On Vehicle Testing

ABS WHEEL SPEED SENSORS

on the vehicle i was assigned to use, there was analogue wheel speed sensors, i found this out by checking how many wires it had, my sensors had two wires.

i could not measure the air gap of my sensors because the was a metal plate in the way and i did not have the time or resources to take it off.
i did however, do a visual inspection and the teeth on the gear looked intact and the sensor looked in good condition.

below is a wheel speed sensor that looks similar to the one that was on my vehicle:

http://www.instructables.com/id/Magnetic-speed-sensor/

i then recorded a waveform with an oscilloscope, this shows how the voltage goes up and down as the teeth on the gear pass by the magnetic pick up:

USING A SCAN TOOL

for this exercise i used a 1997 Mitsubishi Galant, this had OBD2.
i then hooked up the scan tool and brought up the live data screen for the ABS, the results are below:

Front right wheel speed sensor
rear left wheel speed sensor
front left wheel speed sensor
rear right wheel speed sensor
brake light switch

i then went to the actuation screen and activated a few inlet and outlet solenoids to make sure they were working.


ELECTRONIC TRANSMISSIONS AND SCAN TOOLS

PCM = powertrain control module
TCC = tourque converter clutch
TPS = throttle position sensor
ECT = engine coolant temp sensor
VSS = vehicle speed sensor
PSA = transmission range fluid pressure switch assembly
TTS = transmission temp sensor



sensors and actuators:

wiring diagram for the above inputs and outputs: