Curriculum
Module 04intermediate
Sensors & Signals
Understand and test the power, ground and signal patterns behind automotive sensors and actuators.
Lessons
09
Estimated time
315 min
Completed
00/09
By the end of this module
Interpret live readings and waveforms, then prove whether the fault is wiring, input, control or output.
Lessons
9 total
- 18Power, ground and signal — the universal sensor patternScanner says a sensor is implausible. Before replacing it, what are the three things you prove?Members only35 min
- 19Testing a three-wire sensorFuel rail pressure code. Is the sensor wrong, is its 5 V missing, or is the signal wire lying?Members only35 min
- 20Two-wire temperature and resistive sensorsCoolant temperature reads -40°C on a warm engine. Why does an open circuit often create an extreme value?Members only35 min
- 21Hall-effect cam and crank sensorsEngine cranks but ECU reports no synchronisation. Does the cam/crank sensor actually switch?Members only35 min
- 22Inductive sensors and AC signalsTwo-wire crank or wheel-speed sensor has no 5 V feed. Is that automatically wrong?Members only35 min
- 23Pressure sensors — MAP, rail and A/CA pressure sensor reads something believable but wrong enough to ruin the diagnosis.Members only35 min
- 24Temperature sensors in real diagnosisCold engine shows 86°C before it has even started.Members only35 min
- 25Position sensors and plausibilityThrottle has two tracks and one disagrees by a tiny amount. Why does the ECU care?Members only35 min
- 26Testing actuators: motors, solenoids and valvesECU commands a component ON, but nothing moves. Is the ECU bad, the wiring bad, or the actuator dead?Members only35 min