ABs Pump Relay waveform

Capture a waveform that shows both the control circuit change when it turn on the relay and the power switching  on the power t ABS pump Use oscilloscope with two channel to capture this pattern. You May have to carefully set the trigger to capture this. record the waveform below with the time and volts per division

CH 1= 5V  per division and 1second per division
CH2= 5V per division  and 1 second per devision
Explain with what is happing in the waveform above.


The relay switches after 1 second. and then the pump motor revived 12 volts supply in the switching circuit, which activating the pump.The the pump turned off 1.2 seconds and slowly reduce the voltage.

Observe what happening during the ABS Self Test when you first turn the key on. Watch the warning lights and observe power at the wires with the oscilloscope. Then discuses what happening in the ABS system during the self test.


As i turned the key on the warning comes up therefore it is doing self test and goes off, when every thing is clear the system relay switch is closes and voltage pases to the Motor pump relay and power at the motor jump to 12V and then after a few seconds switched off. and voltage at pump goes back to 0V. The lamp goes off indicated that every thing is fire with the ABS.

Great a fault in the system by slowing down a wheel speed sensor or safely out an inductive wheel speed sensor while you are applying the brake . As you are applying the brakes notice if the ABS pump turn on solenoids turn on, or if the hydrolic pressure changes in one of the brake circuit and shows up on the pressure gage. Discuss what is happening below.

To make the rotor slow down in manually i had to create friction against the rotor. I hold the rotor tight so it does not move when turned on the mac hen then i released that the pump did not do self test till slowly release the brake  so the pump could do self test and goes up before locking the rotor.

Catch an oscilloscope pattern when an ABS solenoid has actuated. When is the pin and name of the solenoid   how did do it?
The solenoid wires are: 1 Blue,  3 Grey,  5 Green , and 7 yellow. The solenoid operates as the relay is operated.

Draw the oscilloscope pattern below. Note the time and voltage per division.