Hall-effect cam and crank sensors

CORE TEACHING Hall effect; supply/ground/signal; digital high-low switching; tooth/target wheel; frequency; correlation basics. PRACTICAL DEMONSTRATIONS AND TESTS Check supply/ground; meter frequency where supported; scope square wave while cranking; compare cam/crank. ADVANCED / SCAN TOOL LAYER Oscilloscope is central here: good waveform, missing pulse, low amplitude, interference; dual-channel cam/crank correlation. KEY DIAGNOSTIC QUESTIONS Is sensor powered? Does it switch? Is pattern clean? Do cam and crank agree mechanically? MUST-COVER CHECKPOINTS Identify sensor technology; supply/ground if applicable; expected signal type; physical stimulus; scan comparison; scope if time-varying; wiring-to-ECU proof.

Engine cranks but ECU reports no synchronisation. Does the cam/crank sensor actually switch?

Builds on

Lesson 20: Two-wire temperature and resistive sensors

Feeds into

Lesson 22: Inductive sensors and AC signals

1. 18Power, ground and signal — the universal sensor pattern
2. 19Testing a three-wire sensor
3. 20Two-wire temperature and resistive sensors
4. 21Hall-effect cam and crank sensors
5. 22Inductive sensors and AC signals
6. 23Pressure sensors — MAP, rail and A/C
7. 24Temperature sensors in real diagnosis
8. 25Position sensors and plausibility
9. 26Testing actuators: motors, solenoids and valves