- spiked by careless wlding i.e MIG welding without disconnecting the battery is true
- Encolsure seal damaged wid obvious sign of water ingress is true
- Obvious signs of mechanical damage to the encolsure is false
- Faults are more likely to be connections or sensors is true
You culd use the scan tool and have a look to see if there a diagnostic trouble code
Using ocillocpe or muiltmeter to test all the wheel speed sensors and do all the test that needed to be. Check all the connections expecially connnections to the ECU and check wiring for damage.
Components of the ABS wiring and operations
- 1 disc
- wheel speed sensors
- Rotor
- HCU/ ECu
- master cylinder
- Calliper /wheel cylinder
- booster
Front right: white and black
Front left: green and red
Rear left : blue and pink
Rear right :yellow and brown
the reasons for braded wire: because it has anti interence and doesnt make the ECU confuse and stop the electrical going out
There 5 fuses in the ciurit
- main fuse
- gauge fuse
- dome fuse
- stop fuse
- ECU
ABS Motor pin number is 1A
ABS control unti pin number is 10B and 7B
Wheel cylinders
Font right wheel
pin number 3B And 7B . wire colour Red and white + red and green
Front Left wheel
pin number .3B and 7B Wire colour blue and red +black and white
Rear Left Wheel
pin number 4b and 8b wire colour geen and black + green and yellow
Rear Right Wheel
pin number 1b and 5b wire colour brown and white + brown and red
The conditon of the inlet and outlet solsnoid valves under normal braking
the wrong answer is inlet valve closed - outlet valve open
The condition of the inlet and outlet solenoid valves when the ABS is operating to reduce wheel break pressure
the right answer is inlet valve closed - out let valve open
The condition of the inlet and outlet solenods valves when the ABS is operating to hold brake pressure
the correct was one the inlet valve closed - outlet valve closed
Condtion of the inlet and outlet sensoids valves when the ABS is operating to increase wheel breake pressure.
the wrong answer is inlet valvve closed - out valve open
The ABS motor wil be workingthis a graph of the digital singal with 5 volts and every 2 seconds
Sorry sir i forgot to add the time for the second and the top it on and botom line is off.
so when the brake fluid goes through the outllet vlave it fills with resvoir and then the motor is used to operate like working as the pump pushing the fliud back to the chamber and into the brake tube lines from the master cylinder.
This a picture of the analogue signals wid a freuecny of 0.5HZ
ABS Demonstrators
Left Front ECU Pin 4 and 5
Left Rear ECU Pin 7 and 9
Right Front ECU Pin 11 and 21
Right Rear ECu Pin 24 and 26
the type of the speed sensor is Inductive
ABS speed sensors check the rotation of each tire, making sure that each wheel is rotating properly and working well. Any slippage or difference between the wheels triggers the ABS system.
Using a Ocillosope is a Tektronix type
Record a waveform for weheel speed sensors.
The all four wheel speeds sensors very same to me but nothing diffent pattern when testin the other 3 speed sensors. Because all 4 wheel is same and the air gap as well so they al of them are the same. The times period is the same on all these warforms bt the voltages varys and this can be the air betweeen the sensors and reduvtor so when the gap is smaller the voltage would be lower.Measuring AC volts wid a multi-meter
Left Front 3.2v
Left Rear 2.7v
Right front 4.1v
Right Rear 2.9v
P/c x .707 =RMS
3.2/ .7097 =4
be as accurtate in finding with the wheel speed sensors is NO
well it bit strange all the wheel speed sensor voltages are differnt and i dont think that is not normal. could be some faults or maybe depend how mch pressure like pushin the brake down and put the somthing on the teeth and press it and find the readings well my view if there are a couple of teeth missing on the gear the mulitermter would nt really show and the oscillaope wil ahve a change in time.
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