abs 2nd half

On vehicle testing:
LIFTING & SUPPORTING VEHICLES
Student Name …………………………………………………
Date …………………………….
To safely lift and support a motor vehicle on a flat surface
Vehicle opel……………………………. Model vectra…………………………………
Ensure the floor surface is clean and flat
Apply the parking brake; slacken wheel nuts of wheels to be removed
Identify a safe vehicle chassis member to lift the vehicle using the jack
Lift the jack until it is touching the chassis member
Release the parking brake to allow the vehicle to roll while lifting
\recheck the location of the jack before lifting the wheels off the ground
Locate axle stands in a safe position on solid vehicle member
Have your tutor check before lowering the jack
Lower the jack slowly until the vehicle is supported by the stands
Tutor check …………………………………………………..
To safely lower the vehicle to the ground after being supported on axle stands:
Ensure all wheels and nuts are located before removing vehicle stands
Lower the vehicle gently to the floor
Apply parking brake
Torque and check wheel nut tightness
Have your tutor check the vehicle
20
On-Car Exercises
On the vehicle that you have been assigned identify the following components to your tutor:
Wheel speed sensor
ABS control unit
ABS modulator
ABS pump motor
Parking brake switch
Brake master cylinder
Brake fluid level switch (if fitted)
RPM sensor
Foot brake switch
Brake booster
Main ABS control unit fuse
Instructor OK? _X__
21
ABS Wheel Speed Sensors
On the vehicle that you have been assigned does it use analogue or digital wheel sensors?
_________analog wheel sensors
______________________________________________________________________
_______________________________________________________________________________
How did you conclude that the wheel sensors were analogue or digital?
__________________________________________________________________________because the scan tool gave us a analog wave form_____
_______________________________________________________________________________
_______________________________________________________________________________
Tutor signature ……………………….
Measure the air gap for each wheel sensor.
State the air gap and visual condition of each wheel sensor
Front Right
_____________0.152mm________________________________________________________________________
_____________________________________________________________________________________
Front Left
____________________0.152_________________________________________________________________
_____________________________________________________________________________________
Rear Right
_________________________cant get to the gap____________________________________________________________
_____________________________________________________________________________________
Rear Left
___________________________cant get to the gap__________________________________________________________
_____________________________________________________________________________________
22
Using an oscilloscope connect it to a wheel sensor and record the pattern shown, If the sensor is a
Analogue sensor then just connect then probe and spin the wheel. If the sensor is digital you will
need to have the ignition on before you turn the wheels. (show scale)
Is this pattern an analogue or digital pattern?
___analogue____________________________________________________________________________
_______________________________________________________________________________
Using the frequency scale on a multi-meter. Turn the wheel at proximally the same speed as in the
above test. Note the frequency and compare it to the graph you drew above.
Frequency__125.30 Hz _____________________________________________________________________
Observations
_______________________________________________________________________________
_______________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
23
Using a Scan Tool
Using a scan tool go to the ABS live data screen and note all the sensors, data and what it is telling
you
……LF Wheel speed sensor
RF wheel speed sensor ………………………………………………………………………………………..
………LR wheel speed sensor …………………………………………………………………………………………
RR wheel speed sensor. ………………………………………………………………………………………………
…Brake switch ………………………………………………………………………………………………..
3.FL hold sol. command ………………………………………………………………………………………………
…FL Hold sol. Feedback …………………………………………………………………………………………………
4.FL release sol command and feedback …………………………………………………………………………………………………
…FR hold sol. Command and feedback ………………………………………………………………………………………………….
5.FR release sol command and feedback …………………………………………………………………………………………………
…RL Release sol feedback and command ………………………………………………………………………………………………….
6.RL hold sol command and feedback …………………………………………………………………………………………………..
……………………………………………………………………………………………………..
7. RR hold sol command and feedback …………………………………………………………………………………………………...
…………………………………………………………………………………………………........
8 RR .Release sol command and feedback …………………………………………………………………………………………………...
……………………………………………………………………………………………………….
9. …………………………………………………………………………………………………...
……………………………………………………………………………………………………...
24
Using the scan tool on the vehicle you have been assigned to. Go to the actuator test screen.
Note below what component you have tested and what happened when you tested that component
and the test results.
1. ……………………………………………………………………………………………..
…………………………………………………………………………………………………
2. ……………………………………………………………………………………………..
…RF valve went on off on off ………………………………………………………………………………………………
3.LR out went on off ………………………………………………………………………………………………
…………………………………………………………………………………………………..
4. ………………………………………………………………………………………………
……………………………………………………………