actual electrical output.
Inputs & conditions
Live circuit map
*Averaged idealized electrical model, not a vehicle-specific fan characteristic or a validated physical fault simulator.
Module decision trace
The simulated ECU requests 100% fan above 98 °C, releases thermal demand below 92 °C, and requests 65% for A/C. An implausible ECT signal commands 100% as this example's fail-safe. The 92–98 °C gap represents hysteresis. PWM is modeled as ideal ON/OFF switching; the fan’s rotational inertia and real driver diagnostics are not modeled.
Signal explorer
Observe what the sensor and ECU can measure versus what the power driver actually does. The traces are conceptual, not oscilloscope-accurate.
1 · Sensor voltage and digitization
A 10-bit analog-to-digital converter maps an input between 0 and 5 V to integer counts from 0 to 1023. ADC resolution does not guarantee measurement accuracy.
2 · ECU PWM command
— commanded duty · —
A low-side MOSFET driver switches a fan's ground path. The logic PWM trace shows the *requested* command. An open output driver can leave the command waveform intact while fan current stays at zero.
3 · Diagnose the difference between command and response
Change the ECU lab inputs, then return here to compare the sensor voltage, command duty cycle and fan current.
The Challenger's diagnostic bay
Five no-fan and sensor-fault cases. Review the evidence, choose the fault, and learn which measurement separates a command problem from a power or load problem.
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These are simulated values and deliberately simplified faults. In actual diagnosis, verify circuit design and measurements against the service manual before condemning a module or component.
Final knowledge check
Select an answer for each question. A score of at least 7/8, all 10 lessons and the two simulation labs plus five diagnostic cases complete this prototype course.