|
|
| Re: Coupe Sports Sedan |
Subject: Re: Coupe Sports Sedan
by SaCoupe73 on 2016/4/16 12:53:35
Earths all good. . . . .
The type of ECU I am using "sinks" the voltage to / from sensors
and the injectors so earthing the ECU is very important, all checked OK.
What I mean by sink is.
I will use the fuel injectors as an example.
There are two wires to each injector. One wire is connected
to the battery supply when the ignition is turned on.
The other wire is connected to the ECU.
The transistor in the ECU will, when required allow the power to flow
through the injector, through the transistor to earth, the frame of the
car and back to the battery negative.
Every second time engine rotates the injector is energised for a very short
period of time to supply a dose of fuel to be burnt.
The voltage applied is always 12v (battery voltage) but because it is pulsed the
average voltage seen by a volt meter will be less than 12 volt.
The higher the injector duty cycle and the higher the engine RPM is the higher
the average voltage will be.
This voltage can be measured whilst the engine is cranking
to see if the injectors are being fired.
In this case about 7.5 volts.
Earths all good.
Any other Ideas ? ? ? ?
|
|
