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Video Petrol Injection 1
Video Petrol Injection 2
Video Petrol Injection 3
Video Petrol Injection 4
Video Petrol Injection 5
Video B-Dir. Combustion
Video Dir. Petrol Injection 1
Video Dir. Petrol Injection 2
Video Dir. Petrol Injection 3
Video Dir. Petrol Injection 4
Video Dir. Petrol Injection 5
Video Petrol Injection Kugelf.
Video Homog. Working
Video Stratified-charge Oper.
Video Fuel Distrib.
Video Induction System
Video Petrol Injection Signal 1
Video Petrol Injection Signal 2
Video Idle Speed Device
Video Mass Air Flow Sensor 1
Video Mass Air Flow Sensor 2
Video Mass Air Flow Sensor 3
Video System Press. Reg. 1
Video System Press. Reg. 2
Video Injection Valve
Video Ind. Pulse Generator
Video Single Point Injection 1
Video Single Point Injection 2
Video Single Point Injection 3
Video Single Point Injection 4
Video Unregistrated Air
Video Lambda Sensor 1
Video Lambda Sensor 2
Video Lambda Sensor 3
Video Lambda Sensor 4
Video Lambda Sensor 5
Video Thermo Time Switch
Video Side-channel Pump
Video Peripheral Pump

Video First Fuel Pump
Video Petrol Injection Pump
Video D-Jetronic (MPI)
Video K-jetronic
Video KE-jetronic
Video KE-Jetroncic - Test, Diagn.
Video L-jetronic
Video LE-jetronic
Video LE-motronic
Video LH-jetronic
Video Vol. Air Flow Sensor
Video Idle Speed Device
Video Aux. Air Valve
Video Thermo Time Switch
Video Roller Vane Pump

Video Petrol injection 1
Video Petrol injection 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Petrol Injection Signal
    (additional information)


Data derived from the oscilloscope may sometimes cause confusion, particularly if you do not take the zero line into account. Thus it is possible to manipulate two diagrammes of different measurements by various settings in such a way that they correspond to one other. If you are working with an oscilloscope, one that is also used by electronic engineers, one signal can be deducted from another signal by 'Inverting' or changing poles and shifting in Y direction.

How it works

The data above stem from two different injection signals. If you want to find out how such a signal looks like in a wider context, please click here.

How do these signals come about? The figures 2 and 4 display the corresponding circuit. The signal shown in figure 1 develops from the voltage drop between the measures of the ground rated output of the control device to the injector and terminal 15 (12 V). Figure 3 develops by connecting instead of terminal 15 ground to the multimeter.You do not need to argue which signal is correct, because this is valid for both. The indicated injection pulse timing is the same in both cases. The question would rather be which signal is more common in the workplace practise. This question is also unambiguously. The signal displayed in figure 1 can be received at both connections of an injector. But there are a lot of testers (e.g., Gutmann) which can display the signal only in the form of figure 2. This signal also dominates in the technical literature. You may not act as described above, making adjustments in such a way as if you would have measured at another place.Of course the signal can only be gained in this form if you do not disconnect the respective injector.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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