Download EMS Professor - AE Tools & Computers

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Opto-isolator wikipedia, lookup

Pulse-width modulation wikipedia, lookup

Islanding wikipedia, lookup

Heterodyne wikipedia, lookup

Ground loop (electricity) wikipedia, lookup

Ignition system wikipedia, lookup

Dynamic range compression wikipedia, lookup

Spectral density wikipedia, lookup

Transcript
Carman scanFor EMS PROfesor
1.11.3 Vehicle Speed Sensor Trouble type and Analysis
Malfunction of Vehicle speed sensor
Trouble
1. Any vehicle speed sensor signal is not detected with driving.
2. Vehicle speed is much higher than actual speed. (Too much signal noise)
3. Even though vehicle stop, ECU identify vehicle speed.
Cause of
trouble
Engine
state
1. Wiring circuit failure (Signal or Ground line open or shorted)
or vehicle sensor malfunction
2. Too much signal noise detection in vehicle speed sensor
1. Engine RPM is slightly high in idle state and it is oscillating.
2. In case of A/T vehicle, shift point is high gear position and it is shifted with 2 or 3 gear
when take off.
Normal
signal
Signal
wave when
trouble
detection
Vehicle speed signal should be detected in driving.
It should be always constant at vehicle stop.
1. always constant
2. Noise detection in VS signal
52