Position sensors and plausibility
Throttle has two tracks and one disagrees by a tiny amount. Why does the ECU care?
What this lesson covers
CORE TEACHING Potentiometer/Hall position; redundant tracks; APP/TPS/EGR; inverse/parallel signals; plausibility safety. PRACTICAL DEMONSTRATIONS AND TESTS Graph pedal tracks together; slowly sweep control; check dropouts; meter/scope at connector. ADVANCED / SCAN TOOL LAYER Scope dual channels; scan graph; correlation calculations conceptually. KEY DIAGNOSTIC QUESTIONS Are both tracks smooth? Do they maintain expected relationship? Is fault mechanical or electrical? 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.
What you will be able to do
Throttle has two tracks and one disagrees by a tiny amount. Why does the ECU care?
Where it sits in the programme
- Builds on
- Lesson 24: Temperature sensors in real diagnosis
- Feeds into
- Lesson 26: Testing actuators: motors, solenoids and valves
More in Sensors & Signals
- 18Power, ground and signal — the universal sensor pattern
- 19Testing a three-wire sensor
- 20Two-wire temperature and resistive sensors
- 21Hall-effect cam and crank sensors
- 22Inductive sensors and AC signals
- 23Pressure sensors — MAP, rail and A/C
- 24Temperature sensors in real diagnosis
- 25Position sensors and plausibility
- 26Testing actuators: motors, solenoids and valves