Doing the dual pattern works the same as doing the normal one but you just get two paterns.I still used the same oscilloscope but but went to menu and turned patern b on this makes it posible to see two patterns.hooking it up was not hard.I used one earth that went in the bat- terminal on the 1zz engine and then I had two red wires in two diferent terminals of the osciliscope then I put them in the terminals of the sensors patern that i wanted.When i got goo paterns I pased them and got the result.This can also be done with two oscilloscopes if needed.
The first pattern I got was map against injectors.The voltage for the map was 1v and voltage for injectors was 20v.For this one I used two oscilliscopes.The reason for this was because the map is alot slower than the injectors so I couldnt realy get a good reading for them together.So I used two earhts and started them same time and paused them at the same time aswell to get a good afective pattern
The left side is the injector and on the right hand side is the map.on injectors bottom line is burntime and goin up is charging and on the map as it goes up its getting more air.The two components relate to eachother because.When the map sensor goes up it means it is getting more air.This means the injector will spray more fuel because the ECU can see there is more air so there has to be more fuel.There is also more frequency at the injector when there is more air.the higher the map signal is the bigger the burntime of the injector would be because when it goes higher it gets more air so it needs more fuel.The components affect eachoter because if the map is faulty the air reading might be wrong so it wont spray right amount of fuel and it would make the car run badly.
The next pattern I did was for rpm crank vs injector.For this one I used one iscilloscope because it was all i needed.The voltage for the rpm crank was 10v and the voltage for the injector was 50v.When I first did this it did not work then I realized the crank sensor was not connected so I moved to another engine.
The bottom pattern is the rpm and the top patern is the injector.I had the time on 2ms.in the injectors were it goes doen between that and before it goes up again is burntime.with the rpm top is peak point.If I ad throttle the gaps between waves of rpm wil opn more.These components relate to eachother because as soon as the crank meets the o point the injector switches on.The slower the time which was 2ms in this time the bigger the burntime of the injector.This means that the components can affect eachother in a big way because if the crank sensor is faulty the injectors wont turn on when it should and cause the car to run badly.
The next pattern was for oxygen sensor against injectors.I did this one on a 4a-fe engine.
I had the oxygen sensor voltage on two volts and the injector voltage on 10v and the time on 5ms.the injector stil same. the oxygen sensor does not do much because the o2 sensor not as fast as injecor.These components relate to eachother because the oxygen sensor measures the gases and sends to ecu and makes injectors spray more or less.If there is a faulty O2 sensor the injectors might spray too much or too little fuel.this would cause the car to run lean or rich and could cause it to use more fuel.
The next pattern I did was for ignition primari against injectors.
I had the voltage of the injectors on 20v and the ignition on 5v with the time on 5ms.In this pattern the two wave forms are directly above eachother like the burntime of the injector is even with the ignitions time.when we rev the car the ignition goes up aswell as the injector pattern.these relate to each other because when ignition goes up injector sprays.This means if the ignition faulty the burntime of the injector will be wrong and the car will run badly might also run rich and use more fuel.
The last patern I did was ignition primary voltage against ignition primary current
The current rises as the primary circuit is completed as it show in this pattern the top one is the current and the bottom is the voltage of the primary ignition.I used a ohmmeter that i hoocked up with the oscilloscope to get the current pattern.
on your first pattern the injector V map injectors do not have burn time or changing up that is a coil.
ReplyDeletethe low part on the pattern is on time the peak is back EMF from the injector closing.also a map looks at pressure which can relate to air
What happening in your second pattern explain?
On pattern 4 the open time for the injector will lengthen as the engine revs up, the low part of the ignition called dwell time might increase but depends wither it has dwell extension if not it wont
on pattern 5 what is the relation between these two patterns?